Galaxy seeds around which galaxies, clusters, and walls grey may have been
a. caused by hot dark matter.
b. caused by baryons.
c. the result of the separation of the electromagnetic and weak forces.
d. the result of freezing water molecules shortly after the universe became transparent to photons.
e. caused by defects in space-time.
E
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Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s and just after is 3.5 m/s. If the ball is in contact with the floor for 0.050 s, what is the magnitude of the average force applied by the floor on the ball?
a. 60 N c. 30 N b. 133 N d. 3.5 N
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