The evidence that the universe is expanding at an accelerating rate comes from observations of
A) the redshifts in the light of from supernovas in other galaxies far away.
B) the rate of rotation of distant galaxies.
C) the center of our own galaxy, which is accelerating as it expands.
D) the redshifts of the stars in our own galaxy.
E) the redshift in the light from the cosmic background radiation.
A
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Significant Figures: Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures.
Fill in the blank(s) with the appropriate word(s).
We can describe the location of a point on Earth's surface by stating its
A) altitude and meridian. B) altitude and direction. C) latitude and direction. D) latitude and longitude. E) meridian and longitude.
Which of the following could be associated with a temperature increase for a fixed amount of gas?
1.a decrease in the volume at constant pressure 2.a decrease in the pressure at constant volume 3.a decrease in both the pressure and the volume 4.an increase in the pressure at constant volume
A small bead slides without friction along the wire shown. It begins at A and slides by gravity past B, which doesn't touch the rest of the wire. The potential energy of the bead is greatest at point
1) A, 2) B, 3) C, 4) D, 5) E, and the bead has its maximum momentum at point 6) A. 7) B. 8) C. 9) D. 10) E.