Answer the Questions:

1. Let's suppose you are designing a roller coaster. You want the first hill to be 50 meters high. Assuming no friction, how fast will the 2000 kg car be going at the bottom of the first hill?

a. 50 m/s

b. 44.7 m/s

c. 980 m/s

d. 31.3 m/s

2. The input pressure on a hydraulic lift is 1200 Pa. If the output force on the other side is 800 N, what is the output surface area? a. 1.5 m²

b. 0.75 m²

c. 1.2 m²

d. 0.67 m²

3. For linear expansion:

Suppose a metal bar expands 5 cm when it is heated from 10C to 50C. If the same bar is heated from 10C to 100C, the linear expansion will be 10 cm.

a. True

b. False

4. For an ideal gas held at a constant volume, if the temperature is doubled, the pressure will

a. double

b. be 1/4 as much

c. quadruple

d. be half as much

5. For a Carnot engine, if T_hot is five times the magnitude of T_cold, the efficiency of the engine will be

a. 20%

b. 95%

c. 50%

d. 80%

6. If the cross-sectional area of a pipe doubles, the fluid velocity will be reduced by 1/2.

a. True

b. False

7. In an inelastic collision, ___________ is conserved but __________ is not conserved.

a. momentum; kinetic energy

b. kinetic energy; momentum

c. momentum; total energy

d. total energy; momentum