Questions from College Physics

Q: An observer moving at a speed of 0.995c relative to

An observer moving at a speed of 0.995c relative to a rod (Fig. P26.55) measures its length to be 2.00 m and sees its length to be oriented at 30.0° with respect to its direction of motion....

Q: An alien spaceship traveling 0.600c toward Earth launches a landing

An alien spaceship traveling 0.600c toward Earth launches a landing craft with an advance guard of purchasing agents. The lander travels in the same direction with a velocity 0.800c relative to the sp...

Q: An astronaut at rest on Earth has a heart rate of 70

An astronaut at rest on Earth has a heart rate of 70. beats/min. When the astronaut is traveling in a spaceship at 0.90c, what will this rate be as measured by (a) An observer also in the ship and (b)...

Q: Suppose you are observing the interference pattern formed by a Michelson interferometer

Suppose you are observing the interference pattern formed by a Michelson interferometer in a laboratory and a joking colleague holds a lit match in the light path of one arm of the interferometer. Wil...

Q: The average lifetime of a pi meson in its own frame of

The average lifetime of a pi meson in its own frame of reference (i.e., the proper lifetime) is 2.6 x 10-8 s. If the meson moves with a speed of 0.98c, what is (a) Its mean lifetime as measured by an...

Q: An astronaut is traveling in a space vehicle that has a speed

An astronaut is traveling in a space vehicle that has a speed of 0.500c relative to Earth. The astronaut measures his pulse rate at 75.0 beats per minute. Signals generated by the astronaut’s pulse ar...

Q: A muon formed high in Earth’s atmosphere travels toward Earth at a

A muon formed high in Earth’s atmosphere travels toward Earth at a speed v = 0.990c for a distance of 4.60 km as measured by an observer at rest with respect to Earth. It then decays into an electron,...

Q: (a) Use conceptual arguments to show that the intensity of

(a) Use conceptual arguments to show that the intensity of light (energy per unit area per unit time) reaching the film in a camera is proportional to the square of the reciprocal of the f - number as...

Q: A certain type of film requires an exposure time of 0.

A certain type of film requires an exposure time of 0.010 s with an f/11 lens setting. Another type of film requires twice the light energy to produce the same level of exposure. What f - number does...

Q: A certain camera lens has a focal length of 175 mm.

A certain camera lens has a focal length of 175 mm. Its position can be adjusted to produce images when the lens is between 180. mm and 210. mm from the plane of the film. Over what range of object di...