Answers
The correct image is option A.
Related Questions
A 2.8 F capacitor and a 3,440
Ω
resistor are connected to a battery of voltage 5 V as shown in the circuit. After
closing the switch, how long will it take for the capacitor voltage to be 45 % of
the battery voltage?
Express your answer in seconds (s)
Answers
The time taken for the capacitor voltage to be 45 % of the battery voltage is 5,750.3 s.
Discharge of the capacitor voltage
The rate at which the capacitor voltage discharges is given by the following formula;
\(V = V_0(1 - e^{-t/RC})\)
Where;
V₀ is the initial voltageV is the final voltaget is the time of dischargeR is resistanceC is capacitanceThe final voltage = 0.45 x 5 V = 2.25 V
\(2.25 = 5(1 - e^{-t/RC})\\\\(1 - e^{-t/RC}) = \frac{2.25}{5} \\\\(1 - e^{-t/RC}) = 0.45\\\\e^{-t/RC} = 1- 0.45\\\\e^{-t/RC} = 0.55\\\\\frac{-t}{RC} = ln(0.55)\\\\\frac{-t}{RC} = -0.597\\\\t = 0.597 (RC)\\\\t = 0.597(3440 \times 2.8)\\\\t = 5,750.3 \ s\)
Thus, the time taken for the capacitor voltage to be 45 % of the battery voltage is 5,750.3 s.
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The following is an example of what type of reaction?
Answers
Answer:
Single Displacement Reaction
Explanation:
Here, only one element is getting replaced during the reaction, that is, silver gets replaced by copper, hence, single displacement reaction.
Hope it helps :)
Which electromagnet is the strongest?
An illustration of a metal bar with a coil of wire around it.
An illustration of a metal bar with a coil of wire around it it has more coils.
An illustration of a metal bar with a coil of wire around it it has less coils.
* The Answer is the 2nd picture - An illustration of a metal bar with a coil of wire around it it has more coils.
Answers
Therefore, of the three options given, the electromagnet with more coils around the metal rod is the most powerful if all other factors such as current and core material are kept constant.
What is the very short response to an electromagnet?
An electromagnet is a temporary magnet made by winding a wire around an iron core. When current flows through the coil, iron becomes a magnet, and when the current is cut off, it loses its magnetic properties.
What is Electromagnetism?
Electromagnetism is the branch of physics that deals with the electromagnetic forces that occur between charged particles. Electromagnetic force is one of the four basic forces and describes the electromagnetic field.
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Answer: The answer is B
Explanation:
A device for acclimating military pilots to the high accelerations they must experience consists of a horizontal beam that rotates horizontally about one end while the pilot is seated at the other end. In order to achieve a radial acceleration of 27.9 m/s2 with a beam of length 5.21 m , what rotation frequency is required
Answers
Answer: the angular frequency is 2.31 rad/s
Explanation:
The data we have is:
Radial acceleration A = 27.9 m/s^2
Beam length r = 5.21m
The radial acceleration is equal to the velocity square divided the radius of the circle (the lenght of the beam in this case)
And we can write the velocity as:
v = w*r where r is the radius of the circle, and w is the angular frequency.
w = 2pi*f
where f is the "normal" frequency.
So we have:
A = (v^2)/r = (r*w)^2/r = r*w^2
We can replace the values and find w.
27.9m/s^2 = 5.21m*w^2
√(27.9/5.21) = w = 2.31 rad/s
A small car moving at 20 m/sec collides head on with an oncoming large truck moving at 25 m/sec. Which vehicle undergoes the largest change in its momentum
Answers
Answer:
The truck will undergo the largest change in momentum if it has a greater mass than the small car.
Explanation:
The change in momentum of an object can be calculated using the equation:
Δp = m * Δv
where Δp represents the change in momentum, m represents the mass of the object, and Δv represents the change in velocity.
Since we are comparing the change in momentum of the car and the truck, we need to consider the masses of both vehicles.
