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
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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
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
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
An atom with fewer electrons than protons is a __________
Fill in the blank(s) with correct word