10. A baseball is hit by the batter horizontally at 40 m/s from a height of 1 m above the ground. How far does the baseball travel horizontally before hitting the ground? a. 1 m b. 10 m c. 18 m d. 25 m 11. What is the angular velocity of the earth in radians/second? a. 1 b. 1.6 X 10 c. 2.7 X 10 d. 7X 10-1 12. How fast is someone moving at the equator if the radius of the earth is 6000 kilometers.? a. 6000 m/s b. 420 m/s c. 1.6 m/s d. 0.42 m/s 13. In the above question, what is the centripetal acceleration of the person on the equator in m/s? a. 60 b. 10 c. 6 d. 0.03 14. You lift a box of weight 120 Newtons from the floor by a height of 2 meters. The work you do in lifting the box is a. 0J b. 24 J c. 240 J d. 24 N 15. A 2 kilogram box is pushed on the floor at a constant velocity of 1 m/s with a force of 10 N. How much force of friction is acting on the box? a. ON b. 2 N c. 10 N d. 20 N 16. What is the value of the coefficient of friction between the floor and the box in Question (15)? a. 0 b. 0.2 c. 0.5 d. 1 17. A box of 10 kg at rest is pushed by a net force of 10 N for 5 s. The Kinetic Energy of the box at the end of 5 seconds is a. 0 J b. 10 J c. 125 J d. 200 J 18. A bathroom scale spring compresses by 0.5 cm when a 100 kg person stands on it. What is the elastic constant of this spring?