What is the upper limit of stars the unaided eye can discern on a moonless night in a rural area?
A) about 3000
B) about 30,000
C) about 300,000
D) about 3,000,000
Answer: A
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The photosphere is about 100 times the diameter of the Earth
Indicate whether the statement is true or false
According to Newton, the closer gravitationally interacting objects are to each other, theA) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.
You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile b. half a mile c. a tenth of a mile d. none of the above
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide and 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.