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A parallel-plate capacitor made of circular plates of radius 85 cm separated by 0.20 cm is charged to a potential difference of 1000 volts by a battery. Then a sheet of Teflon film is pushed between the plates, completely filling the gap between them. How much additional charge flows from the battery to one of the plates when the Teflon film is inserted?
A circular coil with one turn is in a perpendicular (time dependent) magnetic field given by B = 1.400 - 0.0500 t Tesla, where time t is in seconds. Calculate the radius of the coil
Two astronauts of equal mass 76 kg are holding on to opposite ends of a straight rope in space. The length of the rope between them is 18meters. What is the new angular velocity of the two astronauts
When a 5.5 cm long pencil is arranged perpendicular to a convex mirror's optical axis at a distance of 29 cm from the mirror, its image is 2.8 cm tall.
what would the image distance be (pay attention to sign)? cm d. Could the new image be projected on a screen?
A plastic bag is filled with nitrogen at atmospheric pressure and 27.0 oC. If hot air is used instead of nitrogen, what is the required volume of the balloon if the air inside can be maintained at 39.0 oC
A plane sinusoidal electromagnetic wave carries 16.0 J of energy through a small window of area 0.20m2 in 10.0 s. What is the intensity of the wave
A mass-spring system is in simple harmonic motion. It has a spatial frequency F and amplitude A. what fraction of the system energy is kinetic
A wave has an angular frequency of 110 rad/s, Calculate the angular wave number and the speed of the wave
Calculate the wavelength of light in vacuum that has a frequency of 6.1 105 Hz. Calculate the energy of one photon of such light in vacuum
A typical American family uses 700 kWh of electricity a month. On average, what is the resistance of a household
A research balloon bound for the stratosphere is filled at sea level with 800 m3 of helium whose initial temperature is 285 K. What is the temperature of the helium
The height of a helicopter above the ground is given by h = 2.95t^3, where h is in meters and t is in seconds. At t = 2.50 s, the helicopter releases a small mailbag.
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