Answers
Answer:
non-metal if that is an answer
Answer:
The answer is Ionic on edge
Explanation:
Related Questions
Question 2 of 15
When the source of a sound is moving, its speed increases.
A. True
B. False
Answers
a wave emitted from a source has a frequency of 10.8 Hz and wavelength 1.1 How much time will it take to reach a person located 7.2 m from then source? (round your answer to the nearest tenth
Answers
The time taken by the wave is approximately 0.6 seconds to reach the person located 7.2 m from the source.
To calculate the time taken for a wave to travel a certain distance, we need to use the formula:
time = distance / speed
We can find the speed of a wave by using the formula:
speed = frequency x wavelength
In this case, the frequency of the wave is given as 10.8 Hz and the wavelength is given as 1.1 m. So we can calculate the speed as:
speed = 10.8 Hz x 1.1 m = 11.88 m/s
Now we can use this speed to calculate the time taken for the wave to travel a distance of 7.2 m:
time = 7.2 m / 11.88 m/s = 0.6 seconds
Therefore, the wave will take approximately 0.6 seconds to reach the person located 7.2 m from the source.
It's important to note that this calculation assumes that the wave is traveling in a vacuum. In reality, the speed of a wave can vary depending on the medium it is traveling through. For example, sound waves travel at different speeds in air and water.
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A prismatic bar AB of length L and solid circular cross section (diameter d) is loaded by a distributed torque of constant intensity t per unit distance .
(a) Determine the maximum shear stress tmax in the bar
(b) Determine the angle of twist between the ends of the bar.
Answers
Answer:
a) the maximum shear stress τ\(_{max}\) the bar is 16T\(_{max}\) /πd³
b) the angle of twist between the ends of the bar is 16tL² / πGd⁴
Explanation:
Given the data in the question, as illustrated in the image below;
d is the diameter of the prismatic bar of length AB
t is the intensity of distributed torque
(a) Determine the maximum shear stress tmax in the bar
Maximum Applied torque T_max = tL
we know that;
shear stress τ = 16T/πd³
where d is the diameter
so
τ\(_{max}\) = 16T\(_{max}\) /πd³
Therefore, the maximum shear stress τ\(_{max}\) the bar is 16T\(_{max}\) /πd³
(b) Determine the angle of twist between the ends of the bar.
let theta (\(\theta\)) be the angle of twist
polar moment of inertia \(I_p}\) = πd⁴/32
now from the second image;
lets length dx which is at distance of "x" from "B"
Torque distance x
T(x) = tx
Elemental angle twist = d\(\theta\) = T(x)dx / G\(I_{p}\)
so
d\(\theta\) = tx.dx / G(πd⁴/32)
d\(\theta\) = 32tx.dx / πGd⁴
so total angle of twist \(\theta\) will be;
\(\theta\) = \(\int\limits^L_0 \, d\theta\)
\(\theta\) = \(\int\limits^L_0 \,\) 32tx.dx / πGd⁴
\(\theta\) = 32t / πGd⁴ \(\int\limits^L_0 \, xdx\)
\(\theta\) = 32t / πGd⁴ [ L²/2]
\(\theta\) = 16tL² / πGd⁴
Therefore, the angle of twist between the ends of the bar is 16tL² / πGd⁴
5. A hammer is dropped from the top of atower that is 400 m high. If we neglect airresistance so that the only force on thehammer is gravity, with what velocity doesthe hammer strike the ground?
Answers
We wil have the following:
First, we will determine the travel time:
\(400m=(0m)+(0m/s)t+\frac{1}{2}(9.8m/s^2)t^2\Rightarrow t^2=\frac{2(400m)}{(9.8m/s^2)}\)\(\Rightarrow t^2=\frac{4000}{49}s^2\Rightarrow t=\frac{20\sqrt[]{10}}{7}s\)\(\Rightarrow t\approx9.0s\)Now, we find the velocity after that time:
\(v=(0m/s)+(9.8m/s^2)(20\sqrt[]{10}/7s)\Rightarrow v=28\sqrt[]{10}m/s\)\(\Rightarrow v\approx88.5m/s\)So, it will have approximately 88.5 m/s.
