AnswersPhysics IKinetic Energy

Pretest Answers

9 verified answers2 views
2
Free Preview

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 and velocity are each reduced by one-half.
C
Mass is doubled, and velocity is reduced by one-half.
D
Mass and velocity are each doubled.
3
Free Preview

Which formula can be used to find velocity if kinetic energy and mass are known?

A
v is equal to square root of cap k cap e m end root
B
v is equal to square root of the fraction with numerator 2 cap k cap e and denominator m end root
C
v is equal to square root of 2 m over cap k cap e end root
D
v is equal to square root of 1 half cap k cap e m end root
4

The work-energy theorem states that the work done on an object is equal to a change in which quantity?

A
displacement
B
potential energy
C
mass
D
kinetic energy
5

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 f squared minus v sub i 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 i squared minus v sub f squared close paren
6

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 2 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 1 half 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 2 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 1 half m open paren v sub f squared minus v sub i squared close paren
7

Which formula can be used to find velocity if kinetic energy and mass are known?

A
v is equal to square root of 1 half cap k cap e m end root
B
v is equal to square root of 2 m over cap k cap e end root
C
v is equal to square root of the fraction with numerator 2 cap k cap e and denominator m end root
D
v is equal to square root of cap k cap e m end root
8

What is the kinetic energy of a 620 point 0 kilograms roller coaster moving with a velocity of 9.00 meters per second ? Round to 3 significant figures.

A
5 comma 580 cap j
B
50 comma 200 cap j
C
2 comma 790 cap j
D
25 comma 100 cap j
9

What does it mean when work is positive?

A
Kinetic energy is greater than velocity.
B
The environment did work on an object.
C
Velocity is greater than kinetic energy.
D
An object did work on the environment.
10

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

Did you find these answers helpful?

More from this Course

lesson pretest
10 verified answers

Pretest

lesson pretest
10 verified answers

Pretest

lesson pretest
10 verified answers

Pretest

Pretest Answers — Physics I