A mass of 40.0 grams is attached to a vertical spring with a spring constant k = 20.0 N/m and lowered slowly until the spring stops stretching. How much does the spring stretch?
A) 0.00200 m
B) 0.0196 m
C) 0.0816 m
D) 0.800 m
E) 0.200 m
B
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Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon. b. most lie beyond dense dust clouds. c. they have only a small surface area from which to emit. d. the peak of their thermal emission is at much shorter wavelengths than visual. e. they have only a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual.
Hydrostatic equilibrium refers to the balance between weight and pressure
a. True b. False Indicate whether the statement is true or false
Why does the Sun emit neutrinos?
A) Convection releases neutrinos, which random walk through the radiation zone. B) The Sun does not emit neutrinos. C) Neutrinos are a by-product of fusion in the Sun's core. D) Solar flares create neutrinos with magnetic fields.
A low-power source of energy could put out a lot of work provided it
A) exerted its power over a very large distance. B) operated for a short time. C) operated for a long time. D) exerted a sufficiently strong force. E) Nonsense-- there is no way that a low-power source can put out a large amount of work.