The celestial sphere is a scientific model
a. True
b. False
Indicate whether the statement is true or false
True
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The elastic modulus in most materials _________as the temperature increases.
Fill in the blank(s) with the appropriate word(s).
The primary reason for adding fiber reinforcement to a ceramic matrix is to increase the resistance to _________.
Fill in the blank(s) with the appropriate word(s).
If we went back in time 10 billion years, would we expect Hubble's constant to be identical to the present-day Hubble constant?
A) Yes, a constant never changes. B) No, Hubble's constant is roughly equal to 1 divided by the age of the universe, and 10 billion is a substantial enough number to notice a difference. C) If we went back further in time, it would be different, but 10 billion years is not enough. D) It would only change if we went 10 billion years into the future.
A car starting from rest accelerates at a constant 2.0 m/s2 for 10 s. It then travels with constant speed it has achieved for another 10 s. Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s2
How far does it travel after starting? A) 200 m B) 400 m C) 500 m D) 300 m