Let's assume the mass of the car is represented by m_car, and the mass of the truck is represented by m_truck.
Since both vehicles collide head-on, the change in velocity (Δv) will be the difference between their initial velocities, considering that they are moving in opposite directions:
Δv = v_truck - v_car
Now, let's compare the change in momentum for the car and the truck:
For the car:
Δp_car = m_car * Δv
For the truck:
Δp_truck = m_truck * Δv
Comparing the magnitudes of the change in momentum, we can neglect the negative sign:
|Δp_car| = |m_car * Δv|
|Δp_truck| = |m_truck * Δv|
Since both Δv and Δp are positive values, we can conclude that the vehicle with the greater mass will undergo the largest change in its momentum.
Therefore, if the mass of the truck (m_truck) is greater than the mass of the car (m_car), then the truck will undergo the largest change in its momentum. Conversely, if the mass of the car is greater, then the car will undergo the largest change in its momentum.
A roller coaster starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22m/s in the same direction. What
is its acceleration? Was this acceleration positive or negative? Why? Show your work and units. (use GRESA format)
Answers
The acceleration of the object is 6 m/s^2 in the positive direction.
What is the acceleration?We know that the term acceleration has to do with the rate of the change of the velocity with time. Now we know know that its velocity is 4 m/s. But 3 seconds later, its velocity is 22m/s in the same direction.
Thus using;
a = v - u/t
a = acceleration'
v = final velocity
u = initial velocity
t = time taken
Thus;
a = 22 - 4/3
a = 6 m/s^2
Thus we have that the acceleration is increasing in the positive direction.
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Which of the following is a characteristic of inner planets?
Answers
I hope this helps you :$
What is the average speed of a car that travels 100 m over 10 s?
Answers
Answer: 10m per second.
Explanation: 100/10 is 10/1, so it would be 10m per second.
What is the biggest planet in the solar system
Answers
Answer:
Jupiter
Explanation:
Answer:
The answer is Jupiter.
Explanation:
Jupiter is an orange/yellow colored planet.
1. What are electromagnetic waves?
Question 1 options:
Waves of energy traveling through a space.
Waves of energy traveling through a solid.
Waves of energy traveling through a liquid.
Answers
Answer:
Waves of energy traveling through a space
Explanation:
please help science .
Answers
Answer:
I think it's shape the shape of the samples
You have a new goal of saving at least $4,500 over the course of the next year.
You already have $900 saved.
By how much would you need to increase your monthly net savings in order to meet this goal?
Answers
Answer:
You would need to save $300 every month to meet your savings goal.
Explanation:
4,500-900=3,600
3,600/12=300
Answer:
answer is 200
Explanation:
edge 2021
A heavy copper ball of mass 2 kg is dropped from a fiftieth-floor apartment window. Another one with mass 1 kg is dropped immediately after 1 second. Air resistance is negligible. The difference between the speeds of the two balls:__________.
a. increases over time at first, but then stays constant.
b. decreases over time.
c. remains constant over time.
d. increases over time.
Answers
Answer:
C
Explanation:
Because everything on Earth falls at the same speed, the masses of the balls do not matter. Since the acceleration due to gravity is constant, their speeds will both be increasing at the same rate, and therefore the difference in speeds would remain constant until they hit the ground. Hope this helps!
Rita raises a 10kg package to a height of 2.5 m in 2.0 s.
(a) How much work did she do on the package?
(b) How much power was expended on the package?
(c) It she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?
Answers
Answer:
A) W =250J B) Power = 125 J/s C) Work = 250 J Power = 250 J/s
Explanation:
Work = Force*distance
A:
\(W = 10kg*10m/s^2*2.5m\\W = 250 J\\\)
B:
Power is J/s
Power = 250J/2.0s = 125 J/s
C:
Work stays the same
Power increases to 250 J/s
The heating element in an electric kettle is rated as 2.0 kW. If the water in the kettle is at 100.0 °C, what volume of water will be converted into steam in one minute? The specific latent heat of vaporization of the water is 2,257,000 J/kg and the
3 density of water is 1,000 kg/m .
