5. A car is traveling at 20 0 m/s when the driver sees a child standing in the road. The
driver takes8 s to react, then steps on the brakes and slows at 5.0 ms. Once the
brakes are pressed, the car stops in an additional 4 seconds. How far does the car
travel before it stops from when the driver sees the child?
Help please !!
Answers
We know that
• The initial velocity is 20 m/s.
,• The acceleration is -5 m/s^2.
,• The final velocity is zero because it stops.
,• The time spent to stop is 4 seconds.
Let's use the following formula.
\(v^2_f=v^2_0+2ad\)Using the given magnitudes, we have
\(0=20^2+2(-5)d\)Let's solve for d.
\(\begin{gathered} 0=400-10d \\ -400=-10d \\ d=\frac{-400}{-10} \\ d=40m \end{gathered}\)Therefore, the car stops 40 meters away after stepping on the brakes.Related Questions
Select the correct answer. What is the number of protons in this carbon atom? A. 12 B. 6 C. 18 D. 24 Reset
Answers
Answer:
6 protons
Explanation:
\(p = e = n = 6 \\ 6 protons, \\ 6 neutrons, \\ and 6 electrons\)
The gravitational force between two objects is 50N. If the mass of one object is quadrupled and the distance is doubles, what is the new force?
Answers
If the mass of one object is quadrupled and the distance is doubled, the new gravitational force will be the same or equal to 50 N.
What is gravitational force?The gravitational force can be thought of as an attracting force that pulls all mass-containing physical objects toward it. It is by far the least powerful known natural force.
The gravitational force, F, of attraction between two objects, is given mathematically as follows:
F = GM₁M₂/r²
where;
G is the gravitational force constant
M₁ is the first mass
M₂is the second mass
r is the distance of separation
Given that the gravitational force between two objects is 50N.
If the mass of one object is quadrupled and the distance is doubled, the new force will be:
F = 4 * GM₁M₂/(2r)²
F = GM₁M₂/r²
Hence, the force remains the same.
Learn more about gravitational force at: https://brainly.com/question/24783651
#SPJ1
An average force of magnitude 300 N exerted to compress a spring by 20 cm compute the work done by the force
Answers
Answer: 60 Joules (J)
Explanation:
To compute the work done by a force, you can use the formula:
Work = Force × Distance × cosθ
In this case, the force applied is 300 N, and the distance is 20 cm (which can be converted to meters by dividing by 100, giving us 0.20 m).
The angle θ represents the angle between the direction of the force and the direction of displacement. Since the force is used to compress the spring, the displacement is in the same direction as the force, and the angle θ is 0 degrees. The cosine of 0 degrees is 1, so we can omit the cosine term.
Now we can calculate the work done:
Work = 300 N × 0.20 m
Work = 60 Joules (J)
Therefore, the work done by the force in compressing the spring is 60 Joules (J).
WHAT IS IN THE SPACE RACE
Answers
Answer:
The Space Race was a competition between the United States and the Soviet Union during the Cold War era to explore space and achieve various milestones in space exploration. The Space Race was focused on sending humans and unmanned spacecraft into space, as well as achieving significant scientific and technological advancements related to space exploration.
Explanation:
Some of the significant milestones achieved during the Space Race include:
The launch of the first artificial satellite, Sputnik 1, by the Soviet Union in 1957
The first manned spaceflight by Soviet cosmonaut Yuri Gagarin in 1961
The first American manned spaceflight by astronaut Alan Shepard in 1961
The first American to orbit the Earth, John Glenn, in 1962
The first spacewalk by Soviet cosmonaut Alexei Leonov in 1965
The first lunar landing by the United States with the Apollo 11 mission in 1969
The Space Race was a significant achievement in human history, and it led to many technological advancements that have continued to impact society today.
HI PLEASE HELP ON QUESTION ASAP USING AVERAGE (MEAN) TO ANSWER QUESTION! IF UR ANSWER AND EXPLAINATION IS CORRECT ILL RATE YOU FIVE STARS, A THANKS AND MAYBE EVEN BRAINLIEST. PLEASE MAKE SURE YOU ANSWER MY QUESTION USING AVERAGES.
