1) Suppose you sit on a seesaw with your friend. you have a mass of 78 oh and your friend has a mass of 87 kg. Your friend sits 5.2 meters from the fulcrum (middle) of the seesaw. How far do you need to sit from the fulcrum so that the work on either side is equal?

2) volume flow rate is inversely proportional to?

a fluid velocity

b are

c fluid pressure

d density

3) A roller coaster sitting at the top of the highest hill (v= 0 m/s) has maximum____ energy

a) potential

b) kinetic

c) chemical

d) thermal

4) suppose you had a carrot engine with a hot reservoir temperature of 1000 K. If the engine is designed to be 64% efficient. what is the temperature of the cold reservoir?

5) if you submerge a 16kg object in a liquid and it's apparent weight reads 50 N, what is the buoyant force acting on the object?

6) To change the internal energy (U) of a substance, you must always add heat (Q)

true or false?

7) a 4.5 km bridge is built with steel expansion joints (a steel= 0.000016/C) For T= -5C and Tf= 8C how much will the bridge expand? Answer in meters