What part of a comet always points most directly away from the Sun?
A) the coma
B) the jets of gas
C) the dust tail
D) the plasma tail
E) the nucleus
D
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The velocity of longitudinal waves in a long brass rod is 3,260 m/s. If the density of brass is 8,470 
then what is the tensile modulus of brass?
A. 
B. 
C. 
D. 
E. 
The Ptolemaic model of the universe
A) explained and predicted the motions of the planets with deferents and epicycles. B) is the basis of our modern cosmology. C) could not account for the stellar parallax observed by Hipparchus. D) describes the orbits of the planets as being ellipses, not circles. E) always kept Mars and Mercury between the Earth and Sun.
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80. g,
what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?
If a moving object hits a still object, what happens to the momentum of the moving object?
a. The momentum of the moving object is increased by the force of the collision. b. The momentum of the moving object goes to zero at the moment of collision. c. The two stick together and move at the same speed afterward. d. The momentum of the moving object is decreased by the amount of momentum the stationary object picks up at the time of the collision. e. The momentum of the moving object matches the momentum of the stationary object.