Questions from College Physics

Q: A glass windowpane in a home is 0.62 cm thick

A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.0 m x 2.0 m. On a certain day, the indoor temperature is 25°C and the outdoor temperature is 0°C. (a) What is the rate at which en...

Q: A pond with a flat bottom has a surface area of 820

A pond with a flat bottom has a surface area of 820 m2 and a depth of 2.0 m. On a warm day, the surface water is at a temperature of 25°C, while the bottom of the pond is at 12°C. Find the rate at whi...

Q: The thermal conductivities of human tissues vary greatly. Fat and skin

The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m · K and 0.020 W/m · K, respectively, while other tissues inside the body have conductivitie...

Q: A steam pipe is covered with 1.50-cm-

A steam pipe is covered with 1.50-cm-thick insulating material of thermal conductivity 0.200 cal/cm · °C · s. How much energy is lost every second when the steam is at 200.°C and the surrounding air i...

Q: The average thermal conductivity of the walls (including windows) and

The average thermal conductivity of the walls (including windows) and roof of a house in Figure P11.46 is 4.8 x 10-4 kW/m · °C, and their average thickness is 21.0 cm. The hou...

Q: Consider two cooking pots of the same dimensions, each containing the

Consider two cooking pots of the same dimensions, each containing the same amount of water at the same initial temperature. The bottom of the first pot is made of copper, while the bottom of the secon...

Q: A thermopane window consists of two glass panes, each 0.

A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed layer of air in between. (a) If the inside surface temperature is 23°C and the outside surface temperatu...

Q: A 12 - V battery is connected across a device with variable

A 12 - V battery is connected across a device with variable resistance. As the resistance of the device increases, determine whether the following quantities increase, decrease, or remain unchanged. I...

Q: A copper rod and an aluminum rod of equal diameter are joined

A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The temperature of the free end of the copper rod is held constant at 100.°C and that of the far end o...

Q: A person’s basal metabolic rate (BMR) is the rate at

A person’s basal metabolic rate (BMR) is the rate at which energy is expended while resting in a neutrally temperate environment. A typical BMR is 7.00 x 106 J/day. Convert this BMR to units of (a) Wa...