The isotope most useful for dating rocks from the late Pleistocene is
A) uranium-238.
B) uranium-235.
C) potassium-40.
D) carbon-14.
Answer: D
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A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is then
A) 300 N downward. B) 500 N downward. C) 800 N downward. D) 300 N upward. E) 500 N upward.
The speed of an Earth satellite does NOT depend on its
A) distance from Earth. B) mass. C) but it depends on both D) it depends on neither
A hockey puck traveling at speed v on essentially frictionless ice collides with one end of a straight stick lying flat on the ice and sticks to that end. In this collision
a. momentum is conserved. b. angular momentum is conserved. c. energy is conserved. d. all of the above are conserved. e. only momentum and angular momentum are conserved.
Where did the cosmic microwave background (CMB) come from?
a. photons emitted from the first stars b. photons released from hydrogen in our galaxy c. light scattered by dust in our Solar System d. photons released when electrons and nuclei combined for the first time