What is the stratosphere?
A) the lowest layer in the atmosphere
B) the part of the atmosphere that absorbs optical light
C) the part of the atmosphere that absorbs ultraviolet
D) the part of the atmosphere that absorbs X-rays
E) the highest layer in the atmosphere
C
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Which of the following statements correctly explains why galaxy collisions should have been more common in the past than they are today?
A) Galaxies were closer together in the past, because the universe was smaller. B) Galaxies were more active in the past and therefore would have collided with each other more frequently. C) Galaxies were much bigger in the past, because they had not contracted completely. D) Galaxies attracted each other more strongly in the past, because they had not yet turned most of their mass into stars.
You throw a ball straight up into the air. In addition to gravity, the ball feels a force due to air resistance. Compared to the time it takes the ball to go up, the time it takes to come back down is:
a) smaller b) the same c) greater
A 188-pound astronaut in a training exercise experiences an acceleration of 7.2 g's. What is the net force (in newtons) acting on the astronaut?
a. 1,353.6 N b. 6,023.5 N c. 59,030.5 N d. 13,536 N
Force on a Moving Charge: If a calculated quantity has units of T ? m/A, that quantity could be
A. an electric field. B. an electric potential. C. ?0. D. a magnetic field. E. a magnetic torque.