Diamonds are so sparkly and beautiful primarily because they
Answer: Light slows down when it enters denser materials.
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There is no obvious evidence for large-scale structure greater than about
A) 200 kpc. B) 600 kpc. C) 200 Mpc. D) 600 Mpc. E) 2000 Mpc.
Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years
Indicate whether the statement is true or false
An electric current can consist of
a. positive ions flowing in a liquid. b. negative ions flowing in a liquid. c. electrons flowing in a wire. d. all of the above.
If the pole-vaulter were to land on concrete rather than on a cushion, the impulse that stops the fall would be:
a. greater because of the rigidity of the concrete. b. greater because the force of impact is greater. c. less, because there is less change in momentum during the stop. d. less, because he would come to a stop over a shorter period of time. e. the same because impulse is the change in momentum of the object.