You carry a 20-N box 5 m horizontally across a room. The work you do is
a. 0 b. 4 J.
c. 100 J. d. none of the above.
a
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In the critical density universe now proposed, the ratio of dark energy to matter is about:
A) 1 to 100. B) 1 to 1. C) 3 to 1. D) 10 to 1. E) 1 to 5.
The current supplied by a battery as a function of time is I(t) = (0.88
A)e-t/(6.0 hr). What is the total number of electrons transported from the positive electrode to the negative electrode from the time the battery is first used until it is essentially dead? (e = 1.60 × 10-19 C) A) 1.2 × 1023 B) 4.4 × 1022 C) 5.3 × 1023 D) 3.3 × 1019
For any object orbiting the Sun, Kepler's Law may be written T2 = kr3 . If T is measured in years and r in units of the Earth's distance from the Sun, then k = 1 . What, therefore, is the time (in years) for Jupiter to orbit the Sun if its mean radius from the Sun is 5.2 times the Earth's distance from the Sun?
a. 5.2 years c. 12 years b. 6.0 years d. 16 years
The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a distance of 12.0 cm, what is its maximum speed when the engine is running at 3000 rpm?
a. 4.71 m/s c. 44.0m/s b. 9.42 m/s d. 22.0 m/s