What major feature of Saturn's moon Enceladus led scientists to suspect it might have a subsurface ocean?
A) fountains of ice spraying out from the surface into space
B) surface lakes of liquid methane or ethane
C) its large mass and size
D) its many active volcanoes
A) fountains of ice spraying out from the surface into space
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Rotational Kinetic Energy: A string is wrapped tightly around a fixed frictionless pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N, causing the pulley to rotate. What is the speed of the string after it has unwound 1.25 m if the string does not slip on the pulley?
A. 2.09 m/s B. 2.36 m/s C. 1.18 m/s D. 3.18 m/s E. 4.95 m/s
Radiant energy emitted by our planet is
A) terrestrial energy. B) the outcome of radioactivity in Earth's interior. C) electromagnetic. D) all of the above
A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. As the magnet leaves the wire, the induced current (as viewed from above):
a. is clockwise. b. is counterclockwise. c. is zero. d. is along the length of the magnet.
Which of the following processes is approximately reversible?
a) lighting a match b) pushing a block up a frictionless inclined plane c) frying an egg d) swimming across a pool e) stretching a spring by a small amount A. b only B. e only C. b, d and e D. b and e