Question

Q1.Energy is defined as

the ability to do work.

the conservation of displacement.

the distance traveled divided by time.

the time rate of doing work.

Q2.While rearranging a dorm room, a student does 300 J of work in moving a desk 2.0 m. What was the magnitude of the applied horizontal force?

150 N

600 N

0 N

2940 N

Q3.Power

is force divided by time.

is work divided by time.

is work times time.

has the same units as energy.

Q4.How much work is required to lift a 3.00-kg object from the bottom of a 10.0-m-deep well?

294 J

98 J

960 J

45.8 J

Q5.A 25.0-kg child starting from rest slides down a water slide with a vertical height of 20.0 m. Neglecting friction, what is the child’s speed three quarters of the way down the slide’s vertical distance?

8.9 m/s

19.4 m/s

22.3 m/s

17.1A m/s

Q6.A 60-kg student traveling in a car with a constant velocity has a kinetic energy of 1.2 x 10^4 J. What is the speedometer reading of the car in km/h?

59 km/h

36 km/h

72 km/h

98 km/h

Q7.A 154-lb student races upstairs with a vertical height of 6.0 m in 5.0 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity?

820

378

462

950

Q8.How much work is required to lift a 4.0-kg concrete block a height of 2.0 m?

8 J

78 J

128 J

256 J

Q9.Two balls, one with a mass of 5.0 kg and the other with a mass of 7.5 kg, are allowed to fall freely from rest. If friction is ignored, at the end of 2 s they will have

equal forces acting on them.

the same kinetic energy.

the same potential energy.

the same velocity.

Q10.Energy consumption in the United States can be classified in three major categories: residential and commercial, industry, and

		transportation.
		space exploration.
		medical research.
		agriculture.

Answer 1