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Kinetic Energy — Quiz Answers

10 verified answers
1
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Which best describes Lenny’s error?

A
In Step 1, he should have found the square root of 400 cap j instead of squaring 8 meters per second .
B
In Step 1, he should have multiplied 8 meters per second by 2 instead of squaring it.
C
In Step 2, he should have divided 64 the fraction with numerator m squared and denominator s squared by 400 cap j instead of dividing 400 cap j by 64 the fraction with numerator m squared and denominator s squared .
D
In Step 3, he should have multiplied 6 point 2 5 cap j per the fraction with numerator m squared and denominator s squared by 2 instead of dividing it by 2 .
2
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Four vehicles are traveling on the same road. Which vehicle most likely has the greatest kinetic energy?

A
a motorcycle traveling at a velocity of 25 meters per second
B
a minivan traveling at a velocity of 10 meters per second
C
a pickup truck traveling at a velocity of 25 meters per second
D
a compact car traveling at a velocity of 10 meters per second
3

A 60 point 0 kilograms runner is moving at 6.00 meters per second and speeds up to 9.00 meters per second The runner’s change in kinetic energy is 1 comma 350 cap j How much work was done?

A
negative 1 comma 350 cap j
B
2 comma 430 cap j
C
negative 2 comma 430 cap j
D
1 comma 350 cap j
4

A 20 point 0 kilograms object is at rest, and then speeds up to 16.0 meters per second How much work was done on this system?

A
2 comma 880 cap j
B
5 comma 120 cap j
C
2 comma 560 cap j
D
320 cap j
5

Which best summarizes a concept related to the work-energy theorem?

A
When work is positive, the environment does work on an object.
B
When work is negative, the kinetic energy in a system remains constant.
C
When work is positive, the kinetic energy in a system remains constant.
D
When work is negative, the environment does work on an object.
6

If all else is constant, which would cause the greatest increase in kinetic energy of a moving object?

A
Mass is reduced by one-half, and velocity is doubled.
B
Mass is doubled, and velocity is reduced by one-half.
C
Mass and velocity are each reduced by one-half.
D
Mass and velocity are each doubled.
7

According to the work-energy theorem, the amount of work done can be determined using which formula?

A
cap w is equal to triangle cap k cap e is equal to 1 half m open paren v sub i squared minus v sub f squared close paren
B
cap w is equal to triangle cap k cap e is equal to 2 m open paren v sub i squared minus v sub f squared close paren
C
cap w is equal to triangle cap k cap e is equal to 1 half m open paren v sub f squared minus v sub i squared close paren
D
cap w is equal to triangle cap k cap e is equal to 2 m open paren v sub f squared minus v sub i squared close paren
8

If all else is constant, which would cause the greatest increase in kinetic energy of a moving object?

A
Mass and velocity are each reduced by one-half.
B
Mass is doubled, and velocity is reduced by one-half.
C
Mass is reduced by one-half, and velocity is doubled.
D
Mass and velocity are each doubled.
9

Which shows the order of the objects’ kinetic energies, from least to greatest?

A
W, Y, Z, X
B
W, Y, X, Z
C
X, Z, Y, W
D
Z, X, Y, W
10

At which labeled points would the skateboarder have the most kinetic energy?

A
X and Y
B
Y and Z
C
W and X
D
W and Z

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Kinetic Energy — Quiz Answers — Physics