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A 2.74-nF parallel-plate capacitor is charged to an initial potential difference ?Vi = 100 V and is then isolated. The dielectric material between the plates is porcelain, with a dielectric constant of 6. (a) How much work is required to withdraw the porcelain sheet? (b) What is the potential difference of the capacitor after the porcelain is withdrawn?
An astronomer on earth observes two galaxies moving away from each other along a line that passes through the earth. At what speed are the galaxies moving apart relative to each other?
An athlete at the gym holds a 3kg steel ball in his hand. His arm is 70 cm long and has a mass of 4kg. What is the magnitude of the torque about his shoulder
q1. a ferris wheel is a vertical circular amusement ride with radius 6 m. riders sit on seats that swivel to remain
A mass m is attached to an ideal cord of length L (figure at left). What is the tension in the cord at that moment
q1. a rubber ball of mass m 0.739 kg is dropped from a height ho 4.73 m and it rebounds to a height hf 3.66 m.
Two positive point charges q1 = 12C and q2 = 48C are a distance 0.25 m apart. Find all the points where the total electric field is zero
An astronomical telescope has an angular magnification of -144, What is the focal length of the eyepiece
A 24V battery is connected in series with a resistor, R=4 ohms and an inductor L=2H. What is the energy stored in the inductor
A neon sign at the Catskellar requires 12,000 V to operate which is supplied by a transformer. If the primary draws 0.5 A, how much current is suppplied to the neon sign
One gallon of gasoline contains 3.1 multiply.gif 107 calories of potential energy that are released during combustion. what is the average force produced by the gasoline
At 14.7 g mass is attached to a frictionless, horizontal spring. After the spring was stretched a certain distance and released, what is the oscillation frequency of the spring
An earth satellite moves in a circular orbit with an orbital speed of 6200 m/s. Find the time of one revolution of the satellite
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