The critical evidence for cosmic acceleration in 1998 came from two teams of astronomers, both observing
A) hypernovae.
B) gamma ray bursts.
C) type I supernovae.
D) type II supernovae.
E) ages of globular clusters.
C
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Slanting Surfaces Without Friction: A 2.8-kg tool can move on a perfectly smooth ramp that slants at 42° above the horizontal. What are the magnitude and direction of the acceleration of this tool if it is sliding (a) up the ram, (b) down the ramp?
What will be an ideal response?
An M type star 1,000 times more luminous than the Sun will be located near the ________ part of the H-R diagram.
A. bottom right B. center C. top left D. top right E. bottom left
A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
A) 75 N. B) 7.5 N. C) 750 N. D) any horizontal force greater than zero.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is decreased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.