I need help with this answer
Answers
Answer:
Single Replacement
Explanation:
What is the focal length of a curved mirror if an object 2 meters in front of the mirror creates an image 1.3 meters behind the mirror?
Answers
The focal length of the curved mirror is 6.67 meters.
The focal length of a curved mirror can be calculated using the mirror equation:
1/F = 1/Do + 1/Di
Where:
F = focal length of the mirror,
Do = distance of the object from the mirror and
Di = distance of the image from the mirror
In the given case, the object is located 2 meters in front of the mirror and the image is located 1.3 meters behind the mirror. Therefore:
according to the given data:
Do = 2 m
Di = -1.3 m (negative sign indicates that the image is behind the mirror)
Substituting in the equation, we get:
1/f = 1/2 - 1/1.3
Simplifying:
1/f = 0.15
Multiplying both sides by f:
= 6.67 meters
Therefore, the focal length of the curved mirror is 6.67 meters.
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What is the only force that acts on an object in free fall? centripetal friction gravity
Answers
Answer:
one with only gravity acting upon it
Explanation:
Edgenuity :)
What is the Pythagorean Theorem used to find and what must you have to use it?
a. magnitude, fight triangle
b. direction, right triangle
c. magnitude, parallelogram
d. direction, parallelogram
Answers
Answer:
A
Explanation:
at which type of plate boundary will a trench most likely form
Answers
What is refractive index?
Answers
\( \huge \mathbb \red{HEY \: THERE ♡}\)
Refractive Index:The ratio of the sine of angle of incidence to the sine of angle of refraction in case of lens for light of a given colour and given pair of media is constant. Note** It is also called Snell's Law of Refraction. \( \mathsf \orange{\frac{sine \: i}{sine \: r} = constant}\)\( \huge \mathbb\pink{HOPE \: IT \: HELPS}\)
13. A tow-truck applies a force of 2,000 N on a 2,000 kg car for a period of 3 seconds. What is the magnitude of
the change in the car's momentum?
Answers
Answer:
The Formula is
Change in Momentum = Force * Time
or /\P= F/\t
Plug the numbers into that formula,
P=(2,000N)(3S)
Now Multiply
Your Change in Momentum (Or P) would be 6,000N*s
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The magnitude of the change in the car's momentum = 6000 N.s
What is change in momentum ?The rate of change of momentum is equal to impulse . It is the change in the product of mass and velocity of the body or it can be calculated as force times time period for which force is been applied
Change in momentum = impulse(if change occur for few seconds ) = Force * time period
given
Force = 2000 N
mass = 2000 kg
time = 3 seconds
Change in momentum = 2000 * 3 = 6000 N.s
The magnitude of the change in the car's momentum = 6000 N.s
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If you drop a bouncing ball from a height of 40 cm, explain why it can only bounce back up to a height of less than 40 cm.
Answers
Answer:
Due to energy loss while collision ball will not reach to same height while if there is no energy loss then in that case ball will reach to same height
Explanation:
Explanation:
As we know that initially ball is held at height h = 40 cm
So here we can say that kinetic energy of the ball is zero and potential energy is given as
U = mgHU=mgH
now when strike with the ground then its its fraction of kinetic energy is lost in form of other energies
So the ball will left rebound with smaller
Romeo and Juliet are sitting on a balcony 1.5 meters apart. If Romeo has a mass of 61.6 Kg and Juliet has a mass of 48.8 kg. What is the attractive force between them?
Answers
Which best labels the chart?
Title 1 is “Longitudinal Waves,” and Title 2 is “Transverse Waves.”
Title 1 is “Transverse Waves,” and Title 2 is “Longitudinal Waves.”