Answers
Answer:
The volume is \(V =5.32 *10^{-5} \ m^3\)
Explanation:
From the question we are told that
The power of the heating element is \(P = 2.0 kW = 2.0 *10^3 \ W\)
The temperature of the water in the kettle is \(T _w = 100^oC\)
The time to convert water to steam is t = 1 minute = 60 sec
The specific latent heat of vaporization is \(H_v = \ 2,257,000 J/kg\)
The density of water is \(\rho_w = 1000\ kg/m^3\)
The power of the heating element is mathematically represented as
\(P = \frac{E}{t}\)
Where E Energy generated by the heating element in term of heat
\(E = Pt\)
substituting values
\(E = 2.0 *10^{3} * 60\)
\(E = 120000 J\)
Now
The latent heat of vaporization is mathematically represented as
\(H_v = \frac{E}{m}\)
Where m is the mass of water converted to steam
So
\(m = \frac{E}{H_v}\)
substituting values
\(m = \frac{120000}{2257000}\)
\(m = 0.0532\ kg\)
The volume of water converted to steam is mathematically evaluated as
\(V = \frac{m }{\rho_w}\)
substituting values
\(V = \frac{0.0532}{1000}\)
\(V =5.32 *10^{-5} \ m^3\)
You are raising up a big bucket of water from a 25.9 m deep well. The combined mass of the water and the bucket is 13.9 kg. The bucket is attached to a heavy duty steel chain. The mass of the chain is 19.3 kg.
1. How much work do you perform during the lifting process?
2. If it takes 1.75 minutes for you to raise the bucket of water out of the well, then what was your average power?
Answers
1. The amount of work done during the lifting process is 8426.824 J
2. The average power used in the process is 80.26 Watts
1. How to determine the workdone Combine mass (m) = 13.9 + 19.3 = 33. 2 KgAcceleration due to gravity (g) = 9.8 m/s²Height (h) = 25.9 mWork done (Wd) =?Wd = mgh
Wd = 33. 2 × 9.8 × 25.9
Wd = 8426.824 J
2. How to determine the powerWork done (Wd) = 8426.824 JTime (t) = 1.75 mins = 1.75 × 60 = 105 sPower (P) =?P = Wd / t
P = 8426.824 / 105
P = 80.26 Watts
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A 1.0 ball moving at 2.0 / perpendicular to a wall rebounds from the wall at 1.5 /. If the ball was in contact with the wall for 0.1 , what force did the wall impart onto the ball?
Answers
Answer:
5N
Explanation:
We have a simple problem of momentum here.
ΔMomentum= mΔv= FΔt
Solve for F
mΔv/Δt=F
Plug in givens
1*(2-1.5)/0.1=F
F=5N
The amount of force that the wall imparts on the ball is 5.0N
According to Newton's second law, the formula for calculating the force applied is expressed as:
\(F=ma\)
m is the mass of the object
a is the acceleration of the object
Since acceleration is the change in velocity of an object, hence \(a=\frac{\triangle v}{t}\)
The applied force formula becomes \(F=\frac{m\triangle v}{t}\)
Given the following parameters
m = 1.0kg
\(\triangle v=2.0-1.5\\\triangle v=0.5m/s\)
t = 0.1sec
Substitute the given parameter into the formula
\(F=\frac{1.0\times 0.5}{0.1}\\F=\frac{0.5}{0.1}\\F=5N\)
Hence the amount of force that the wall imparts on the ball is 5.0N
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A car is driving counterclockwise on a circular path, moving at non-uniform speed. The small black circles in the figure show the position of the object in equal intervals of time.
a- The x component of the instantaneous acceleration at B is negative, positive or zero? Why?
b- The y component of the instantaneous acceleration at B is negative, positive or zero? Why?
