To say you can never change only one thing means that when you change something,
A) some other thing or things change.
B) only one other thing will change.
C) you can't reverse it.
Answer: A
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It would be easier to pull the evacuated Magdeburg hemispheres apart if they were
A) held upside down. B) at sea level. C) 20 km beneath the ocean surface. D) 20 km above the ocean surface. E) none of the above
When starting from rest at the bottom of a straight road with constant upward slope, Joan bicycles to the top 50.0 s ahead of Sally, whose travel time is 5.00 minutes. What is the ratio of Joan's acceleration to Sally's acceleration?
a. 0.694 b. 0.833 c. 1.20 d. 1.44 e. 6.00
Mercury's magnetic field is thought to be due to:
A) dynamo action, like the Earth's magnetic field. B) a mechanism entirely unique to Mercury. C) being close to the Sun. D) being a fossil remnant dating back to the distant past when the core was more liquid.
Two parallel wires carry the a current I in the same direction. Midway between these wires is a third wire, also parallel to the other two, which carries a current 0.5 I, but in the direction opposite from the first two wires. In which direction are the net forces on the outer wires?
a. Both forces are toward the center wire. b. Since the net forces are zero, there is no direction. c. Both forces are away from the center wire. d. Both forces on the two wires are in the same direction in space.