Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ
b
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The centroid of the L-shaped segment shown in the figure below is at coordinates (x, y) (in.):
(A) 2.0, 1.75
(B) 3.0, 1.50
(C) 2.0, 1.50
(D) 2.5, 1.25
When an object is partly or wholly immersed in a liquid, it is buoyed up
A) by a force equal to its own weight. B) by a force equal to the weight of liquid displaced. C) and floats because of Archimedes' principle. D) but sinks. E) none of the above
A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 cm downward
The wood is then pulled an additional distance of 1.0 cm down and released from rest. (a) How long does it take the wood to make 3 complete cycles of vibration? (b) How much total mechanical energy does this system contain if we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging block?
What is the saros cycle?
A) the 26,000-year cycle of the Earth's precession B) the roughly 18-year cycle over which the pattern of eclipses repeats C) the roughly one-month cycle of lunar phases in the sky D) the annual cycle of the seasons