Which of the following could have been habitable if the Sun had been twice as massive?
A. Mercury
B. Neptune
C. Venus
D. Pluto
E. Jupiter's moons
Ans: E. Jupiter's moons
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Hypernovae are
a. supernovae that occur when two red dwarfs collide. b. supernovae that occur when 10-solar-mass stars explode. c. supernovae that occur when stars more massive than 25 solar masses explode. d. one theory to explain the production of gamma-ray bursters. e. supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.
Torque: Five forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing a counter-clockwise torque about point P? (There could be more than one correct choice.)
A. force A B. force B C. force C D. force D E. force E
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating clockwise and then counterclockwise.
State the relationship between velocity, wavelength, and frequency of a wave