Because of electrostatic polarization, a sufficiently charged rubber balloon will attract a neutral horizontal insulating plate strongly enough so that the balloon sticks firmly to the plate’s bottom. If the horizontal plate is a conductor instead of an insulator, the charged balloon will
A. stick only if the plate is connected to the earth.
B. stick only if the plate is insulated from the earth.
C. stick in either case.
D. not stick at all.
E. repel the plate.
C. stick in either case.
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When a switch is closed to complete a DC series RL circuit,
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a. mercury b. water c. none of these
A Ferris wheel starts at rest and builds up to a final angular speed of 0.70 rad/s while rotating through an angular displacement of 2.5 rad. What is its average angular acceleration?
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