A measuring stick on a rapidly rotating disk will not appear to shrink if it is oriented along the
A) circumference.
B) radius.
C) either of these
D) neither of these
Answer: B
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Why do you think air is such a poor conductor com-pared to a metal (at normal field strengths)?
A. Air is much less dense than a metal. B. Electrons can travel much farther in a metal before col-liding with an atom than they can in air. C. Air molecules are much bigger than metal atoms. D. Electrons move much more slowly in air. E. Air normally has very few free charge carriers.
Gravitational lensing is caused by ____
a. refraction of light through hot intracluster gas b. stimulated emission of light passing through dark matter c. acceleration of photons by supermassive black holes d. scattering of photons off of thin intergalactic dust e. bending of light rays due to the curvature of space-time around a mass
The average speed of stars relative to the Sun in the solar neighborhood is about 20 km/s. Suppose you discover a star in the solar neighborhood that is moving relative to the Sun at a much higher speed, say 220 km/s
What kind of orbit does this star probably have around the Milky Way? In what part of the galaxy does it spend most of its time? Explain.
Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
a. 12 rad/s2 b. 5.9 rad/s2 c. 8.4 rad/s2 d. 5.4 rad/s2 e. 17 rad/s2