If the ac peak voltage across a 100-ohm resistor is 120 V, then the average power dissipated by the resistor is
A) 102 W.
B) 288 W.
C) 72 W.
D) 144 W.
E) 220 W.
C
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A 1520-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal (see figure)
The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp. The coefficients of friction between the crate and the surface of the ramp are µk = 0.450 and µs = 0.650. The pulley has no appreciable mass or friction. What is the MAXIMUM weight w that can be used to hold this crate stationary on the ramp? What will be an ideal response?
Consider two transformers. Transformer A has 300 turns on its primary and 500 turns on its secondary. Transformer B has 250 turns on its primary and 1000 turns on its secondary
The same voltage is supplied at the primary of both transformers. The secondary voltage in transformer A has an amplitude V = 50 V. What is the amplitude of the secondary voltage on transformer B? A) 120 V B) 2400 V C) 1200 V D) 60 V E) 240 V
When you do somersaults, you'll more easily rotate when your body is
A) straight with both arms above your head. B) straight with both arms at your sides. C) curled into a ball shape. D) no difference
Impulse: Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
A. smaller than the magnitude of the change in momentum of the larger mass, but not zero. B. larger than the magnitude of the change in momentum of the larger mass. C. exactly equal to the magnitude of the change in momentum of the larger mass. D. zero. E. There is not enough information to answer the question.