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Suppose you bring a slab of dielectric close to the gap among the plates of a charged capacitor, preparing to slide it among the plates. What force will you feel? What does this force tell you about the energy stored among the plates once the dielectric is in the place; compared to before the dielectric is in place?
During a physics experiment, helium gas is cooled to a temperature of 19.0K at a pressure of 0.140 atm. What are the average energy per atom
A physics professor demonstrates the Doppler effect by tying a 650 Hz sound generator to a 1.1 m long rope and whirling it around her head in a horizontal circle at 100 rpm.
A 1.7m -long barbell has a 21kg weight on its left end and a 32kg weight on its right end. What is the torque due to gravity about the left end of the bar
A 1100 kg car is moving at a speed of 40.0 m/s. How much work is required to bring the car to rest
gravity affects any object that has mass. does gravity affect light rays? a beam of light emitted from a distant star
A camper is trying to start a fire by focusing sunlight onto apiece of paper. The diameter of the sun is 1.39 x109 m, and its mean distance from the earth is 1.50x 1011 m. The camper is using a converging lenswhose focal length is 10.3 cm.
A trap door, of length and width 2.90 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
The "reaction time" of the average automobile driver is about 0.7. Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 14.6
A system consisting of two positive particles is altered by an outside force so that its potential energy increases by 5.4 ?J. What is the work done by the outside force
A copper wire wrapped into a coil is hooked to a 3.00V battery and a switch. At t=0 the switch S is closed. At t=20 seconds the current in the circuit is 24mA. After a long time the current in the circuit is 50mA.
a 4 cm diameter vertical cylinder is sealed at the top by a frictionless piston. the piston is 23 cm above the bottom
A superwoman is travelling in a rocketcroft at a speed of 1.5 x10^ 8 m/s is holding a coffee cup that is 20 cm tall and 8 cm in diameter, What is the width of the cup in the direction of the travel
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