What do astronomers consider heavy elements?
A) elements that are heavier than iron
B) elements that are heavier than carbon
C) elements that are heavier than hydrogen
D) elements that are heavier than uranium
E) all elements besides hydrogen and helium
E
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While you are sounding a tone on a toy whistle, you notice a friend running toward you. If you want her to hear the same frequency that you hear even though she is approaching, you must
a. stay put. b. run towards her at the same speed. c. run away from her at the same speed. d. stay put and play a note of higher frequency. e. run towards her and play a note of higher frequency.
The units on the Hubble constant are ____________________
Fill in the blank(s) with correct word
A soccer ball is released from rest at the top of a grassy incline. After 6.4 seconds the ball has rolled 91 m with constant acceleration, and 1.0 s later it reaches the bottom of the incline
(a) What was the ball's acceleration? (b) How long was the incline?
Ice, when it is frozen year-round in the ground, is termed ________.