In the figure, a 4.0-kg ball is on the end of a 1.6-m rope that is fixed at 0. The ball is held at point A, with the rope horizontal, and is given an initial downward velocity
The ball moves through three quarters of a circle with no friction and arrives at B, with the rope barely under tension. The initial velocity of the ball, at point A, is closest to
A) 4.0 m/s
B) 5.6 m/s
C) 6.3 m/s
D) 6.9 m/s
E) 7.9 m/s
Answer: D
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a. A daily b. A lunar c. An epicycle d. A geosynchronous e. An open
Suppose we observe a source of X-rays that varies substantially in brightness over a period of a few days. What can we conclude?
A) The X-ray source is a quasar. B) The X-ray source contains a black hole with an accretion disk. C) The X-ray source is no more than a few light-days in diameter. D) The X-ray source must have a strong, rapidly varying magnetic field. E) We are seeing the rapid orbit of two stars in a binary system.
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A) mass. B) weight. C) both the same. D) none of the above
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Indicate whether the statement is true or false