A 70-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 6.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.25 s, what is the magnitude of the average horizontal force by diver
on the raft?
a. 110 N
b. 420 N
c. 2 000 N
d. 1 700 N
e. 24 N
d
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A block of wood has density 0.50 g/cm3 and mass 2250 g. It floats in a container of oil (the oil's density is 0.75 g/cm3). What volume of oil does the wood displace?
a. 3000 cm3 c. 1500 cm3 b. 2250 cm3 d. 1000 cm3
Charge of uniform density 50 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 5.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 2.7 V b. 2.0 V c. 2.4 V d. 1.7 V e. 3.4 V
Why do we conclude that a starburst must represent only a temporary stage in galaxy evolution?
A) We observe starbursts to last only a few years in any individual galaxy before the starburst ends. B) The star formation rate of a starburst would consume all available gas for star formation in a time much shorter than the age of the universe. C) We don't see any starbursts occurring in nearby galaxies. D) Galaxies with starbursts are all very far away, indicating that these starbursts occurred only very long ago.
Which of the following best describes the primary difference between asteroids and comets?
A) Asteroids are rocky and comets are ice-rich. B) Comets are much larger than asteroids. C) Comets always have tails and asteroids never have them. D) Comets tend to orbit the Sun in the inner solar system, while asteroids tend to orbit much farther away.