How long ago did the Big Bang occur?
a. About 6,000 years ago.
b. 15 thousand years ago.
c. 15 million years ago.
d. 15 billion years ago.
e. 15 trillion years ago.
d
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Significant Figures: What is the sum of 1.53 + 2.786 + 3.3 expressed to the correct number of significant figures?
A. 7 B. 7.6 C. 7.62 D. 7.616 E. 7.6160
The device that spreads light into its component colors in a spectroscope is a
A) prism. B) diffraction grating. C) either of these D) neither of these
A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her moment of inertia decreases by 1/2. By what factor does her rotational kinetic energy change?
A) 2 B) 4 C) D) 1/2 E) It doesn't change.
Two nonzero vectors have unequal magnitudes of X and Y. Which of the following could be the length of their sum?
(i) 0 (ii) X+Y (iii) X (iv) Y
1.(ii) only 2.Any of them could be the length of the sum. 3.(i), (iii), and (iv) 4.(ii), (iii), and (iv)