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The dielectric in a capacitor serves two purposes. It increases the capacitance, compared to an otherwise identical capacitor with an air gap, and it increases the maximum potential difference the capacitor can support. If the electric field in a material is sufficiently strong, the material will suddenly become able to conduct, creating a spark. The critical field strength, at which breakdown occurs, is 3.0 MV/m for air, but 60 MV/m for Teflon.
A parallel-plate capacitor consists of two square plates 13cm on a side, spaced 0.60mm apart with only air between them. What is the maximum energy that can be stored by the capacitor?
What is the maximum energy that can be stored if the plates are separated by a 0.60-mm-thick Teflon sheet?
A hockey stick is swung with an average angular acceleration of 1.5 rad/s2. What is an angular velocity of the stick when it strikes the ball at the end of 0.8 second swing.
Power transmission lines often use a form of electric current called alternating current, but in many regions, such as the Province of Quebec, high-voltage direct-current lines are used instead, What is the power loss due to resistance in the line
The distance between two telephone poles is 31 m. When a 1.25 kg bird lands on the telephone wire midway between the poles, the wire sags 0.116 m. How much tension in the wire does the bird produce
A satellite weighing 500 kg is in a circular orbit around the earth. It takes exactly 3 hours to go around the earth. What is the force of gravity on this satellite
Given that the station is on average 420 km above the Earth find its speed (in m/s) and the magnitude of centripetal acceleration
A thermo pane window consists of two glass panes, each 0.50 centimeter thick, with a 1 centimeter thick sealed layer of air in between. If the inside surface temperature is 23.2°C and the outside surface temperature is 0.0°C, obtain the rate of ene..
A sound wave in air has a frequency of 500 Hz and a wavelength of 0.68 m. What is the air temperature
A force vector has a magnitude of 588 N and points at an angle of 40 degrees below the positive x axis. What is the x scalar component of the vector
Calculate the pressure difference between the air pipe and the water pipe
What least amount heat is needed to bring 20-g of water at 20C to the boiling point and completely boil it away.
Brain injuries in auto accidents. Brain injuries generally occur any time the brain's acceleration reaches 100 g for even a short time. Find the maximum speed with which the car can strike the barrier without causing brain injury, using an airbag
question the si unit of length is the meter which is defined as the length equal to 1650763.73 wavelengths of the light
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