Power: For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?
A. resistivity
B. resistance
C. energy
D. current
E. capacitance
Answer: D
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A test charge of +3 ?C is at a point P where the electric field due to other charges is directed to the right and has a magnitude of 4 x 106 N/C. If the test charge is replaced with a –3 ?C charge, the electric field at P
1.has the same magnitude as before, but changes direction. 2.increases in magnitude and changes direction. 3.remains the same. 4.decreases in magnitude and changes direction.
Which of the following is the rate at which energy is transferred?
a. potential energy b. kinetic energy c. mechanical energy d. power
If the redshift of a quasar were 3, at what wavelength would the 486.1-nm line of hydrogen appear in the quasar's spectrum?
What will be an ideal response?
The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible mass
(a) Determine the force that must be exerted by the fluid in the lift on the small piston. (b) Determine the pressure applied to the fluid in the lift.