Questions from College Physics

Q: Two immersion heaters, A and B, are both connected to

Two immersion heaters, A and B, are both connected to a 120 V supply. Heater A can raise the temperature of 1.0 L of water from 20.0°C to 90.0°C in 2.0 min, whereas heater B can raise the temperature...

Q: If you shine a laser with a small aperture at the Moon

If you shine a laser with a small aperture at the Moon, diffraction makes the beam spread out and the spot on the Moon is large. Making the aperture smaller only makes the spot on the Moon larger. On...

Q: A man is trying to lift 60.0 kg off the

A man is trying to lift 60.0 kg off the floor by bending at the waist (see Fig. 8.33). Assume that the man's upper body weighs 455 N and the upper body's center of gravity is 38 cm from the sacrum (ta...

Q: A coil has an inductance of 0.15 H and a

A coil has an inductance of 0.15 H and a resistance of 33 Ω. The coil is connected to a 6.0 V ideal battery. When the current reaches half its maximum value: (a) At what rate is magnetic energy being...

Q: Octavio, traveling at a speed of 0.60c, passes

Octavio, traveling at a speed of 0.60c, passes Tracy and her barn. Tracy, who is at rest with respect to her barn, says that the barn is 16 m long in the direction in which Octavio is traveling, 4.5 m...

Q: If 46 m of nichrome wire is to have a resistance of

If 46 m of nichrome wire is to have a resistance of 10.0 Ω at 20°C, what diameter wire should be used?

Q: A 6.20 mH inductor is one of the elements in

A 6.20 mH inductor is one of the elements in an RLC series circuit. When this circuit is connected to a 1.60 kHz sinusoidal source with an rms voltage of 960.0 V, an rms current of 2.50 A lags behind...

Q: The main magnet in an MRI machine is a superconducting solenoid 1

The main magnet in an MRI machine is a superconducting solenoid 1.8 m long and 30 cm in radius. During normal operation, the current through the windings is 100 A, the resistance of the windings is ze...

Q: The solar panels on the roof of a house measure 4.

The solar panels on the roof of a house measure 4.0 m by 6.0 m. Assume they convert 12% of the incident EM wave’s energy to electric energy. (a) What average power do the panels supply when the incid...

Q: A skier starts from rest at the top of a frictionless slope

A skier starts from rest at the top of a frictionless slope of ice in the shape of a hemispherical dome with radius R and slides down the slope. At a certain height h, the normal force becomes zero an...