The main source of energy in main sequence stars is ________.

A. fusion of hydrogen to helium
B. the triple alpha process
C. gravity
D. the chemical reaction between hydrogen and helium


Answer: A

Physics & Space Science

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To totally convert a given amount of mechanical energy into heat is

A) possible. B) impossible. C) need more information D) none of the above

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A solid object floats in water with three-fourths of its volume beneath the surface. What is the object's density? The density of water is 1000 kg/m3

A) 1333 kg/m3 B) 1000 kg/m3 C) 750 kg/m3 D) 250 kg/m3

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A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?

a. 9.9 s b. 7.8 s c. 8.5 s d. 9.2 s e. 6.4 s

Physics & Space Science

An atom with fewer electrons than protons is a __________

Fill in the blank(s) with correct word

Physics & Space Science