1) a meal for 6 cost £12 per person. as it is one of the diners birthday , the other 5 decided to pay for his meal. how much do each of the five friends need to pay?
Answers
Each of the five friends needs to pay £12 to cover the cost of their own meals and contribute towards the birthday person's meal. Using mean allows us to distribute the cost equally among the friends, ensuring a fair division of expenses for the meal.
To determine how much each of the five friends needs to pay, we can use the concept of averages (mean) and divide the total cost by the number of people paying.
In this scenario, the total cost of the meal for 6 people is £12 per person. Since the other 5 friends have decided to pay for the birthday person's meal, they will collectively cover the cost of their own meals plus the birthday person's meal.
To calculate the total cost covered by the five friends, we can subtract the cost of one person's meal (since the birthday person's meal is being paid by the group) from the total cost. The cost of one person's meal is £12.
Total cost covered by the five friends = Total cost - Cost of one person's meal
= (£12 x 6) - £12
= £72 - £12
= £60
Now, to find out how much each of the five friends needs to pay, we divide the total cost covered by the five friends (£60) by the number of friends (5).
Amount each friend needs to pay = Total cost covered by the five friends / Number of friends
= £60 / 5
= £12
For more such information on: mean
https://brainly.com/question/1136789
#SPJ8
In hiking, what fitness component is required of you
Answers
suppose a car of 1200kg is moving with a velocity of 40km/hr therefore its kinetic energy is not zero. 1. explain briefly what happens to its kinetic energy when the driver applies the breaks and the car stops
Answers
Answer:
Explanation:
For starters begin with a warning not to touch the brake drums. All of the KE is transferred to the brake drums. The result is a large rise in temperature. Heat. If you press hard on the brakes, rubber is left on the road and there is heat involved in that too.
Answer:
KInetic energy reduces.
Explanation:
Application of breaks reduces velocity. Reduction of velocity constitutes velocity reduction.
For more help contact +1 (304) 223-3136
A boat on a river is moving with a steady speed. The engine is running.
What would happen if the engine was turned off?
Answers
If the engine of a boat on a river is turned off while the boat is moving with a steady speed, several things would happen Loss of propulsion,Drifting,Loss of steering control and Potential hazards.
Loss of propulsion: Without the engine running, the boat would lose its power source for propulsion. The boat would gradually slow down and eventually come to a stop unless other external forces, such as currents or wind, continue to move it.
Drifting: Once the boat comes to a stop, it would start to drift with the current of the river or be affected by wind forces. The direction and speed of the drift would depend on the strength and direction of the current or wind.
Loss of steering control: When the engine is turned off, the boat's steering mechanism, such as a rudder, would also lose power. Without the ability to steer, the boat would follow the course determined by the river's current or the wind direction.
Potential hazards: Depending on the surroundings and the current conditions, there could be potential hazards for a boat that is no longer under power. These hazards might include other vessels, obstacles, shallow areas, or strong currents. The boat's crew would need to take appropriate actions to ensure the safety of the boat and its occupants.
It's important to note that the specific behavior of the boat after the engine is turned off can vary depending on factors such as the size and design of the boat, the strength and direction of the current, and the presence of wind or other external forces.
For more such questions on Loss of propulsion,click on:
https://brainly.com/question/17083942
#SPJ11
In an attempt to deliver a parcel on time, the dispatch rider had to ride 10km 15 degrees SE, he then rode 11 km 30 degrees NE and then takes a shortcut at 22km W .find the rider's displacement
Answers
The total displacement of the dispatch rider is calculated as 43km.
Data;
10km 15 degrees SE11km 30 degrees NE22km WTotal DisplacementTo calculate the total displacement of the dispatch rider, we can simply add up the total distance covered by the rider.
This becomes;
\(10+11+22 = 43km\)
The total displacement of the dispatch rider is calculated as 43km.
