Questions from College Physics

Q: Two aluminum blocks are in thermal contact. (a)

Two aluminum blocks are in thermal contact. (a) Are the blocks necessarily in physical contact? Explain. (b) If they have the same temperature, do they necessarily have the same internal energy? Exp...

Q: At the surface of a freshwater lake the pressure is 105 kPa

At the surface of a freshwater lake the pressure is 105 kPa. (a) What is the pressure increase in going 35.0 m below the surface? (b) What is the approximate pressure decrease in going 35 m above th...

Q: A wall that is 2.74 m high and 3.

A wall that is 2.74 m high and 3.66 m long has a thickness composed of 1.00 cm of wood plus 3.00 cm of insulation (with the thermal conductivity approximately of wool). The inside of the wall is 23.0°...

Q: A 60.0 g piece of ice slides 5.00

A 60.0 g piece of ice slides 5.00 m down an icy roof inclined at 27.0° to the horizontal. The magnitude of its acceleration is 4.10 m/s2. All the ice is at 0°C. How much ice melts?

Q: Boiling water in an aluminum pan is being converted to steam at

Boiling water in an aluminum pan is being converted to steam at a rate of 10.0 g/s. The flat bottom of the pan has an area of 325 cm2 and the pan's thickness is 3.00 mm. If 27.0% of all heat that is t...

Q: A 75 kg block of ice at 0.0°C

A 75 kg block of ice at 0.0°C breaks off from a glacier, slides along the frictionless ice to the ground from a height of 2.43 m, and then slides along a horizontal surface consisting of gravel and di...

Q: A satellite is placed in a noncircular orbit about Earth. The

A satellite is placed in a noncircular orbit about Earth. The farthest point of its orbit (apogee) is 4.0 Earth radii from the center of Earth, while its nearest point (perigee) is 2.0 Earth radii fro...

Q: A locomotive pulls a train of 10 identical cars, on a

A locomotive pulls a train of 10 identical cars, on a track that runs east-west, with a force of 2.0 × 106 N directed east. What is the force with which the last car to the west pulls on the rest of t...

Q: Your hot water tank is insulated, but not very well.

Your hot water tank is insulated, but not very well. To reduce heat loss, you wrap some old blankets around it. With the water at 81°C and the room at 21°C, a thermometer inserted between the outside...

Q: A hotel room is in thermal equilibrium with the rooms on either

A hotel room is in thermal equilibrium with the rooms on either side and with the hallway on a third side. The room loses heat primarily through a 1.30 cm thick glass window that has a height of 76.2...