A spool of thread has an average radius of 1.00 cm. If the spool contains 47.5 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers
a. 15.1
b. 756
c. 149
d. 7.56
b
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The maximum distance that the particles of a wave's medium vibrate from their rest position:
a) Frequency b) Wavelength c) Wave Speed d) Amplitude
Venus may have started with an ocean's worth of water. Where is its water now?
A) The original water remains vaporized in the atmosphere due to Venus's intense heat. B) Most of the water is frozen beneath the surface. C) Most of the water combined with rocks in chemical reactions. D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space. E) The water changed to carbon dioxide through chemical reactions.
A feature of the nuclear reactor at Chernobyl that contributed to the magnitude of the accident there was that
A. plutonium could build up quickly in the reactor. B. the reactor did not have control rods. C. water was used only as a coolant, not a moderator. D. the uranium fuel was more highly enriched.
A 250-kg crate is placed on an adjustable inclined plane. If the crate slides down the incline with an acceleration of 0.25 m/s2 when the incline angle is 25°, then what should the incline angle be for the crate to slide down the plane at constant speed? Note: g = 9.8 m/s2
a. 12° c. 24° b. 21° d. 29°