Learn more on displacement here;
https://brainly.com/question/13416288
https://brainly.com/question/1397750
TIME REMAINING
45:43
What are possible units for impulse? Check all that apply.
kg • m
kg • meters per second
N • s
N • m
StartFraction Newtons times meters per second EndFraction
Answers
Answer:
n.m maby
Explanation:
i think or its kg m/s
Answer:
answer (B) & (C)
Explanation:
kg • /N • s
The decibel rules of thumb can be combined. (a) If a sound has intensity xdB, how many dB does a sound 100 times more intense have? (b) If another sound has intensity ydB, how many dB does a sound 4 times less intense have? (c) Combine what you know about (a) and (b): If a sound has intensity zdB, how many dB does a sound 25 times more intense have?
Answers
The acceleration of positive performing SHM is 12cm/sec at distance of 3cm from the mean position its time period is?
Answers
The angular acceleration of the object can be obtained from the solution as 432 cm^2/sec from the mean position.
What is the simple harmonic motion?
We know that the simple harmonic motion is the kind of motion that the acceleration of the motion is such that the motion is directed towards the center of the motion. The implication of this is that the motion of the object would always tend towards the center of the motion of the object.
Then we would have to apply the formula that involves the angular velocity and the distance that is covered and thus we have to write the formula as follows;
α = ω^2y
α = acceleration
ω = angular velocity
y = distance covered
Then we have;
α = (12)^2 * 3
= 432 cm^2/sec
Thus the acceleration directed to the center is 432 cm^2/sec.
Learn more about acceleration:https://brainly.com/question/12550364
#SPJ1
4:01HOMEWORKThe parallel plates of a vacuum capacitor are 5mm apart and have 2m ^ 2 in area. A potential difference of 10,000 V (10.0 kV) is applied across the capacitor. Calculate a) the capacitance, b) the charge on each plate, and c) the magnitude of the electric field in the space between them.
Answers
RESPUESTA
a) C = 3.54 x 10⁻⁹ F = 3.54 nF
b) Q = 35.4 x 10⁻⁶ C = 35.4 μC
c) E = 2,000,000 V/m
EXPLICACIÓN
a) La capacitancia de un capacitor de placas paralelas se define como la razón entre la magnitud de la cantidad de carga en cada placa y la diferencia de potencial aplicado. A su vez, ésta depende de la geometría del capacitor. La ecuación que la define es:
\(C=\epsilon_0\cdot\frac{A}{d}\)donde C es la capacitancia, A es el área de las placas y d es la distancia que separa las placas. Además ε0 es la permitividad del vacío. En general la fórmula también incluye la permitividad relativa del material dielétrico (el material entre las placas del capacitor) pero en este problema no nos interesa, dado que el material entre las placas de este capacitor es el vacío.
De esta manera, si reemplazamos los datos de este problema:
• ε0 = 8.85 x 10⁻¹² F/m
,• A = 2 m²
,• d = 5 mm
Nota que tanto la permitividad como el área de las placas tienen unidades de metros, pero la distancia de separación entre placas está en milímetros, por lo tanto debemos convertirla a metros:
\(d=5\operatorname{mm}=0.005m\)Ahora sí, reemplazamos en la ecuación de arriba y obtenemos la capacitancia:
\(C=8.85\cdot10^{-12}\frac{F}{m}\cdot\frac{2m^2}{0.005m}=3.54\cdot10^{-9}F\)Cuando escribimos una cantidad en notación científica, y el exponente del 10 es -9 podemos no escribir esta parte y usar el prefijo nano. De esta manera, decimos que la capacitancia es de 3.54 nF.
