A 4.0 ?F capacitor is connected in series with a 2.0 k? resistor across a 20-V DC source and an open switch. If the switch is closed at t = 0 s, what is the charge on the capacitor at t = 9 ms?
A)
0 C
B)
37% of the minimum charge
C)
68% of the maximum charge
D)
68% of the minimum charge
E)
96% of the maximum charge
C
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Capacitance: What charge accumulates on the plates of a 2.0-?F air-filled capacitor when it is charged until the potential difference across its plates is 100 V?
A. 50 ?C B. 100 ?C C. 150 ?C D. 200 ?C
A spaceship moves at a speed of 0.95c away from the Earth. It shoots a star wars torpedo toward the Earth at a speed of 0.90c relative to the ship. What is the velocity of the torpedo relative to the Earth? (The direction in which the spaceship moves is the positive direction.)
a. ?0.34c b. 0.34c c. 0.060c d. ?0.060c e. 0
In a fusion bomb, what initiates, or triggers, the fusion reaction?
A) a sudden release of neutrons B) a laser beam C) conventional chemical explosive, designed to implode instead of explode D) nuclear magnetic resonance E) a fission explosion
A drive shaft resists torsional shear stress of 45 MPa and axial compressive stress of 100 MPa. The maxi- mum shear stress is approximately:
(A) 42 MPa
(B) 67 MPa
(C) 71 MPa
(D) 93 MPa
