Astronauts approaching a black hole would observe that _____
a. time appears to slows down for them
b. time appears to speed up for external observers
c. they become squashed flat - their heads and feet are pushed together by gravitational tides
d. they become stretched thin - their heads and feet are pulled apart by gravitational tides
e. nothing appears to change
d
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Fig. 10-3 illustrates a simplified roller bearing. The outer hollow cylinder has a radius of 1.2 cm and is stationary. The inner cylinder has a radius of 1.0 cm and is rotating at 11 rpm
Between the two cylinders are several small cylinders with a radius of 0.10 cm, which roll without slipping on both the inner and outer cylinders. Only one of these cylinders is shown in the figure. What is the angular speed of the small cylinders? A) 12 rpm B) 10 rpm C) 20 rpm D) 62 rpm E) 55 rpm
An organ pipe closed at one end has a length of 60 centimeters. What is the wavelength of the second harmonic?
A. 20 cm B. 60 cm C. 80 cm D. 100 cm
A man weighs 650 N while on the surface of Earth. If he is transported to the planet Mythos, which has the same mass as Earth but a radius that is five times larger than Earth's, his weight would be
A. 16,250 N. B. 26 N. C. 3,250 N. D. 130 N. E. 650 N.
What is one of the differences between Cepheids and RR Lyrae variables?
A) The period-luminosity relation holds only for RR Lyrae stars. B) The pulsations of RR Lyrae stars are much less regular than those of Cepheids. C) Cepheids are giants, but RR Lyrae stars are still on the main sequence. D) All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. E) The RR Lyrae stars have much shorter periods than Cepheids.