Questions from College Physics

Q: A spaceship is approaching a space station at a speed of 1

A spaceship is approaching a space station at a speed of 1.8 x 105 m/s. The space station has a beacon that emits green light with a frequency of 6.0 x 1014 Hz. (a) What is the frequency of the beacon...

Q: Police radar guns measure the speed of moving vehicles by transmitting electromagnetic

Police radar guns measure the speed of moving vehicles by transmitting electromagnetic waves at a vehicle and detecting a Doppler shift in the reflected wave. Suppose police radar transmits at a frequ...

Q: A speeder tries to explain to the police that the yellow warning

A speeder tries to explain to the police that the yellow warning lights she was approaching on the side of the road looked green to her because of the Doppler shift. How fast would she have been trave...

Q: A 25.0 - mW laser beam of diameter 2.

A 25.0 - mW laser beam of diameter 2.00 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror.

Q: The intensity of solar radiation at the top of Earth’s atmosphere is

The intensity of solar radiation at the top of Earth’s atmosphere is 1370 W/m3. Assuming 60% of the incoming solar energy reaches Earth’s surface and assuming you absorb 50% of the incident energy, ma...

Q: A 200. - Ω resistor is connected in series with a

A 200. - Ω resistor is connected in series with a 5.0 - μF capacitor and a 60 - Hz, 120 - V rms line. If electrical energy costs $0.080/ kWh, how much does it cost to leave this circuit connected for...

Q: A virtual image is often described as an image through which light

A virtual image is often described as an image through which light rays don’t actually travel, as they do for a real image. Can a virtual image be photographed?

Q: In an RLC series circuit that includes a source of alternating current

In an RLC series circuit that includes a source of alternating current operating at fixed frequency and voltage, the resistance R is equal to the inductive reactance. If the plate separation of the pa...

Q: As a way of determining the inductance of a coil used in

As a way of determining the inductance of a coil used in a research project, a student first connects the coil to a 12.0 - V battery and measures a current of 0.630 A. The student then connects the co...

Q: (a) What capacitance will resonate with a one - turn

(a) What capacitance will resonate with a one - turn loop of inductance 400. pH to give a radar wave of wavelength 3.0 cm? (b) If the capacitor has square parallel plates separated by 1.0 mm of air, w...