When a capacitor has a charge of magnitude 80 ?C on each plate the potential difference across the plates is 16 V. How much energy is stored in this capacitor when the potential difference across its plates is 42 V?
a. 1.0 mJ
b. 4.4 mJ
c. 3.2 mJ
d. 1.4 mJ
e. 1.7 mJ
b
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Slanting Surfaces Without Friction: A 150-N crate is being pulled up a perfectly smooth ramp that slopes upward at 15° by a pull that is directed at 30° above the surface of the ramp. What is the magnitude of the pull required to make the crate move up the ramp at a constant velocity of 1.75 m/s?
Fill in the blank(s) with the appropriate word(s).
Energy utilization appears to be
A) a sufficient condition, but not a necessary condition for life B) both a necessary condition and a sufficient condition for life C) neither a necessary condition nor a sufficient condition for life D) a necessary condition, but not a sufficient condition for life
A ly (light year) is the distance that light travels in one year. The speed of light is 3.00 × 108 m/s. How many miles are there in a ly? (1 mi = 1609 m and 1 yr = 365.25 days)
A) 9.46 × 1012 mi B) 9.46 × 1015 mi C) 5.88 × 1012 mi D) 5.88 × 1015 mi E) 2.87 × 1013 mi
As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.