b) La carga de las placas podemos obtenerla de la otra ecuación para definir la capacitancia:
\(C=\frac{Q}{V}\)C es la capacitancia que encontramos en el punto a), V es la diferencia de potencial aplicada y Q lo que estamos buscando, la carga de las placas. Del enunciado, tenemos que la diferencia de potencial es V = 10,000V. Reemplazando y resolviendo para Q:
\(\begin{gathered} 3.54\times10^{-9}F=\frac{Q}{10,000V} \\ Q=3.54\times10^{-9}F\cdot10,000V \\ Q=3.54\times10^{-5}C \end{gathered}\)Si movemos el punto decimal un lugar hacia la derecha tenemos: 35.4 x 10⁻⁶ C, que puede llevar el prefijo de micro. Para el prefijo micro usamos la letra griega mu (μ). Entonces la carga de las placas es 35.4 μC
c) Finalmente, para encontrar la magnitud del campo eléctrico, utilizaremos la relación entre la diferencia de potencial y la distancia entre las placas:
\(E=\frac{V}{d}\)Reemplazando con V = 10,000V y d = 0.005m, el campo eléctrico es:
\(E=\frac{10,000V}{0.005m}=2,000,000\frac{V}{m}\)The road runner was being chased and outsmart the coyote. He ran past the road runner an fell straight down off a cliff. He fell with the same acceleration as gravity (9.8). Calculate his displacement if he fell for 4 seconds
Answers
The displacement of the runner after four seconds is 78.4 m.
What is the displacement after 4 seconds?We know that in this case, we are dealing with a case of an object that has a motion under gravity. We are told that the road runner an fell straight down off a cliff. The fact that we have been told that the runner just fell down the cliff means that the initial velocity of the runner would have to be taken in this context as zero since the runner was dropped from a height as shown.
Acceleration of the runner (g) = 9.8 m/s^2
Initial velocity of the runner (u) = 0 m/s
Time take (t) = 4 seconds
We then have;
h = ut + 1/2gt^2
If we then know that the initial velocity of the person is zero, then we have;
h = 1/2gt^2
h = 0.5 * 9.8 * (4)^2
h = 78.4 m
The height is 78.4 m.
Learn more about acceleration:https://brainly.com/question/12550364
#SPJ1
What does it mean when work is positive?
Answers
Answer:
When force and displacement are in the same direction, the work performed on an object is said to be positive work. Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.
Explanation:
Hope this helps you
When force and displacement are in the same direction, the work performed on an object is said to be positive work. Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work
So yeah basically what the person above me said
Anorexia nervosa is generally a problem found in young girls.
True
False
Answers
Answer:
true
Explanation:
depends on how young it starts usually at age 10 or 12 sometimes 13 are the most common ages to start this
Can someone tell me a very very simple physics experiment topic that links to biology?
Answers
Explanation:
One idea would be to investigate the correlation between your pulse pressure and your pulse rate. To do this, you'll need a blood pressure monitor.
First, measure your resting pressure and rate. Then exercise for 30 seconds. Measure your new blood pressure and pulse rate. Wait for your pressure and rate to return to normal, then repeat the trial for 1 minute, 1.5 minutes, 2 minutes, etc.
List the results in a table. This should include the amount of exercise time, your pulse rate, your systolic pressure (the high number, which is your blood pressure during contraction of your heart muscle), and your diastolic pressure (the low number, which is your blood pressure between heartbeats). Calculate your pulse pressure (systolic minus diastolic) for each trial. Graph the pulse pressure on the x-axis, and your pulse rate (beats per minute) on the y-axis.
What do you hypothesize will be the shape of the graph? Consider Bernoulli's formula, which relates fluid pressure and flow. How close do the results match your hypothesis? What might explain any differences?
i didnt want my question public i made a mistake i want it taken down
Answers
A bike accelerates from 0 m/s to 15 m/s over the span of 5 seconds. How fast is the bike
traveling after 2.5 seconds?
