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The voltage across an air-filled parallel-plate capacitor is mesured to be 200 v. When a dielect is inserted and completely fills the space between the plates the voltage drops to 50V.
What is the dielectric constant of the inserted material?
What should be the minimum initial speed of the dart so that combination makes a complete circular loop after the collision. find the minimum diameter of the raft that would prevent the diamond from being seen.
what is the electric force between the proton and electron inside of a hydrogen atom? What must the speed of the electron be? Radius=0.47 x 10^-9.
A 3.4-cm-diameter parallel-plate capacitor has a 1.8mm spacing. The electric field strength inside the capacitor is 1.3×105V/m, What is the potential difference across the capacitor
A 1.0 mW HeNe laser with wavelenght 633 nm is shown on a metal. The photocurrent is reduced to zero with stopping potential of 0.50 volts, What is the work function of the metal and what is the cutoff wavelength
An airplane pilot wishes to fly due west. A wind of 88.0 km/h is blowing toward the south. What is the speed of plane over the ground in km/h.
One kilomole of an ideal gas undergoes a free expansion, tripling it's volume. What is the change of entropy of the universe
When using 690 nm light to perform the double slit experiment, the interference in the middle is a bright fringe, If the slits are 2.48 µm apart, at what angle will we observe the first-order dark fringe
A dentist uses a small mirror of radius 45 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 14 mm from the tooth, what is the magnification of the resulting image.
At rest, a car's horn sounds at a frequency of 385 Hz. The horn is sounded while the car is moving down the street. A bicyclist moving in the similar direction with one-third the car's speed hears a frequency of 342 Hz. What is the speed of the ca..
A flight attendant pulls her 65N flight bag a distance of 388m along a level airport floor at a constant velocity. The force she exerts is 38 N at an angle of 51° above horizontal.
What least horsepower must a motor have to be able to drag a 320 box along a level floor at a speed of 1.10 if the coefficient of friction is 0.50.
A bucket filled with dirt of mass 22 kg is suspended by a rope that hangs over a pulley of mass 31kg and radius 0.15 m. everything is at first at rest.
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