Before about 50,000 years after the Big Bang, the universe was:
A) radiation dominated.
B) quark dominated.
C) lepton dominated.
D) matter dominated.
E) dark energy dominated.
A
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a. True b. False Indicate whether the statement is true or false
How does distance between particles and particle motion change as a solid substance becomes a gas?
What will be an ideal response?
Equilibrium: A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A. 231 N B. 400 N C. 800 N D. 2560 N E. 3920 N
How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g?°C.)
A. 190 B. 200 C. 240 D. 210 E. 50