If the sum of both the external torques and the external forces on an object is zero, then the object must be at rest
A) True
B) False
B
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LC Circuits: A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor?
A. 2000 µC B. 2500 µC C. 3000 µC D. 3500 µC E. 4000 µC
Mercury's smooth plains are most similar to the Moon's:
A) maria. B) highlands. C) craters. D) mountain ranges.
The positron was first predicted by
A) Einstein. B) Planck. C) Elvis Presley. D) Dirac. E) Heisenberg.
A distant palm tree on a hot dry day that often appears to be reflected from water is
A) due to light refracted upward as it grazes the hot surface. B) the inverse of a mirage. C) evidence that light travels in straight lines.