A 2 500-kg car is moving at 2.30 m/s. How fast must a 1.5-kg toy car be moving so that the two have the same kinetic energy?
a. 61.9 m/s
b. 3.97 m/s
c. 93.9 m/s
d. 6 610 m/s
[Ques. 2] A 1 300-kg automobile moving at 21 m/s has the brakes applied with a deceleration of 3.0 m/s2 . How far does the car travel before it stops?
a. 7.4E+1 m
b. 1.5E+2 m
c. 2.9E+5 m
d. 2.3E+4 m
e. 4.3E+2 m
[Ques. 3] A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4
b. 3/8
c. 7/16
d. 9/16
e. 3/4
[Ques. 4] A horizontal force of 200 N is applied to a 55.0-kg cart across a 15.0-m level surface. If the cart accelerates at 2.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
a. 4.7E+3 J
b. 1.4E+3 J
c. 3.0E+3 J
d. 9.0E+1 J
e. 3.1E+2 J
[Ques. 5] A very light cart holding a 100-N box is moved at constant velocity across a 10-m level surface. What is the net work done in the process?
a. zero
b. 1/10 J
c. 10 J
d. 100 J
e. 1 000 J
[Ques. 6] If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
a. It decreases.
b. It increases.
c. It remains constant.
d. It cannot be determined from the information given.
[Ques. 7] If both mass and velocity of a ball are tripled, the kinetic energy is increased by a factor of:
a. 3.
b. 6.
c. 9.
d. 27.
[Ques. 8] What is the kinetic energy of a 0.240-kg baseball thrown at 37.5 m/s?
a. 338 J
b. 4.50 J
c. 169 J
d. 9.00 J
e. 37.7 J
[Ques. 9] Which of the following is that form of energy associated with an object's location in a conservative force field?
a. potential
b. thermal
c. bio-chemical
d. kinetic
[Ques. 10] Which of the following is that form of energy associated with an object's motion?
a. potential
b. thermal
c. bio-chemical
d. kinetic
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