Questions from College Physics

Q: If you were asked to design a capacitor in which small size

If you were asked to design a capacitor in which small size and large capacitance were required, what would be the two most important factors in your design?

Q: Two light-bulbs are each connected to a voltage of 120

Two light-bulbs are each connected to a voltage of 120 V. One has a power of 25 W, the other 100 W. (a) Which light-bulb has the higher resistance? (b) Which light-bulb carries more current?

Q: Earth’s surface absorbs an average of about 960. W/m2

Earth’s surface absorbs an average of about 960. W/m2 from the Sun’s irradiance. The power absorbed is Pabs = (960. W/m2) (Adisc), where Adisc = πR2E is Earth’s projected area. An equal amount of powe...

Q: A wood stove is used to heat a single room. The

A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of 40.0 cm and a length of 50.0 cm, and operates at a temperature of 400.°F. (a) If the temperature of th...

Q: The highest recorded waterfall in the world is found at Angel Falls

The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single waterfall has a height of 807 m. If water at the top of the falls is at 15.0°C, what is the maximum...

Q: An aluminum rod is 20.0 cm long at 20.

An aluminum rod is 20.0 cm long at 20.0°C and has a mass of 0.350 kg. If 1.00 x 104 J of energy is added to the rod by heat, what is the change in length of the rod?

Q: Lake Erie contains roughly 4.00 x 1011 m3 of water

Lake Erie contains roughly 4.00 x 1011 m3 of water. (a) How much energy is required to raise the temperature of that volume of water from 11.0°C to 12.0°C? (b) How many years would it take to supply t...

Q: An ideal gas is enclosed in a cylinder with a movable piston

An ideal gas is enclosed in a cylinder with a movable piston on top of it. The piston has a mass of 8.00 x 103 g and an area of 5.00 cm2 and is free to slide up and down, keeping the pressure of the g...

Q: (a) Determine the work done on a fluid that expands

(a) Determine the work done on a fluid that expands from i to f as indicated in Figure P12.10. (b) How much work is done on the fluid if it is compressed from f to i along the same path? Figure P12.1...

Q: A balloon holding 5.00 moles of helium gas absorbs 925

A balloon holding 5.00 moles of helium gas absorbs 925 J of thermal energy while doing 102 J of work expanding to a larger volume. (a) Find the change in the balloon’s internal energy. (b) Calculate t...