Answers
a- The instantaneous acceleration at B has a negative x component.
b- The instantaneous acceleration at B has a positive y component.
Explain about the uniform circular motion?We refer to a particle as being in uniform circular motion when it is traveling in a circular path (and perhaps a portion of one) at a constant speed.
The object is accelerating despite the fact that its speed is remaining constant because of a change in direction in its velocity (v).We refer to a particle moving uniformly around a circle as having a centripetal acceleration owing to the direction of the acceleration, which is toward the center.It is useful to discuss the time T required for the particle to accomplish one full trip around the circle if the particle consistently follows a complete circular path. This is referred to as the motion's period.On a round, counterclockwise route, an automobile is traveling at an irregular speed.
The position of a object is depicted in the figure's tiny black circles at regular intervals of time.
a- The instantaneous acceleration at B has a negative x component.
Because the x-component of the velocity will be be along the negative x axis, which will be directed towards point D.
b- The instantaneous acceleration at B has a positive y component. Because, the y-component of the velocity will be be along the positive y-axis, which will be directed towards point C.
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PLEASE HELP QUICK! i don’t know this one
Answers
Designed and developed by private companies: Commercial satellite.
Used to access electronic intelligence: Reconnaissance satellite.
Used to make strategic decisions in advance: Early warning satellite.
Used to assist in strike planning: Reconnaissance satellite.
Remote sensing: Commercial satellite.
How to explain the informationCommercial Satellite are designed and developed by private companies and are primarily used for commercial purposes. They can provide a wide range of services, including telecommunications, broadcasting, internet connectivity, and navigation. Commercial satellites are often operated by companies like SpaceX, OneWeb, or Iridium.
Reconnaissance satellites are used to gather information about a specific area or target. They are equipped with advanced imaging systems, such as high-resolution cameras or synthetic aperture radar (SAR), which allow them to capture detailed images or collect other types of data for military or intelligence purposes.
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Say an impulse is applied opposite the go-kart's direction of travel. What happens to
the go-kart if its momentum + impulse = 0?
The go kart stops comes to a stop.
The go kart slows down but keeps moving.
The go kart speeds up.
There is no change in the speed of the go kart.
Answers
If the impulse is strong enough and lasts for a sufficient amount of time, the go-kart will eventually come to a stop.
Option A is correct.
What is meant by impulse?impulse is described as the integral of a force, F, over the time interval, t, for which it acts. Since force is a vector quantity, impulse is also a vector quantity.
If the force is insufficient to stop the go-kart entirely, it will slow down but continue to move. The force and duration of the impulse, along with the mass and speed of the go-kart, will all affect how much deceleration occurs.
Given that momentum plus impulse equals zero, the go-kart's change in momentum as a result of the impulse will be equal in amount but will move in the opposite direction of its original momentum.
As a result, the go-kart's final momentum will be zero, suggesting that it has either stopped or is travelling very slowly.
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Step 7: Explore the Effect of Adding More Mass to the String.
Calculate the average time it took the car to travel 0.25 and 0.50 meters with the three washers attached to the pulley. Record the averages, rounded to two decimal places, in Table C of your Student Guide.
What is the average time it took the car to travel 0.25 meters? _____ seconds.
What is the average time it took the car to travel 0.50 meters? _____ seconds.
Answers
Answer:
1.92
2.61
Explanation:
The average time taken by the car to cover a distance of 0.25 meters and 0.50 meters which is based on the three trial times are :
Distance of 0.25 meters = 2.23 seconds
Distance of 0.50 meters = 3.13 seconds
What is Distance?Distance is defined as a numerical or sometimes a qualitative measure of how far objects or points are. Distance can be described as a physical length or as an approximation based on other criteria.
