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A charge q is distributed uniformly around a thin ring of radius r. The ring is rotating about an axis through its center and perpendicular to its plane, at an angular speed w.
1. What is the direction of this magnetic moment if the charge is positive?
2. Show that the magnetic moment due to the rotating charge has magnitude u=(.5)qwr^2.
A capacitor with air between its plates is charged to 70 V and then disconnected from the battery. When a piece of glass is placed between the plates, the voltage across the capacitor drops to 50 V. What is the dielectric constant of this glass?
Suppose your waffle iron is rated at 0.85 kW when connected to a 2.10 102 V source. What current does the waffle iron carry
Humans cool off by perspiring; the evaporating sweat removes heat from the body. what is the entropy change of the universe due to the evaporation of 215 mL of sweat
a 9 volt battery contains a total of 1.78 coulombs. when thebattery is connected in a circuit, the positive and negativechanges are split apart. Find the increase in potential energy
At the microscopic and macroscopic levels, what is the physical significance of entropy? Why do professionals bother with calculating it?
a 66.0-kg woman in an elevator is accelerating upward at a rate of 2.8m/s^2. What is the net force acting on the woman
Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 3.50 m below the edge. Explain how fast is she going just before she lands?
A small metal bead, labeled A, has a charge of 29 . It is touched to metal bead B, initially neutral, so that the two beads share the 29 charge, but not necessarily equally. When the two beads are after that placed 5.0 apart, the force between the..
A double slit with d= 0.02 mm is illuminated by a blue laser at 450 nm and a red laser at 650 nm, what is the distance separating the blue and red fringe
Two mirrors meet at a 127° angle. If light rays strike one mirror at 40° as shown, at what angle ? do they leave the second mirror.
In one day, a 81-kg mountain climber ascends from the 1410-m level on a vertical cliff to the top at 2208 m. The next day, she descends from the top to the base of the cliff, which is at an elevation of 1215 m.
The hydrogen bomb detonated in 1954 had an explosive power equal to about 15 megatons of TNT, How many times more explosive was the hydrogen bomb
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