A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg ? m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each of mass 60 kg, are standing right outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed relative to the ground. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s
B) 0.40 rad/s
C) 0.60 rad/s
D) 0.80 rad/s
E) 0.67 rad/s
B
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What is the ratio of the escape speed of a rocket launched from sea level to the escape speed of one launched from Mt. Everest (an altitude of 8.85 km)? The radius of the earth is 6.38 × 106 m
A) 1.0007 B) 1.0014 C) 1.0001 D) 0.9986 E) 0.9993
Scientists have detected thousands of gamma ray bursts. The evidence suggests that most or all of these bursts
A) have occurred in the central regions of the Milky Way. B) have occurred in distant galaxies. C) come from the same types of close binary systems that produce X-ray bursts. D) come from the Oort cloud surrounding the Sun.
If you launch two probes in opposite directions from the Space Station, they will meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through space time, but those paths happen to meet. B) They are following the allowed orbits according to Newton's universal law of gravitation. C) The force of gravity tugs on the probes and forces them to orbit Earth. D) Objects launched in space always follow circular paths, no matter where they are.
The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m b. 0.0000034 m c. 0.00034 m d. 0.34 m e. 340,000,000 m