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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As a wave-generating object moves through a medium, the waves ahead
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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
In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy:
a. is half the kinetic energy of the electron. b. is equal to n2 times the kinetic energy of the electron. c. is equal to the kinetic energy of the electron. d. is twice the kinetic energy of the electron.