Answers
The bike is travelling at 22.5 m/s after 2.5 s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the acceleration Initial velocity (u) = 0 m/sFinal velocity (v) = 15 m/sTime (t) = 5 sAcceleration (a) =?a = (v – u) / t
a = (15 – 0) / 5
a = 3 m/s²
How to determine the final velocity in the first 2.5 s Initial velocity (u) = 15 m/sAcceleration (a) = 3 m/s²Time (t) = 2.5 s Final velocity (v) = ?a = (v – u) / t
3 = (v – 15) / 2.5
Cross multiply
v – 15 = 3 × 2.5
v – 15 = 7.5
Collect like terms
v = 7.5 + 15
v = 22.5 m/s
Learn more about acceleration:
https://brainly.com/question/491732
#SPJ1
In contact forces, _____.
A.) objects do not touch each other
B.) objects must touch each other
C.) more work is done than in other forces
Answers
Explanation:
Answer:
B is the best answer for this
A boat sails for 24 km pointed in the direction [40° S of WI. A constant current moves the boat 8 km [30° W of N]. If the trip takes 3 hours, find the boats resultant velocity
Please brainliest, really need it!!!
Answers
The resultant velocity of the boat is 7.5 km/h.
What is the resultant displacement of the boat?The resultant displacement of the boat is calculated as follows;
Sum of the vertical displacement of the boat is calculated as;
∑Fy = -24 km sin(50) + 8 km sin(60)
∑Fy = -11.5 km
Sum of the horizontal displacement of the boat is calculated as;
∑Fx = -24 km cos(50) - 8 km cos(60)
∑Fx = -19.4 km
The resultant displacement is calculated as follows;
d = √ (-11.5² + 19.4²)
d = 22.55 km
The resultant velocity of the boat is calculated as follows;
v = ( 22.55 km ) / ( 3 hrs )
v = 7.5 km/h
Learn more about resultant velocity here: https://brainly.com/question/24767211
#SPJ1
Which planetary property has the greatest influence on the width of the light curve of a transiting planet
Answers
Radius of the planet has the greatest influence on the width of the light curve of a transiting planet.
What is radius?"Radius is a straight line from the centre to the circumference of a circle or sphere."
What is planet?"Planets are the largest objects in the solar system after the Sun."
What is light curve?"A light curve is a graph of light intensity of a celestial object or region, as a function of time."
What is transiting planet?"A transit occurs when a planet passes between a star and its observer."
According to Kepler, size of the planet is proportional to how much light is blocked . Hence , more deeper the transits are , more the size of the planet will be. This implies radius has the greatest influence on the width of the light curve of a transiting planet.
To learn more about transiting planet here
https://brainly.com/question/13489625
#SPJ2
Based on the diagram, what is the difference in how economic decisions are made in a mixed economy and a market economy? E.1.2
How Economic Decisions are Made
By the Government,
command
economy
By the Consumers
mixed
economy
market.
economy
O Consumers make all economic decisions in a mixed economy, while the government makes all economic decisions in a market economy.
Government and consumers make economic decisions in a mixed economy, while consumers make economic decisions in a market economy.
Government makes all economic decisions in a mixed economy, while consumers make all economic decisions in a market economy.
O Consumers make economic decisions in a mixed economy, while consumers and government make economic decisions in a market economy.
Answers
Based on the diagram, the correct statement is: Government and consumers make economic decisions in a mixed economy, while consumers make economic decisions in a market economy.
How do we explain?In a mixed economy, economic decisions are made by both the government and consumers.
The government plays a significant role in regulating and influencing economic activities through policies, regulations, and interventions.
In market economy, economic decisions are primarily made by consumers. The market forces of supply and demand dictate the allocation of resources, production levels, and pricing.
The freedom to buy and sell whatever they choose is what ultimately determines how commodities and services are produced and distributed.
Learn more about Economic Decisions at:
brainly.com/question/30296708
#SPJ1
An object, initially at rest, is subject to an acceleration of 45 m/s^2. How long will it take that object to travel 1000m? Round to one decimal place.
Answers
Answer:
6.7 seconds
Explanation:
d=(1/2)at^2
equation
1000=(1/2)45t^2.
substitute
2000=45t^2.
multiply by 2 for both sides
44.44=t^2.
divide both sides by 45
6.7=t
take the square root of both sides
HURRY!!!!
