1. How much work does a person do in pushing a box with a force of 10 N over a distance of 4.0 m in the direction of the force?
(A) 0.4 J
(B) 4.0 J
(C) 40 J
(D) 400 J
(E) 4000 J
2. A person pushes a 10 kg box at a constant velocity over a distance of 4 m. The coefficient of kinetic friction between the box and the floor is 0.3. How much work does the person do in pushing the box?
(A) 12 J
(B) 40 J
(C) 75 J
(D) 120 J
(E) 400 J
3. How much work does the force of gravity do in pulling a 10 kg box down a 30º inclined plane of length 8.0 m? Note that sin 30 = cos 60 = 0.500 and cos 30 = sin 60 = 0.866.
(A) 40 J
(B) 69 J
(C) 400 J
(D) 690 J
(E) 800 J
4. How much work does a person do in pushing a box with a force of 20 N over a distance of 8.0 m in the direction of the force?
(A) 1.6 J
(B) 16 J
(C) 160 J
(D) 1600 J
(E) 16000 J
5. When a car’s speed doubles, what happens to its kinetic energy?
(A) It is quartered
(B) It is halved
(C) It is unchanged
(D) It is doubled
(E) It is quadrupled
6. A worker does 500 J of work on a 10 kg box. If the box transfers 375 J of heat to the floor through the friction between the box and the floor, what is the velocity of the box after the work has been done on it?
(A) 5 m/s
(B) 10 m/s
(C) 12.5 m/s
(D) 50 m/s
(E) 100 m/s
7. A person on the street wants to throw an 8 kg book up to a person leaning out of a window 5 m above street level. With what velocity must the person throw the book so that it reaches the person in the window?
(A) 5 m/s
(B) 8 m/s
(C) 10 m/s
(D) 40 m/s
(E) 50 m/s
Questions 8and 9 refer to a forklift lifting a crate of mass 100 kg at a constant velocity to a height of 8 m over a time of 4 s. The forklift then holds the crate in place for 20 s.
8. How much power does the forklift exert in lifting the crate?
(A) 0 W
(B) 2.0x103 W
(C) 3.2x103 W
(D) 2.0x104 W
(E) 3.2x104 W
9. How much power does the forklift exert in holding the crate in place?
(A) 0 W
(B) 400 W
(C) 1.6x103 W
(D) 4.0x103 W
(E) 1.6x104 W
SATII物理专题分析—Questions of Work, Energy, and Power
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