Title 1 is “Electromagnetic Waves,” and Title 2 is “Mechanical Waves.”
Title 1 is “Mechanical Waves,” and Title 2 is “Electromagnetic Waves.”
Answers
Answer:
the answer is b!!!!
Explanation:
just took the test
The best labeling for the chart would be Title 1 is "Transverse Waves," and Title 2 is "Longitudinal Waves." Therefore, the correct option is B.
The two types of waves that are the subject of the chart under consideration are transverse waves and longitudinal waves. While longitudinal waves have vibrations parallel to the path of wave travel, transverse waves have vibrations perpendicular to the direction of wave propagation.
The graphic distinguishes between these wave types by designating title 1 as "transverse wave" and title 2 as "longitudinal wave". Using this labeling, viewers can understand and differentiate the two wave ranges based on their unique characteristics.
So, the correct option is B.
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On a still water, a speedboat decreases its speed uniformly from 30 m/s to 20 m/s. How long does it take the boat to travel a distance of 200m?
a. -8 s
b. 8 s
c. -200 s
d. 200 s
Answers
Answer:
t=8
Explanation:
u have solution I give solution also
don't mark plzz follow y
a woman walks south at a speed of 2.0mph for 60 minutes. She then turns around and walks north at a distance of 3000m in 25 minutes. What is the woman's average speed during her entire motion?
Answers
When a woman walks south at a speed of 2.0mph for 60 minutes. She then turns around and walks north at a distance of 3000m in 25 minutes. then the woman's average speed during her entire motion would be 73.15 meters /minute.
What is speed?The total distance covered by any object per unit of time is known as speed.
the mathematical expression for speed is given by
speed = total; distance /total time
As given in the problem a woman walks south at a speed of 2.0mph for 60 minutes
60 min = 1 hour
1 mile = 1.60934 km
The distance covered by her southwards = speed ×time
=2 mph × 60 minutes
= 3.218 km
She then turns around and walks north at a distance of 3000m in 25 minutes
The distance covered northward is 3000m
speed = total distance /total time
=(3218 +3000) /(60+25)
=73.15 meters /minutes
Thus, The average speed of the woman would be 73.15 meters /minute.
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what is the voltage supplied to a wire that has a resistance of 1200 Q and a current of 0.10 amps
Answers
The voltage supplied to the wire is 120 volts.
To calculate the voltage supplied to a wire, we can use Ohm's Law, which states that voltage (V) is equal to the product of current (I) and resistance (R). Mathematically, this relationship is expressed as V = I * R.
In this case, the wire has a resistance of 1200 Ω (ohms) and a current of 0.10 amps. We can substitute these values into the formula to find the voltage:
V = I * R
V = 0.10 A * 1200 Ω
V = 120 A * Ω
Therefore, the voltage supplied to the wire is 120 volts.
It's important to note that Ohm's Law holds true for resistors and other components in a circuit that obey Ohm's Law. In real-world scenarios, there may be other factors to consider, such as the presence of non-ohmic devices or components with varying resistance.
Additionally, in an AC (alternating current) circuit, the relationship between voltage, current, and resistance may involve complex quantities and phase differences. However, for a simple DC (direct current) circuit with a linear resistor, Ohm's Law provides an accurate relationship between voltage, current, and resistance.
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Three small spheres, A, B, and C, have charges with magnitudes qA, qB, and qC, respectively.The three spheres are aligned along a straight line, as shown in the figure. At the instant shown, the net force on sphere A is zero.:
1. Which of the following statements must be true of the signs of the charges?
a. Only charges qA and qB have the same sign.
b. Only charges qA and qC have the same sign.
c. Only charges qB and qC have the same sign.
d. Charges qB and qC have different signs.
e. Charges qA, qB, and qC all have the same sign.