If all else stays the same, which change could be made to cause an increase in the gravitational force on a space shuttle?
1. increasing the distance of the space shuttle from Earth
2. decreasing the distance of the space shuttle from Earth
3. increasing the universal gravitational constant acting on the space shuttle
4. decreasing the universal gravitational constant acting on the space shuttle
Answers
Answer:
2. decreasing the distance of the space shuttle from Earth
Explanation:
To increase the gravitational force on a space shuttle, it is a good thing to decrease the distance of the space shuttle from the earth.
This is based on the Newton's law of universal gravitation which states that "the gravitational force between two bodies is a directly proportional to the product of their masses and inversely proportional to the square of the distance between them".
Mathematically;
F = \(\frac{G m_{1} m_{2} }{r^{2} }\)
G is the universal gravitation constant, it cannot be changed
m is the mass of the body
r is the distance
Since the distance is inversely proportional, is we reduce it, the value of the gravitational force will increase.
Answer:
The answer is B
Explanation:
took the exam
A textbook of mass 2.10 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.100 m , to a hanging book with mass 3.10 kg . The system is released from rest, and the books are observed to move a distance 1.29 m over a time interval of 0.850 s . Part A What is the tension in the part of the cord attached to the textbook
Answers
Answer:
the tension in the part of the cord attached to the textbook is 7.4989 N
Explanation:
Given the data in the question;
As illustrated in the image below;
first we determine the value of the acceleration,
along vertical direction; we use the second equation of motion;
y = ut + \(\frac{1}{2}\)a\(_y\)t²
we substitute;
0 m/s for u, 1.29 m for y, 0.850 s for t,
1.29 = 0×0.850 + \(\frac{1}{2}\)×a\(_y\)×(0.850)²
1.29 = 0.36125a\(_y\)
a\(_y\) = 1.29 / 0.36125
a\(_y\) = 3.5709 m/s²
Now when the text book is moving with acceleration , the dynamic equation will be;
T₁ = m₁a\(_y\)
where m₁ is the mass of the text book ( 2.10 kg )
a\(_y\) is the vertical acceleration ( 3.5709 m/s² )
so we substitute
T₁ = 2.10 × 3.5709
T₁ = 7.4989 N
Therefore, the tension in the part of the cord attached to the textbook is 7.4989 N
why the efficiency of the single movable pully system is not 100%
Answers
Answer:
This is because part of the energy input is used to overcome gravity, inertia and friction
Two blocks, 1 and 2, are connected by a massless string that passes over a massless pulley. 1 has a mass of 2.25 kg and is on an incline of angle 1=42.5∘ that has a coefficient of kinetic friction 1=0.205. 2 has a mass of 5.55 kg and is on an incline of angle 2=33.5∘ that has a coefficient of kinetic friction 2=0.105
. The figure illustrates the configuration.
A system of two blocks connected by a rope passing over a pulley. The system sits atop a scalene triangle whose long edge forms the base. The pulley is attached to the apex of the triangle. Box M subscript 1 rests on the triangle edge to the left of the pulley, which makes an angle of theta subscript 1 with the base of the triangle. The coefficient of friction between box M sub 1 and the surface is mu subscript 1. Box M subscript 2 rests on the triangle edge to the right of the pulley, which makes an angle of theta subscript 2 with the base of the triangle. The coefficient of friction between box M sub 2 and the surface is mu subscript 2.
Answers
The force acting on the system of two blocks connected by a rope passing over a pulley is -13.26 N.
The system of two blocks connected by a rope passing over a pulley are M1 and M2, where M1 rests on the triangle edge to the left of the pulley, which makes an angle of theta subscript 1 with the base of the triangle. The coefficient of friction between box M1 and the surface is mu subscript 1. M2 rests on the triangle edge to the right of the pulley, which makes an angle of theta subscript 2 with the base of the triangle.
