What do we mean by length contraction in relativity?
A) It is the idea that if you measure the size of an object moving relative to you, you will find that it is shorter in every direction than it would be at rest. That is, length, width, and height are all shorter for an object when it is moving by you.
B) It is the idea that moving objects look smaller than nonmoving objects, but their sizes have not really changed.
C) It is the idea that if you measure the size of an object moving relative to you, you will find that in the direction of motion it is shorter than it would be at rest, while its size in other directions is unchanged.
D) It is the idea that if you travel very fast, you'll notice yourself getting shorter.
C
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Which of the following is a postulate of special relativity?
A. The laws of physics are the same for all observers in uniformly moving frames of reference B. The relative speed of two objects is the same for all observers C. Physicists can make no measurements in a moving reference frame D. The color of light is the same for all observers
An astronaut lands on a previously unknown planet of radius 2350. km and she measures the acceleration of gravity to be 3.20 m/s2
(a) What is the mass of this new planet? (b) What does the astronaut weigh on this new planet if she weighs 384. N on Earth?
Consider the types of reference frames listed below. (NRF = nonrotating frame) A. A NRF in deep space B. A NRF that is freely floating C. A NRF attached to the earth’s center of mass D. A frame attached to the earth’s surface (or a similarly slowly rotating object) E. A frame moving at a constant velocity relative to one of the frame types described above F. A noninertial frame
Classify each of the frames listed below according to the type of frame it is according to the list above. (a) A NRF attached to Jupiter’s center of mass (b) A NRF attached to a satellite orbiting the earth (c) A frame attached to a car moving with a fixed speed on a straight road (d) A reference frame constructed in a sports stadium (e) A reference frame attached to a roller-coaster car (f) A reference frame attached to a freely falling elevator
How can an old pulsar have a very short pulsar period, say less than 0.03 seconds?
What will be an ideal response?