Two blocks, M1 > M2, having the same speed, move from a frictionless surface onto a surface having friction coefficient ?k
3
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Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster?
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass. B) Temperature is always directly related to mass, which is why massive objects are always hotter than less massive objects. C) The temperature of the gas tells us the gas density, so we can use the density to determine the cluster's mass. D) The question is nonsense; gas temperature cannot possibly tell us anything about mass.
The figure is a graph of 
for a car. Solve graphically for the distance traveled from t = 10 s to t = 15 s.
A. 75 m
B. 70 m
C. 67 m
D. 69 m
Which two classes of objects were critical to the Shapley-Curtiss Debate of 1920?
A) white dwarfs and red giants B) open clusters and emission nebulae C) globular clusters and spiral nebulae D) emission nebulae and spiral nebulae E) planetary nebulae and white dwarfs
Two isotopes have the same
a. mass number b. neutron number c. atomic number d. quantum number e. none of the above