A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
a. 3.5
b. 49
c. 14
d. 43
e. 4.3
b
Physics & Space Science
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The possible fate of a neutron in ordinary uranium metal is to
A) cause fission of U-235 if present. B) escape the metal. C) be absorbed by U-238 without causing fission. D) all of the above E) none of the above
Physics & Space Science
Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter
a. 5 b. 25 c. 35 d. 45 e. 90
Physics & Space Science
What is the approximate mass-to-light ratio for the inner region of the Milky Way Galaxy, in units of solar masses per solar luminosity?
A) 1000 B) 600 C) 100 D) 6 E) 0.1
Physics & Space Science
A plot of land contains 5.8 acres. How many square meters does it contain? [1 acre = 43,560 ft2]
A) 2.3 × 104 m2 B) 7.1 × 103 m2 C) 7.0 × 104 m2 D) 5.0 × 104 m2
Physics & Space Science