The absolute magnitude of a star is its brightness as seen from a distance of:
A) one million kilometers.
B) one astronomical unit.
C) one light year.
D) ten parsecs.
E) 10 light years.
D
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A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. After the thruster is turned off, which trajectory best describes the probe’s subsequent motion?
A. A
B. B
C. C
D. D
E. E
As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in
A) volume. B) density. C) weight. D) mass. E) none of the above
You are walking holding on to the axle of a spinning bicycle wheel with one hand on either side of the wheel. The top part of the wheel is moving away from you and the bottom is moving toward you and the axle is horizontal. As you start to turn left, you feel the right side of the axle
A) push on your right hand toward the left. B) push on your right hand toward you. C) pull on your right hand away from you. D) push on your right hand vertically up. E) push on your right hand vertically down.
A bar magnet is held near a single closed loop of wire. The magnet is aligned with the loop axis, and the north pole is facing the loop. If the magnet is moved away, the current induced in the loop will be in a ________ direction as viewed from the side the magnet is on.
Fill in the blank(s) with the appropriate word(s).