1. Now you are trying to melt 5-g of ice at 0 ^oC. How much heat is needed to completely melt the ice? Assume that specific heat capacity of ice is 0.5 cal/(g^oC) and the latent heat of fusion of water is 335 J/g.

2.Initially, car A has four times the kinetic energy that car B has. Both are braked to a stop; both have the same amount of braking force. Car B will stop in ____________ as car A. (Hint: W=Fd=KE).

3.A 50-kg boy sits on a see-saw 1.0 m from the center where the pivot point is, and a 20-kg dog is put on a seat on the other side of the see-saw to balance it. At what distance should the dog's seat be installed from the pivot?

4. A ball of mass 10 kg, moving to the west at a speed of 1.8 m/s, collides head-on with a stationary ball of a smaller diameter and of mass 1.0 kg. After the collision, the 1-kg ball moves with a speed of 2.0 m/s to the west. Which of the following is then true? (Hint: conservation of momentum, p10kg,initial = p10kg,final + p1kg, final ).

5.The purpose of an air bag in an auto is to

6.When you attach at a tip of a hose a nozzle of smaller cross section than that of the hose to water your garden, the water from the hose reaches further away from you than when you don't attach the nozzle. This is because

7. If you add 3 calories of heat to 1 gram of water, how much is the change in temperature of the water?

8.Mike drops an object whose mass is 10 kg from a window 15 m high above the ground. When this object reaches the ground, what is the velocity of the object? (Hint: conservation of energy, KE + PE is constant).

9.The density of argon gas is much smaller than that of air. If you inflate a balloon with argon gas in a room,

10. If a 0.010-kg grasshopper to jump with kinetic energy of 0.015 J, how high will it reach?

`11. If you hold a sheet of paper vertically and blow air just to the left side of the paper, the paper will

12.There is a cylinder container of radius 1 m and of height 1 m, holding water. A metal lid is touching the water surface. If you put 10 kg of weight on the lid, what is the increase in water pressure at the bottom of the cylinder?

13.A gun is made of a material heavier than a bullet. For such a gun

14.A SUV hits a passenger car at rest from the back and after the collision they starts to move together. In this situation, what quantity is conserved?

15.In dry hot area such as Greece, outside walls of houses are painted in

16.Block A of mass 85 kg is moving with a velocity at 10 m/s to the right, while Block B of mass 100 kg is moving with a velocity at 9 m/s to the left. Which description describes the situation best?

17.You drink a half bottle of water at a mountain top and close the lid tightly before you go down the mountain. When you reach the foot of the mountain, you notice that the bottle is squeezed to a smaller volume. This is because

18.You are pumping air into a tennis ball. First you pump in 0.0005 m3 of air from outside pump at 1 atmospheric pressure, and then compress the air inside the pump to 0.00025 m3. What is the pressure of the compressed air inside pump?

19.A 12-kg rock is falling with a speed at 4 m/s and a 3.0-kg wooden block is shot upward with a speed at 10.0 m/s. The total kinetic energy of the roack and the block is

20.Block A of mass 10 kg is moving horizontally to the right with a constant speed. Block B of mass 5 kg is moving horizontally to the left with a constant speed. Which description is correct?