Mechanics | Relativity Answers

An equal amount of heat is transferred to two containers containing water at the same temperature. If the
second container contains three times as many water molecules as the first, how do the final temperatures
compare?

Describe the three methods of heat transfer and give an example for each.

A liter of water is used to cool some electronics. If 1000 J of heat is given off by the electronics, by what
temperature does the water increase? One liter of water has a mass of 1 kg and a specific heat of 4.184 J/(g
°C).

The temperature of a 1 m long aluminum rod is 20° C. If the temperature is increased to 70° C, what is the
length of the rod?

Water flows through a 4 cm diameter garden hose at a velocity of 2 m/s. What is the velocity of the water if a
nozzle is used with a diameter of 0.5 cm?

Air in a cylinder is compressed to one-tenth its original volume with no change in temperature. What is the
change in its pressure?

In the hydraulic pistons shown in the sketch, the small piston has a diameter of 2 cm and the large piston has
a diameter of 6 cm. How much more force can the larger piston exert, compared with the force applied to the
smaller piston?

I know there is no sketch here but the picture has is shaped just like a U

In the deepest part of Lake Superior, the water depth is 406 m. What is the pressure at this depth?

A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge,
the barge sinks a few centimeters deeper. How much deeper does the barge lower?

Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure
on your finger?