1. A 1000 N box is pushed across an icy surface at a constant velocity. The icy surface has a 0.05 coefficient of kinetic friction. How much work is done in pushing the crate 1000 m?

a. 5.5*10³J

b. 2.5*10⁴J

*c. 5.0*10⁴J

d. 5.9*10⁵J

e. 9.5*10⁵J

2. A bullet with a mass of 2.5 grams, with a speed of 350 m/s, hits and embeds itself in the trunk of a tree. The tree exerts an average force of 250 N on the bullet. What is the distance the bullet travels inside the trunk?

a. 0.27 m

b. 0.54 m

*c. 0.61 m

d. 1.1 m

e. None of the above

3. A box is pulled on a frictionless surface with a force of 34 N at an angle of 47^oabove the horizontal. If it is moved a distance of 10 m, how much work is done?

a. 185 J

*b. 232 J

c. 230J

d. 460 J

4. A car with a mass of 1800 kg is traveling at 22.0 m/s. The car slows and stops. How much work is done by the friction force against the wheels?

a. 1.98 x 10⁴joules

b. 3.60 x 10⁵joules

c. 4.50 x 10⁵joules

*d. 4.36 x 10⁵joules

e. None of the above

5. A crate that weighs 10 N is acted on by a horizontal force, F, and moves at constant speed on a horizontal floor. The crate to surface coefficient of friction is 0.25. What is the work done by F in moving the crate 10 m?

a. 0 J

b. 2 J

c. 10 J

*d. 25 J

e. 96 J

f. None of the above

6. 100 J of work was done to increase the kinetic energy of a 3.1 kg mass. If the object is initially at rest, what is its speed now?

a. 32.3 m/s

b. 56 m/s

*c. 8.0 m/s

d. 7.7 m/s

e. None of the above

7. A 49.0 N crate is placed at the top of a 6 m long ramp. The ramp is inclined at 30º to the horizontal. The frictional force between the crate and the ramp is 9.5 N. What is the velocity of the cart at the bottom of the ramp?

a. 10.8 m/s

b. 5.0 m/s

c. 4.5 m/s

*d. 6.0 m/s

8. The speed of a 5.5 kg ball is 6.0 m/s. How much work must be done on the ball for its speed to increase to 10 m/s?

a. 44 J

b. 99 J

*c. 176 J

d. 275 J

e. 374 J

f. None of the above

9. A force of 8 N pushes a 2 kg object at 3 m/s. Find the distance the object travels as its speed is increased from 3 m/s to 7 m/s.

a. 0.4 m

*b. 2.0 m

c. 3.0 m

d. 4 m

e. None of the above

10. A mass is accelerated from rest to a speed of v_o. The amount of work done is W_o.How much additional work required to increase its speed from v₀to 3v₀?

a. 2 W

*b. 5 W

c. 4 W

d. 3 W

11. Joe and Sue are pushing against a car. Joe stops after 20 min, while Sue pushes for 10 min longer. How much work does each person do?

a. Sue does 50% more work than Joe

b. Joe does 50% more work than Sue

c. Sue does 75% more work than Joe

*d. Neither Joe nor Sue does any work