2. The ratio qC/qB is...
a. 9/4
b. 1/1
c. 4/9
d. 1/4
e. 1/9
3. Which of the following is true about the sign of charge qA?
a. The sign of charge qA must be the same as that of qB.
b. The sign of charge qA must be the same as that of qC.
c. The sign of charge qA must be the same as that of either qB or qC greater magnitude.
d. The sign of charge qA must be the same as that of either qB or qC lesser magnitude.
e. It is possible that qA could be either positive or negative.
OFFERING A LOT OF POINTS FOR ANSWERS AND EXPLANATIONS TO ALL THREE!!
Answers
1. Charges qB and qC have different signs.
2. The ratio qC/qB is 9/4.
3. The sign of charge qA must be the same as that of either qB or qC lesser magnitude.
What is electric force?Electric force is the attracting or repulsive interaction between any two charged things. Similar to any force, Newton's laws of motion describe how it affects the target body and how it does so.
1. As net force on qA is zero, charges qB and qC have different signs.
2. The ratio qC/qB is = (3d)²/(2d)² = 9/4.
3. As the net force on qA is zero, the sign of charge qA must be the same as that of either qB or qC lesser magnitude.
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What is the charge of 4 protons and 4 electrons?
Answers
The charge of an atom with 4 protons and 4 electrons is zero.
Protons are made from two up-quarks with a charge of 2/3, and one down-quark with a charge of -1/3. Neutrons are the opposite, with one up-quark and two down-quarks. If you add the charges, you get 2/3+2/3–1/3 = 3/3 = +1 for protons, and 2/3–1/3–1/3 = +0 for neutrons. Electrons aren’t made of quarks, but have a charge of -1.
Charge of protons = + 1 * 4
Charge of protons = + 4
Charge of electrons = - 1 * 4
Charge of electrons = - 4
Charge of the atom = + 4 - 4
Charge of the atom = 0
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An aeroplaneflying above groundnd490m with 100 meterpersecond how far on ground it will strike
Answers
The airplane will strike the ground at a horizontal distance of 490 meters.
To determine how far the airplane will strike on the ground, we need to consider the horizontal distance traveled by the airplane during its flight.
The horizontal distance traveled by an object can be calculated using the formula:
Distance = Speed × Time
In this case, the speed of the airplane is given as 100 meters per second and the time it takes to cover the distance of 490 meters is unknown. Let's denote the time as t.
Distance = 100 m/s × t
Now, to find the value of time, we can rearrange the equation as follows:
t = Distance / Speed
t = 490 m / 100 m/s
t = 4.9 seconds
Therefore, it takes the airplane 4.9 seconds to cover a horizontal distance of 490 meters.
Now, to calculate the distance on the ground where the airplane will strike, we can use the formula:
Distance = Speed × Time
Distance = 100 m/s × 4.9 s
Distance = 490 meters
It's important to note that this calculation assumes a constant speed and a straight flight path. In reality, various factors such as wind conditions, changes in speed, and maneuvering can affect the actual distance traveled by the airplane.
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A certain cylinder has a height of 10.0 cm and a radius of 5.0 cm. To how many significant figures can its volume be determined?
Answers
Answer:
The volume of a cylinder is given by the formula V = πr^2h, where r is the radius and h is the height. Substituting the given values, we get:
V = π(5.0 cm)^2(10.0 cm) = 785.4 cm^3
The radius and height are both given to two significant figures, so the answer should also be reported to two significant figures. Therefore, the volume of the cylinder can be determined to 780 cm^3.
Explanation:
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On a brisk walk, a person burns about 331 Cal/h. If the brisk walk were done at 3.0 mi/h, how far would a person have to walk
to burn off 1 lb of body fat? (A pound of body fat stores an amount of chemical energy equivalent to 3,500 Cal.)
mi?
