If grand unified theories are correct, what caused inflation at the end of the GUT era?
A) Gravity was an extremely weak force at this period in time.
B) Large amounts of matter and antimatter annihilated at this time.
C) There wasn't enough matter present to slow down the expansion at that time.
D) The universe was too small and needed to grow quickly.
E) An enormous amount of energy was released when the strong force froze out (became distinct) from the GUT force.
E) An enormous amount of energy was released when the strong force froze out (became distinct) from the GUT force.
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Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the magnitude of the minimum force, applied 0.30 m on the other side of the pivot, that is needed to make the child lift off the ground?
A. 75 N B. 740 N C. 23 N D. 44 N E. 66 N
As Earth _______________ on its axis, it produces the cycle of day and night
Fill in the blank(s) with correct word
Which of the following is an example of a true "wave", as that word is used in physics?
A) A water wave that is coming into the beach, like the waves that surfers use to surfboard on B) A stream flowing downhill over rocks C) Both of the above. D) None of the above.
Antiquity's greatest observer of stars was named
a. Hipparchus. b. Eratosthenes. c. Aristotle. d. Imhotep.