As shown in the above image, rising material is flowing from the penumbra and into the umbra where it sinks
a. True
b. False
B
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If a piece of wood is suspected to be several thousand years old, its true age can likely be determined through use of the isotope _________
Fill in the blank(s) with correct word
In order to predict whether a star will eventually fuse oxygen into a heavier element, you mainly want to know what fact about the star?
A) how much oxygen it now has in its core B) its mass C) its luminosity D) its overall abundance of elements heavier than helium
A runner circles a track of radius 100 m in 100 s moving at a constant rate. If the runner was initially moving east, what has been the runner's average acceleration when halfway around the track?
a. At a constant rate, the average acceleration would be zero. b. 0.13 m/s2, south c. 0.25 m/s2, west d. No answer is correct.
A knight on horseback holds a 9.0-m lance. The horse can run at 0.75c. (It wins most of its races!) How long will the lance appear to a person that is standing still on the ground as the horse runs past?
a. 6.0 m b. 14 m c. 9 m d. 6.8 m e. 4.5 m