The coefficient of friction between box M2 and the surface is mu subscript 2. The system sits atop a scalene triangle whose long edge forms the base. The pulley is attached to the apex of the triangle.M1 has a mass of 2.25 kg and is on an incline of angle 1=42.5∘ that has a coefficient of kinetic friction 1=0.205. M2 has a mass of 5.55 kg and is on an incline of angle 2=33.5∘ that has a coefficient of kinetic friction 2=0.105.The free-body diagram of M1 shows that the weight of M1 acts straight downwards (vertically) and the normal force acts perpendicular to the slope.
The force of friction opposes the motion and acts opposite to the direction of motion.M1 = 2.25 kgTheta subscript 1 = 42.5 degreesMu subscript 1 = 0.205g = 9.81 m/s²In the free-body diagram of M2, the normal force acts perpendicular to the incline of the slope, the weight of the object acts vertically downwards and parallel to the incline, and the force of friction opposes the motion and acts opposite to the direction of motion.M2 = 5.55 kgTheta subscript 2 = 33.5 degreesMu subscript 2 = 0.105g = 9.81 m/s²The tension in the string is the same throughout the rope. Since the masses are being pulled by the same rope, the acceleration of the objects is the same as the acceleration of the rope.
The tension in the string is directly proportional to the acceleration of the objects and the rope.A system of two blocks connected by a rope passing over a pulley has a total mass of M. The acceleration of the system is given by the formula below:a = [(m1-m2)gsin(θ1) - μ1(m1+m2)gcos(θ1)] / (m1 + m2)Where, μ1 = 0.205 is the coefficient of friction of block M1θ1 = 42.5 degrees is the angle of the incline of block M1M1 = 2.25 kg is the mass of block M1M2 = 5.55 kg is the mass of block M2g = 9.81 m/s² is the acceleration due to gravitysinθ1 = sin 42.5 = 0.67cosθ1 = cos 42.5 = 0.75The acceleration of the system is:a = [(2.25-5.55)(9.81)(0.67) - (0.205)(2.25+5.55)(9.81)(0.75)] / (2.25 + 5.55)a = -1.7 m/s² (the negative sign indicates that the system is accelerating in the opposite direction).
The force acting on the system is given by:F = MaWhere M is the total mass of the system and a is the acceleration of the system. The total mass of the system is:M = m1 + m2M = 2.25 + 5.55M = 7.8 kgThe force acting on the system is:F = 7.8(-1.7)F = -13.26 N (the negative sign indicates that the force is acting in the opposite direction).
for more question on force
https://brainly.com/question/12785175
#SPJ8
1)Answer the following question in sort
a)Define pressure ?
b)What is the value of standard atmospheric pressure?
c)Mention any one application of liquid pressure in our daily life?
d)Mention in the name of the instruments used to measure the pressure of compressed air?
e)Which instrument is used to measure atmospheric pressure ?
f)What is the unit of compressed air?
g)Define standard atmospheric pressure?
h)Which property of liquid is applicable in water supply system in cities?
i)Which property of liquid supports to use in it in hydraulic machine?
2)Answer the following questions in detail a)Define atmospheric pressure? Prove the presence of atmospheric pressure with the help of an activity?
b)Derive that P=dgh?
c)Describe the structure and working method of mercury barometer briefly?
d)Enlist any three points to show the importance of atmospheric pressure?
e)Enlist any four application of liquid pressure?f)Mention any three events occurred in our daily life which are directly related with pressure?
Answers
1)a) Pressure is the force exerted per unit area, measured in units such as pascals (Pa) or pounds per square inch (psi).
b) The value of standard atmospheric pressure is approximately 101.3 kilopascals (kPa) or 1 atmosphere (atm).
c) One application of liquid pressure in our daily life is in hydraulic systems, like car brakes, where liquid pressure is used to transmit force and amplify it.
d) The instruments used to measure the pressure of compressed air include pressure gauges or manometers.
e) An instrument called a barometer is used to measure atmospheric pressure.
f) The unit of compressed air is typically measured in pounds per square inch (psi) or pascals (Pa).
g) Standard atmospheric pressure is the pressure exerted by the Earth's atmosphere at sea level. It is approximately equal to 1 atm or 101.3 kPa.
h) The property of liquid that is applicable in water supply systems in cities is its ability to flow and exert pressure, allowing water to be distributed through pipes and reach different levels in buildings.
i) The property of liquid that supports its use in hydraulic machines is its incompressibility, allowing it to transmit force and energy effectively.
