Which has the greater density, a lake full of water or a cupful of lake water?
A) the cupful of lake water
B) the lake
C) both have the same density
Answer: C
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Why is the moon Io volcanically active with a hot interior?
A. Io was formed later than the other Galilean satellites, so it hasn't finished cooling yet. B. Io is very close to the Sun. C. Io gets flexed between the changing gravitational pulls of Jupiter and Europa, heating it by friction. D. Radioactive decay of elements in Io's core heat up the rock to molten temperatures.
When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
a. 0.25 b. 0.50 c. 1 d. 2 e. 4
A 0.588-m string is tightly clamped at both ends. If the lowest standing wave frequency of the string is how fast do waves travel on this string?
A) 475 m/s B) 582 m/s C) 383 m/s D) 724 m/s
When a drag strip vehicle reaches a velocity of 60 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight line path is a constant -6.0 m/s2 . What displacement does it undergo during this deceleration period?
a. 120 m c. 320 m b. 300 m d. 240 m