A disk is suspended by a nail such that it pivots in a vertical plane about a point on the edge of the disk. If the disk's radius is 25 cm, what is the period of oscillation?
A. 0.71 s
B. Need the mass of the disk to calculate the period.
C. 1.2 s
D. 1.51 s
C. 1.2 s
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Which of these will penetrate into lead?
A) alpha particle B) beta particle C) gamma ray. D) all of the above
The planets all lie in nearly the same plane resulting in a disk-like structure for the solar system. This disk-like structure is believed to exist because
a. the solar nebula from which the planets formed had a disk-like structure. b. the bipolar flow from the young Sun cleared all material out of the nebula except that in the disk. c. Jupiter's gravity was great enough to pull all of the other planets to the plane of its orbit. d. the Milky Way Galaxy from which the planets condensed has a disk-like structure
What do we mean by gravitational time dilation?
A) It is the idea that time runs slower in places where gravity is stronger. B) It is the idea that clocks run slow for people moving at high speed past you. C) It is the idea that everyone measures time differently, depending on his or her reference frame. D) It is the idea that clocks run faster in stronger gravitational fields.
It is expected that only elliptical galaxies have a massive black hole at their center.
Answer the following statement true (T) or false (F)