A celestial object called a pulsar emits its light in short bursts that are synchronized with its rotation. A pulsar in the Crab Nebula is rotating at a rate of 30 revolutions/second. What is the maximum radius of the pulsar, if no part of its surface can move faster than the speed of light (3 × 10^8 m/s)?
1 590 km
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The sequence of steps in which the four forces separated out from a single force after the Big Bang was:
a. first the gravitational force separated from electroweak combined with strong; then electroweak and strong separated; then electroweak separated into weak and electromagnetic. b. first the electroweak force separated out; then gravitation separated out from strong; then electroweak separates into electromagnetic and weak. c. first the strong force separates; then electroweak separates out from gravitational; then electroweak separated into electromagnetic and weak. d. first electroweak force separated; then electroweak separated into electromagnetic and weak; then strong and gravitational separated. e. first gravitational force, electroweak, and strong forces separated into three; then electroweak separated into electromagnetic and weak.
The field lines due to two spheres with like charges are shown by ___.
A. a
B. b
C. c
D. d
If a sound level increases by 30 dB, the intensity increases by a factor of ______________
Fill in the blank(s) with correct word
In which atmospheric layer does all our weather occur?
What will be an ideal response?