Questions from College Physics

Q: A copper rod has one end in ice at a temperature of

A copper rod has one end in ice at a temperature of 0°C, the other in boiling water. The length and diameter of the rod are 1.00 m and 2.00 cm, respectively. At what rate in grams per hour does the ic...

Q: While camping, some students decide to make hot chocolate by heating

While camping, some students decide to make hot chocolate by heating water with a solar heater that focuses sunlight onto a small area. Sunlight falls on their solar heater, of area 1.5 m2, with an in...

Q: When a mercury manometer is connected to a gas main, the

When a mercury manometer is connected to a gas main, the mercury stands 40.0 cm higher in the tube that is open to the air than in the tube connected to the gas main. A barometer at the same location...

Q: When a roller coaster takes a sharp turn to the right,

When a roller coaster takes a sharp turn to the right, it feels as if you are pushed toward the left. Does a force push you to the left? If so, what is it? If not, why does there seem to be such a for...

Q: A hiker is wearing wool clothing of 0.50 cm thickness

A hiker is wearing wool clothing of 0.50 cm thickness to keep warm. Her skin temperature is 35°C and the outside temperature is 4.0°C. Her body surface area is 1.2 m2. (a) If the thermal conductivity...

Q: Five ice cubes, each with a mass of 22.0

Five ice cubes, each with a mass of 22.0 g and at a temperature of−50.0°C, are placed in an insulating container. How much heat will it take to change the ice cubes completely into steam?

Q: Find the temperature drop across the epidermis (the outer layer of

Find the temperature drop across the epidermis (the outer layer of skin) under these conditions: the rate of heat flow via conduction through a 10.0 cm2 area of the epidermis is 50 mW; the epidermis i...

Q: A 10.0 g iron bullet with a speed of 4

A 10.0 g iron bullet with a speed of 4.00 × 102 m/s and a temperature of 20.0°C is stopped in a 0.500 kg block of wood, also at 20.0°C, which is fixed in place. (a) At first all of the bullet's kinet...

Q: One cross-country skier is wearing a down jacket that is

One cross-country skier is wearing a down jacket that is 2.0 cm thick. The thermal conductivity of goose down is 0.025 W/(m·K). Her companion on the ski outing is wearing a wool jacket that is 0.50 cm...

Q: A woman of mass 51 kg is standing in an elevator.

A woman of mass 51 kg is standing in an elevator. (a) If the elevator floor pushes up on her feet with a force of 408 N, what is the acceleration of the elevator? (b) If the elevator maintains const...