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 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).
The elastic modulus in most materials _________as the temperature increases.
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