If Earth's axis were tilted at 40°, the seasons of the year would
a. be shorter.
b. be harsher.
c. be longer.
d. not change.
e. be milder.
b
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How did conditions differ from the present era when the universe was young?
A.) The young Universe was colder, less dense, and smoother. B.) The young Universe was hotter, less dense, and smoother. C.) The young Universe was colder, less dense, and bumpier. D.) The young Universe was hotter, more dense, and smoother. E.) The young Universe was colder, more dense, and bumpier.
The total mass of a binary system can be calculated from
a. the ratio of the angular separation from the center of mass of each of the stars. b. the distance to the binary and its radial velocity. c. the semi major axis and period of the orbit. d. the radial velocities of the two stars. e. the time required for the small star to eclipse the larger star.
Mass on a Spring: An object that hangs from the ceiling of a stationary elevator by an ideal spring oscillates with a period T. If the elevator accelerates upward with acceleration 2g, what will be the period of oscillation of the object?
A. 4T B. 2T C. T D. T/2 E. T/4
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number A of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.