The ______________ on the Moon are believed to have been caused by moonquakes
Fill in the blank(s) with correct word
rills
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More than 2000 years ago, Hipparchus compared the positions of some stars with their positions recorded nearly two centuries previously and realized that:
A) the celestial poles and equator remained stationery. B) the celestial poles and equator were slowly moving across the sky. C) the stars were moving closer to each other. D) the stars were moving across the sky randomly.
Life will most likely be able to appear and evolve on a planet around which stage of a star's life?
A) core hydrogen-fusion B) shell helium-fusion C) core helium-fusion D) shell hydrogen-fusion
If F = 40 N and M = 1.5 kg, what is the tension in the string connecting M and 2M? Assume that all surfaces are frictionless.
A. 13 N B. 23 N C. 36 N D. 15 N E. 28 N
A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground. It rebounds with a speed of 1.00 m/s. The ball is in contact with the ground for 0.0140 s
What is the average force exerted by the ground on the ball during that time? A) 2.00 N upwards B) 2.00 N downwards C) 22.0 N upwards D) 22.0 N downwards E) 0 N