What causes the bubbling pattern of granulation that we see in the Sun's photosphere?
A) underlying convection
B) sunspots
C) dark areas of the pattern have larger concentrations of carbon
D) dust particles
E) magnetic fields
A) underlying convection
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As a white dwarf cools its radius will not change because
a. pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing. b. pressure does not depend on temperature for a white dwarf because the electrons are degenerate. c. pressure does not depend on temperature because the white dwarf is too hot. d. pressure does not depend on temperature because the star has exhausted all its nuclear fuels. e. material accreting onto it from a companion maintains a constant radius.
An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
A) It is reduced by a factor of two. B) It is reduced by a factor of four. C) It increases by a factor of two. D) It increases by a factor of four. E) It doesn't change.
A baseball player is running to second base at 5.03 m/s. When he is 4.80 m from the plate he goes into a slide. The coefficient of kinetic friction between the player and the ground is 0.180, and the coefficient of static friction is 3.14
What is his speed when he reaches the plate? A) 1.96 m/s B) 2.56 m/s C) 4.47 m/s D) 2.89 m/s E) He stops before reaching the plate.
When radiation from an object passes through the interstellar medium:
a. the object appears dimmer; b. the object appears bluer; c. the object appears bluer and dimmer; d. the object appears redder and dimmer.