The allowed shapes for orbits under the force of gravity are ___________________________.
What will be an ideal response?
ellipses, parabolas, and hyperbolas
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Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
a. A comparison is impossible unless they are both floating at the same level. b. Fish A displaces a greater quantity of water than fish B. c. Fish B displaces a greater quantity of water than fish A. d. They both displace the same quantity of water. e. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
A. is independent of velocity or acceleration. B. increases when the velocity increases. C. is proportional to the acceleration. D. decreases when the force parallel to the floor increases. E. increases when the force parallel to the floor increases.
About how hot was the Big Bang when matter and energy "decoupled"?
A) 900 million K B) 15 million K C) 3,000 K D) 300 K E) 2.73 K
Two identical sound producers will sound twice as loud as just one
a. True b. False Indicate whether the statement is true or false