Just as a low-mass main sequence star runs out of fuel in its core, it actually becomes brighter. How is this possible?
A) Helium fusion gives more energy than hydrogen fusion does, based on masses.
B) Its outer envelope is stripped away and we see the brilliant core.
C) The core contracts, raising the temperature and increasing the size of the region of hydrogen shell-burning.
D) It explodes.
E) It immediately starts to fuse helium.
C
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As one approaches the bottom of a body of water, the circles shown in figure Q1.3 for water waves moving along the water’s surface become increasingly vertically flattened ellipses. This means that the waves near the body’s bottom are more (A) transverse or (B) longitudinal than those near the surface? 
A. Transverse B. Longitudinal
A cyclist does work at the rate of 500. W while riding. With how much average horizontal force does the wheel push when she is traveling at 10. m/s?
What will be an ideal response?
A 0.17-kg baseball is thrown with a speed of 38 m/s and it is hit straight back toward the pitcher with a speed of 62 m/s. What is the magnitude of the impulse exerted by the bat on the ball?
What will be an ideal response?
An anti-proton would have
A) negative charge and positive mass. B) no charge and positive mass. C) negative charge and negative mass. D) positive charge and negative mass. E) positive charge and positive mass.