Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero.
B) the same as before.
C) small, but noticeable.
Answer: A
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Low air pressure is associated with warm air temperatures.
Indicate whether the statement is true or false.
What are the only four forces that can affect matter?
What will be an ideal response?
The Virgo cluster
a. is the galactic cluster that contains the Milky Way. b. is the oldest known cluster of galaxies. c. is located at the center of the universe. d. contains mostly spiral galaxies and very few elliptical galaxies. e. is a rich cluster and the closest cluster of galaxies outside of the Local Group.
Projectile Motion: A boy throws a rock with an initial velocity of 3.13 m/s at 30.0° above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?
A. 0.160 s B. 0.282 s C. 0.313 s D. 0.441 s