Answers
Answer:
32mi
Explanation:
If 1lb contains 3,500 Cal
It means the number of hours required to burn 3500cal would be;
3500/331 = 10.57hours
But a brisk walk is 3.0 mi/h,
It means a distance of 3.0 × 10.57 mi would be covered = 31.71 miles
32miles{ approximated to the nearest whole}
Note Distance = speed × time
if p=2i+4j+3k and q=I+5j-2k,find P×q.
Answers
Answer:
\(p\times q=-23i+7j+6k\)
Explanation:
We are given that
p=2i+4j+3k
q=i+5j-2k
We have to find pxq
We know that
\(p\times q=\begin{vmatrix} i&j &k\\ 2&4 & 3\\ 1& 5 & -2\end{vmatrix}\)
\(p\times q=i(-8-15)-j(-4-3)+k(10-4)\)
\(p\times q=-23i+7j+6k\)
Hence,\(p\times q=-23i+7j+6k\)
Based on the diagram, which statement explains how energy is conserved
during this chemical reaction?
A
Reaction progress
Potential energy
of a system
B
OA. The potential energy lost by the reaction system (B) is gained by
the surroundings.
B. The potential energy lost by the reaction system (C) is also lost by
the surroundings.
← PREVIOUS
OC. The potential energy changes indicated by C and B involve energy
lost by the surroundings.
Answers
The potential energy changes indicated by C and B involve energy lost by the surroundings. Therefore, option B is correct.
Potential energy is the energy possessed by an object due to its position or condition. It is often associated with the potential for the object to do work or undergo a change. The concept of potential energy arises from the interactions between objects or within a system.
Potential energy is converted into other forms of energy, such as kinetic energy (energy of motion) when the object or system undergoes a change or is acted upon by external forces.
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Your question is incomplete, most probably the correct answer is this:
Based on the diagram, which statement explains how energy is conserved during this chemical reaction? (A) is also gained by the surroundings. B. The potential energy changes indicated by C and B involve energy lost by the surroundings. C. The potential energy lost by the reaction system (C) is also lost by the surroundings. D. The potential energy lost by the reaction system (B) is gained by the surrounding
A boy slides a book across the floor, using a force of 5 N over a distance of 2
m. What is the kinetic energy of the book after he slides it? Assume there is
no friction.
A. 5 J
B. 10 J
C. 20 J
D. 2.5 J
SUBMIT
Answers
The kinetic energy of the book after it is slids a distance of 2 meters will be 10 Joules.
How to determine the kinetic energy of an object?The work-energy theorem states that "the work done on an object is the change in its kinetic energy".
Hence;
Kinetic energy = work done
Note that: work-done is expressed as:
Work done = f × d
Where f is force applied and d is distance traveled.
Given that:
Force applied f = 5 newton
Distance d = 2 meters
Work done = ?
Plug these values into the above formula and solve for the workdone.
Work done = f × d
Work done = 5N × 2m
Work done = 10Nm
Work done = 10 Joules
Therefore, the kinetic energy is 10 Joules.
Option B) 10 J is the correct answer.
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Marie curie investigation method
Answers
Answer: To isolate the unknown substances, of which only tiny amounts were present, the Curies were the first to use a new method of chemical analysis. They employed various standard (but sometimes demanding) chemical procedures to separate the different substances in pitchblende.
Explanation:
How far can a cyclist travel in 2.5h along a straight road if her
average speed is 18km/h?
A. 45km B. 7.2km
C. 45m D. 7.2m
Answers
Answer:
I think its 45 km
I HOPE ITS RIGHT IF NOT THEN SORRYHAVE A GREAT DAY :)
The cyclist is travelling at an average speed of 18 km/h for 2.5 hours, then the distance covered by the cyclist will be 45 km. Hence, option A is correct.
What is Speed?The amount of the shift in approach per unit of time or the size of the displacement over time for an object can be used to describe speed, which would be a scalar quantity in everyday language and kinematics.
The maximum speed that can be maintained when a time period grows closer to zero is the starting speed.