It can be calculated by:
Distance= Speed x time
Where, Distance is in Meter or kilometer
Speed is in meter per second or km/min
Time is in seconds or minutes
From the above formula, we can also calculate the time like for above given information,
Average travel time to cover 0.25 meters :
(Trial 1 time + Trial 2 time + Trial 3 time) ÷ 3
(2.24 + 2.21 + 2.23) ÷ 3
(6.68 ÷ 3) = 2.226667 = 2.23 seconds
Average travel time to cover 0.50 meters :
(Trial 1 time + Trial 2 time + Trial 3 time) ÷ 3
(3.16 + 3.08 + 3.15) ÷ 3
9.39 ÷ 3 = 3.13 seconds
Thus, the average time taken to cover 0.25 and 0.50 meters are 2.23 and 3.13 seconds respectively
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astone is thrown upwards with an initial velocity of 25m/s atan angle of 30 to the ground.what is the work out the stones horizantal range ?
Answers
Answer:
Range is 62.5 metres
Explanation:
Time of flight
\(t = \frac{2u \sin( \theta) }{g} \)
for range, acceleration is zero
from second newton's equation:
\(S = ut + \frac{1}{2} {at}^{2} \)
but a = 0:
let range be x:
\(x = ut \\ x = \frac{2 {u}^{2} \sin( \theta) }{g} \\ \\ x = \frac{ \{2 \times 25 {}^{2} \sin(30 \degree) \}}{10} \\ \\ x = 62.5 \: metres\)
[ taken g to be 10 m/s² ]
How to find the angle in a projectile motion when displacement and heigh are the same
Answers
projectile's vertical speed v yv y v, start , y, drops prior to reaching its maximum height since its acceleration is in the opposite direction. Since the object's height is rising, the initial direction of the velocity is upward
.
At the projectile's highest point, vertical velocity zeroes out. After reaching the highest point, the vertical speed increases due of the same-direction acceleration. As the object's height lowers, the vertical velocity has a downward direction.
In projectile The beginning vertical velocity determines the maximum height. Increasing the launch angle raises the maximum height because steeper launch angles have a larger vertical velocity component.
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A car moves in a straight line at a speed of 68.5 km/h. How far (in km) will the car move in 5.45 minutes at this speed?
Answers
Your Answer is 6.222!!!!
What is White light? Give your answer in one word.
Answers
Answer:
Colorless light
Explanation:
An example is day light.
5. A person on a trampoline jumps straight up. When the person is 3 m above the surface and
with upward velocity of 2.5 m/s, drops a ball. a) What is the speed of the ball at the time of
impact? b) How long before the ball impacts the surface of trampoline?
Answers
a)The speed of the ball at the time of impact will be 8.1 m/sec.
b)The time taken by the ball impacts the surface of trampoline will be 1.1 second.
What is speed?Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. Its SI unit is m/sec.
Given data;
g( gravitational acceleration) = 9.81 m/s2
u (initial velocity of ball) = 2.5 m/s
h₁(initial height of the ball) = 3.0 m
v (speed of the ball at the time of impact ) ?
The time taken by ball for upward journey = u / g
t₁ = u / g
t₁ = (2.5 m/s) / (9.81 m/s2) =
t₁ =0.2548 s
From second equation of motion,upward vertical distance covered by ball is;
\(\rm h_2= \frac{1}{2} gt^2\\\\ h_2=\frac{1}{2} \times 9.81 \times (0.2548)^2\\\\ h_2=0.3184\)
The total distance in the downward direction travelled;
\(\rm h_3=h_1+h_2 \\\\ h_3=3.0+0.3184 \\\\ h_3=3.3184 \ m\)
The time taken for the downward motion is;
\(\rm t_2 = (\frac{2 \times h_3 }{g} )^\frac{1}{2}\\\\ t_2 = 0.825 \ m/sec\)
The speed of the ball at the time of impact is found as;
\(\rm V=gt_2 \\\\ V= 9.81 \times 0.8225 \\\\ V= 8.07 \ m/sec\)
The total time of the flight of ball is;
\(\rm t_3 = t_1+t_2 \\\\ t_3=0.2548+0.8225 \\\\ t_3=1.0774 \ sec\)
Hence,the speed of the ball at the time of impact will be 8.1 m/sec and time taken by the ball impacts the surface of trampoline will be 1.1 second.
