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A parallel-plate capacitor is made from two plates 12.5 cm on each side and 4.20 mm apart. Half of the space between these plates contains only air, but the other half is filled with Plexiglas of dielectric constant 3.40. An 19.5 V battery is connected across the plates. If we remove the Plexiglas, but change nothing else, how much energy will be stored in the capacitor?
A nearsighted person wears glasses to correct the problem. How far in cm from the eyes is the person's far point located
Clarify how Einstein's contribution to understanding the force between the earth and the moon differed from Newton's. Include a short statement of Einstein's explanation in the answer.
A 1.30-kg ball, moving to the right at a velocity of +4.52 m/s on a frictionless table, collides head-on with a stationary 8.40-kg ball. Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic
An electric field of 9.45 105 V/m is desired between two parallel plates, each of area 37.0 cm2 and divided by 2.45 mm of air. What charge must be on each plate.
A copper kettle contains water at 24.0 °C. When the water is heated to 99.0 °C, Determine the volume of the kettle
As a projectile moves in its path, is there any point along the path where the velocity and acceleration vectors are (a) perpendicular to each other? (b) Parallel to each other?
Two cars travel in the same direction along a straight highway, How far must the faster car travel before it has a 15-min lead on the slower car
ocean waves with wavelength 1.2 m and period 1.5s are moving past a pier. a boy runs along the pier, how many wave crests pass the boy each second
Starting from rest, two skaters "push off" against each other on smooth level ice, where friction is negligible. find the recoil velocity of the man relative to the ice
A solid sphere of radius R carries a volume charge density ?=?0e^r/R, Find an expression for the electric field strength at the sphere's surface
Two cars cover the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest and maintains a constant acceleration. Both cars cover a distance of 547m in 221s.
A 40.0g ball of clay traveling east at 3.00m/s collides, What is the speed of the resulting ball of clay
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