Questions from College Physics

Q: A dish antenna with a diameter of 20.0 m receives

A dish antenna with a diameter of 20.0 m receives (at normal incidence) a radio signal from a distant source, as shown in Figure P21.73. The radio signal is a continuous sinusoidal wave with amplitude...

Q: A particular inductor has appreciable resistance. When the inductor is connected

A particular inductor has appreciable resistance. When the inductor is connected to a 12 - V battery, the current in the inductor is 3.0 A. When it is connected to an AC source with an rms output of 1...

Q: One possible means of achieving space flight is to place a perfectly

One possible means of achieving space flight is to place a perfectly reflecting aluminized sheet into Earth’s orbit and to use the light from the Sun to push this solar sail. Suppose such a sail, of a...

Q: The U.S. Food and Drug Administration limits the radiation

The U.S. Food and Drug Administration limits the radiation leakage of microwave ovens to no more than 5.0 mW/cm2 at a distance of 2.0 in. A typical cell phone, which also transmits microwaves, has a p...

Q: A boy floating on a pond watches a fish swim away from

A boy floating on a pond watches a fish swim away from him as in Figure P22.44. If the fish is 2.25 m beneath the surface, for what maximum distance d will he be able to see the fish? Neglect the heig...

Q: A layer of ice having parallel sides floats on water. If

A layer of ice having parallel sides floats on water. If light is incident on the upper surface of the ice at an angle of incidence of 30.0°, what is the angle of refraction in the water?

Q: A ray of light is incident at an angle 30.0

A ray of light is incident at an angle 30.0° on a plane slab of flint glass surrounded by water. (a) Find the refraction angle. (b) Suppose the index of refraction of the surrounding medium can be adj...

Q: The level of water in a clear, colorless glass can easily

The level of water in a clear, colorless glass can easily be observed with the naked eye. The level of liquid helium in a clear glass vessel is extremely difficult to see with the naked eye. Explain....

Q: When a man stands near the edge of an empty drainage ditch

When a man stands near the edge of an empty drainage ditch of depth 2.80 m, he can barely see the boundary between the opposite wall and bottom of the ditch as in Figure P22.47a. The distance from his...

Q: A light ray of wavelength 589 nm is incident at an angle

A light ray of wavelength 589 nm is incident at an angle θ on the top surface of a block of polystyrene surrounded by air, as shown in Figure P22.48. (a) Find the maximum value of Î...