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which of the following has greater number of hydrogen molecule ? 9 gm of CH4 or 10gm of NH3
Answers
Explanation:
I don't knoejajajajjjaj
An object A is placed 12cm in front of a concave mirror M₁ of focal length 8cm and a plane mirror M₂ is placed 30cm in front of the concave mirror as shown in Figure 1 The object A is first reflected by M₁and then reflected by M₂ to get an image 1₂. What is the distance between 1₂ and the object A？
Answers
According to the question the distance between the object A and the image 1₂ is 6 cm.
What is distance?Distance is the measure of how far apart two objects, points, or locations are from one another. Distance can be measured in linear units such as feet, meters, or kilometers, or angular units such as degrees. The concept of distance is a fundamental concept in mathematics, physics, and other sciences. Distance is used to calculate the speed and velocity of objects, as well as the force of gravity between two objects.
The distance between the object A and the image 1₂ can be calculated using the mirror equation.
Mirror equation: 1/d₁ + 1/d₂ = 1/f
Where d₁ is the object distance, d₂ is the image distance, and f is the focal length of the mirror.
In this case, d₁ = 12 cm, d₂ = ? and f = 8 cm.
Substituting these values into the equation gives us:
1/12 + 1/d₂ = 1/8
Rearranging the equation gives us:
1/d₂ = 1/8 – 1/12
Plugging in the values gives us:
1/d₂ = 1/8 – 1/12 = 1/6
Solving for d₂ gives us:
d₂ = 6 cm
Therefore, the distance between the object A and the image 1₂ is 6 cm.
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A spring has an unstretched length of 10 cm. It exerts a restoring force F when stretched to a length of 13 cm. a. For what length of the spring is its restoring force 3F? b. At what compressed length is the restoring force 2F?
Answers
The length at which the restoring force is 2F is given by the following expression:
\(x = (-2F + F / (13 cm - 10 cm) * 10 cm) / (F / (13 cm - 10 cm))\)
What is restoring force?The restoring force of a spring is proportional to its displacement from its unstretched length, according to Hooke's law:
F = -kx
where F is the restoring force, k is the spring constant, and x is the displacement from the unstretched length.
If we know the restoring force F when the spring is stretched to a length of 13 cm, we can find the spring constant k:
\(F = -k * (13 cm - 10 cm)\\k = F / (13 cm - 10 cm)\)
Next, we can find the displacement that gives a restoring force of 3F:
\(3F = -k * (x - 10 cm)\\3F = -k * x + k * 10 cm\\-3F = k * x - k * 10 cm\\-3F + k * 10 cm = k * x\\x = (-3F + k * 10 cm) / k\)
Substituting the value of k, we get:
\(x = (-3F + F / (13 cm - 10 cm) * 10 cm) / (F / (13 cm - 10 cm))\)
So, the length of the spring for which its restoring force is 3F is given by the above expression.
b. To find the length at which the restoring force is 2F, we can use the same method as above and replace 3F with 2F:
\(2F = -k * (x - 10 cm)x = (-2F + k * 10 cm) / k\)
Substituting the value of k, we get:
\(x = (-2F + F / (13 cm - 10 cm) * 10 cm) / (F / (13 cm - 10 cm))\)
So, the length at which the restoring force is 2F is given by the above expression.
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What is the ratio of the earth's gravitational force on you, to your gravitational force on the earth?
Answers
Answer: 10%
Explanation:
n this case, if the earth' mass goes up by 10%, then the force of gravity on you, or your weight, will increase by the same amount, that is 10%