Which two factors determine a star's luminosity?
A) radius and surface temperature
B) radius and distance from Earth
C) surface temperature and distance from Earth
D) mass and radius
E) mass and surface temperature
A) radius and surface temperature
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Over time, the star-gas-star cycle leads the gas in the Milky Way to ________
A) become denser and hotter B) have a greater abundance of heavy elements C) have a lower abundance of heavy elements D) become denser and have a greater abundance of heavy elements
A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
A. There is an residual upward force from the hand on each ball. B. There is a greater residual force from the hand on A than there is on B. C. Only gravity acts on B but there is an additional residual force from the hand on A. D. There is an additional downwards force besides gravity on each ball. E. The only force acting on each ball is the gravitational force.
A hot pizza contains
a. heat. b. internal energy. c. temperature. d. work. e. none of the above.
Wave speed and wave frequency are two terms that are
A) basically the same. B) fundamentally different from each other. C) opposites. D) reciprocals.