A wheel accelerates with a constant angular acceleration of 4.5 rad/s2 from an initial angular speed of 1.0 rad/s. (a) Through what angle does the wheel turn in the first 2.0 s, and (b) what is its angular speed at that time?
What will be an ideal response?
(a) 11 rad (b) 10 rad/s
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Ancient astronomers thought the heavens were perfect circles, spheres, and unblemished
a. True b. False Indicate whether the statement is true or false
A(n) ____________________ is used to measure the brightness and color of stars
Fill in the blank(s) with correct word
An astronaut traveling with a speed v = 0.90 c holds a meterstick in his hand. If he measures its length, he will obtain a value of
a. 1.0 m b. 2.3 m c. 0.19 m d. 0.43 m e. 0.81 m
Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter and that all of it suddenly decays tomorrow into photons or other forms of energy. Based on current understanding, which of the following would begin to occur?
A) Stars would begin to stop having nuclear fusion in their cores. B) Planetary systems would begin to expand and disperse. C) The galaxies in clusters would begin to fly apart. D) The expansion of the universe would begin coming to a halt.