Why do white dwarfs have high temperatures?
A. chemical reactions on their surfaces
B. heat left over from their formation
C. nuclear fusion in their cores
D. frictional heating from motions inside the white dwarfs
Answer: B
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A spring with a force constant of 2.00 N/m is attached to a mass of 75.0 g. The system has a small amount of damping. If the amplitude of the oscillations decreases from 10.0 mm to 5.00 mm in 15.0 s, what is the magnitude of the damping constant?
A) 0.00693 Ns/m B) 0.0462 Ns/m C) 0.00762 Ns/m D) 0.0100 Ns/m E) 0.00857 Ns/m
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of the special relativistic effect of __________
Fill in the blank(s) with correct word
If the first maximum of one circular diffraction pattern passes through the center of a second diffraction pattern, the two sources responsible for the pattern will appear to be a single source
Indicate whether the statement is true or false
What is the least value for an index of refraction?
A. 0 B. 0.5 C. 1 D. just less than 1 E. (1/2)1/2