Suppose Spider-Man throws a web that is 1.00 m long with a velocity of 0.8c (? = 5/3) with respect to the Earth. What will be the length of web as observed by J. Jonah Jameson standing on the Earth?
A. 0.80 m
B. 1.67 m
C. 1.33 m
D. 0.60 m
E. 1.00 m
Answer: D
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An LR circuit contains an ideal 60-V battery, a 51-H inductor having no resistance, a 21-? resistor, and a switch S, all in series
Initially, the switch is open and has been open for a very long time. At time t = 0 s, the switch is suddenly closed. When the voltage across the resistor is equal to the voltage across the inductor, what is the current in the circuit? A) 1.4 A B) 0.57 A C) 1.1 A D) 0.86 A E) 1.7 A
If you were standing on a cart that was at rest and free to roll (ignore friction) and someone threw a 10 kg ball at you, you would
A. roll backward faster if you caught the ball higher above the ground. B. roll backward faster if the ball bounced off of you elastically. C. not move if you caught the ball because you are more massive than the ball. D. roll backward faster if you caught the ball.
Electrons
a)have a positive charge. b)have a mass greater than a proton. c)possess a negative electric charge. d)have the same mass as a proton.
A crate is given an initial speed of 3.0 m/s up the 25.0° plane shown in Fig. 5–33.
(a) How far up the plane will it go?
(b) How much time elapses before it returns to its starting point?
