Earth pulls on the Moon, and the Moon pulls on Earth, which tells us that
A) these two pulls comprise an action-reaction pair.
B) both Earth and Moon circle a common point.
C) more massive objects pull harder.
D) all of the above
Answer: A
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A car was moving 110. km/hour
(a) How long did it take to go 25.5 miles? (b) If it stopped in 35. s, what was its average acceleration (m/s2 ) as it slowed down?
You hold a tennis racket in your hand. On top of the racket you have balanced a ball. Which statement is true?
a. The force of your hand on the racket and the force of the ball on the racket are equal and opposite. b. The force of the racket on your hand and the force of the ball on the racket are equal and opposite. c. The force of your hand on the racket and the force of the racket on the ball are equal and opposite. d. The force of the racket on your hand and the force of the racket on the ball are equal and opposite. e. The force of your hand on the racket and the force of the racket on your hand are equal and opposite.
The heliocentric model of the solar system was developed by
a. Brahe. b. Kepler. c. Copernicus. d. Newton.
Identify the correct sequence of life events for a high mass star
A) red supergiant, main sequence, neutron star, supernova B) red supergiant, main sequence, supernova, neutron star C) main sequence, red supergiant, supernova, neutron star D) main sequence, red supergiant, neutron star, supernova