According to general relativity, how is time affected by gravity?
A) Time is not affected by gravity.
B) Time is affected by gravity, but not in a predictable way.
C) Time is stopped by any gravitational field.
D) Time runs faster in stronger gravitational fields.
E) Time runs slower in stronger gravitational fields.
E
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The theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula. b. laboratory measurements of the mass of the neutrino. c. the brightening of supernovae a few days after they are first visible d. underground counts from solar neutrinos. e. the detection of neutrinos from the supernova of 1987.
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
a. 3.8 N/C b. 4.1 N/C c. 3.5 N/C d. 3.2 N/C e. 0.28 N/C
The region on the H-R diagram where pulsating variables occur is called the:
A) period-luminosity relation. B) mass-luminosity relation. C) instability strip. D) horizontal branch. E) main sequence appendix.
A thin infinitely large current sheet lies in the y-z plane. Current of magnitude Js per unit length along the z axis travels in the y-axis direction, which is up out of the page. Which diagram below correctly represents the direction of the magnetic field on either side of the sheet?
a.
b.
c.
