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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At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
A. 3.8 m/s B. 3.4 m/s C. 5.0 m/s D. 4.4 m/s E. 4.6 m/s
When a star finally runs out of hydrogen to fuse in its central core
A) it grows smaller and dimmer, becoming a brown dwarf B) it grows larger and brighter, becoming a giant or supergiant star C) it grows smaller and dimmer becoming a white dwarf D) it remains the same size but grows brighter
A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 1.50 m/s. What emf is induced across the ends of the wire?
a. 2.25 V b. 1.00 V c. 0.600 V d. zero
When a current-carrying wire is bent into a loop, its magnetic field inside the loop
A) weakens. B) becomes concentrated. C) cancels. D) none of the above