2) a)Atmospheric pressure is the force exerted by the weight of the Earth's atmosphere on a surface.
b) The equation P = dgh. This equation can be derived by considering the weight of the fluid column and the force it exerts on a unit area at the base.
c) A mercury barometer consists of a glass tube filled with mercury, inverted into a dish of mercury. The mercury in the tube adjusts its height based on the atmospheric pressure.
d) The importance of atmospheric pressure can be seen in its role in weather patterns, maintaining the balance of gases in the atmosphere, and facilitating breathing for humans and animals.
e) Applications of liquid pressure include hydraulic systems in machinery, such as lifts and cranes, hydraulic brakes in vehicles, and water towers for maintaining water pressure in buildings.
f) Events in daily life directly related to pressure include inflating a balloon, using a bicycle pump to inflate tires, and squeezing toothpaste out of a tube.
1)a) Pressure is defined as the force per unit area. Its unit in the S.I system is newtons per square meter (N/m²) or Pascal (Pa).
b) The value of standard atmospheric pressure at sea level is 101.3 kPa (kilopascals) or 1 atm (atmosphere). c) Liquid pressure has numerous applications in our daily life, but one of the most common ones is the hydraulic braking system used in cars.
d) An instrument used to measure the pressure of compressed air is called a pressure gauge. e) An instrument used to measure atmospheric pressure is called a barometer.
f) The unit of compressed air is generally psi (pounds per square inch).
g) Standard atmospheric pressure is the pressure exerted by the atmosphere at sea level and is equal to 101.3 kPa or 1 atm.
h) The property of liquids that is applicable in water supply systems in cities is their incompressibility. i) The property of liquids that supports their use in hydraulic machines is their incompressibility.
2)a) Atmospheric pressure is defined as the force per unit area exerted by the weight of the atmosphere on the surface. It is proven with the help of the following activity: Take a glass full of water and place a cardboard over it. Hold the cardboard tight and invert the glass. The water will not spill out of the glass, which is because the atmospheric pressure is greater on the cardboard than the pressure inside the glass.
b) The pressure exerted by a fluid can be derived using P = dgh, where P is the pressure, d is the density, g is the acceleration due to gravity, and h is the height of the fluid column.
c) A mercury barometer is made up of a glass tube that is closed at one end and filled with mercury. The tube is inverted and placed in a container of mercury. The pressure of the atmosphere on the open surface of the container forces the mercury in the tube to rise to a height that is proportional to the atmospheric pressure.
d) The importance of atmospheric pressure can be explained by the following points: it enables breathing, regulates the weather, and causes the ocean tides.
e) Some applications of liquid pressure include hydraulic brakes in cars, hydraulic lifts, and hydraulic jacks.
f) Some events that are directly related to pressure include gas escaping from a pressurized container, balloons being inflated, and soda cans being opened.
Know more about Pressure here:
https://brainly.com/question/28012687
#SPJ8
In the diagram, the distance OP is the focal length of the converging lens. One ray of light from O
is shown.
Through which point will this ray pass, after refraction by the lens?
Answers
The point through which this ray will pass, after refraction by the lens is point D.
What is refraction of light?The refraction of light refers to the bending or change in direction that occurs when light passes from one medium to another. It is a phenomenon that happens due to the difference in the speed of light in different substances.
From the ray diagram given, after the light incident from point O, it will pass the converging at point D which is the focal length of the lens after refraction.
Thus, based on the converging lens given in the ray diagram, we can conclude that, the point through which this ray will pass, after refraction by the lens is point D.
So point D is the correct answer.
Learn more about refraction here: https://brainly.com/question/1360744
#SPJ1