By dividing the object's distance traveled by the duration of the interval, the mean pace of the object for the given period of time is calculated. Speed and velocity are not always the same thing.
As per the given information in the question,
Total time taken by the cyclist = 2.5 hours
Average speed of the cyclist = 18 km/h.
Then the distance travelled by the cyclist will be,
\(Speed=\frac{Distance}{Time}\)
D = t × s
D = 2.5 × 18
D = 45 km.
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In lab, your instructor generates a standing wave using a thin string of length L = 2.25 m fixed at both ends. You are told that the standing wave is produced by the superposition of traveling and reflected waves, where the incident traveling waves propagate in the +x direction with an amplitude A = 2.55 mm and a speed vx = 14.5 m/s . The first antinode of the standing wave is a distance of x = 37.5 cm from the left end of the string, while a light bead is placed a distance of 18.8 cm to the right of the first antinode. What is the maximum transverse speed vy of the bead? Make sure to use consistent distance units in your calculations.
Answers
Explanation:
The maximum transverse speed vy of the bead can be found using the equation:
vy = Aωcos(kx)
where A is the amplitude of the traveling wave, ω is the angular frequency of the standing wave, k is the wave number of the standing wave, and x is the distance of the bead from the left end of the string.
First, we can find the angular frequency of the standing wave using the equation:
ω = 2πf
where f is the frequency of the standing wave. The frequency of the standing wave can be found using the equation:
f = nv/2L
where n is the harmonic number (which is 2 for the first antinode), v is the speed of the wave (which is the same as the speed of the traveling wave, vx = 14.5 m/s), and L is the length of the string.
Substituting the given values, we get:
f = (2)(14.5 m/s)/(2)(2.25 m) = 6.44 Hz
ω = 2πf = 2π(6.44 Hz) = 40.4 rad/s
Next, we can find the wave number of the standing wave using the equation:
k = nπ/L
where n and L are the same as before.
Substituting the given values, we get:
k = (2)(π)/(2.25 m) = 2.77 rad/m
Finally, we can find the maximum transverse speed vy of the bead using:
vy = Aωcos(kx)
where x is the distance of the bead from the left end of the string, which is 37.5 cm + 18.8 cm = 56.3 cm = 0.563 m.
Substituting the given values, we get:
vy = (2.55 mm)(40.4 rad/s)cos[(2.77 rad/m)(0.563 m)]
vy = (2.55 × 10^-3 m)(40.4 rad/s)cos(1.56 rad)
vy = (1.03 × 10^-1 m/s)
Therefore, the maximum transverse speed vy of the bead is approximately 0.103 m/s.
What is the magnitude of the resultant vector? Round your answer to the nearest tenth. m
Answers
The magnitude of the resultant vector to round the answer to the nearest tenth, we look at the digit in the hundredth's place. If this digit is 5 or greater, we round up. If it is less than 5, we round down.
In the study of physics, we use vectors to represent quantities that have both direction and magnitude. It is often the case that we want to add two or more vectors together to obtain a single vector that represents the net result of these additions. The process of adding two or more vectors together is known as vector addition.The magnitude of the resultant vector is the length of the line that represents it on a scale drawing.
When we add two or more vectors together, the resultant vector is the vector that represents the net result of these additions. To find the magnitude of the resultant vector, we use the Pythagorean theorem, which states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.
In the case of vector addition, the hypotenuse is the resultant vector, and the other two sides are the component vectors. If we have two vectors a and b, the magnitude of the resultant vector is given by the following equation:|R| = √(ax2 + bx2)where R is the resultant vector, a and b are the component vectors, and x is the angle between the vectors.
For example, if the answer is 12.345, we would round it to 12.3.
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If a rocket initially at rest accelerates at a rate of 49.3 m/s/s for 8.7 seconds, its speed will be
decimal place.
Answers
Answer:
428.9 m/s
Explanation:
Vf = at = 49.3 m/s^2 * 8.7 s = 428.9 m/s