When a metamorphic rock is melted and then re-solidifies it turns into
A) an igneous rock
B) a sedimentary rock
C) a meteorite
D) another metamorphic rock
Question 2A car starting from rest moves with constant acceleration of 2 m/s2 for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of -2 m/s2. How far does it travel?
A) 400 m
B) 100 m
C) 500 m
D) 300 m
E) 200 m
Question 3The most severe mass extinction during the past 500 million years occurred at the end of which geological period?
A) Devonian
B) Triassic
C) Permian
D) Cretaceous
Question 4A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. The acceleration of gravity at the satellite, as compared to the acceleration of gravity on the surface of Mars, is
A) one-ninth as much.
B) zero.
C) the same.
D) one-third as much.
E) one-sixteenth as much.
Question 5Doubling only the amplitude of a vibrating mass-and-spring system produces what effect on the system's mechanical energy?
A) produces no change
B) increases the energy by a factor of three
C) increases the energy by a factor of four
D) increases the energy by a factor of two
E) increases the energy by a factor of
Question 6A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is
A) 5.0 N/cm
B) 49 N/cm
C) 0.20 N/cm
D) 20. N/m
E) 0.0020 N/cm
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