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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?
Two blocks with masses 500g and 510 g are connected to a rope and hung over a 50g cylinder with a radius of 4 cm. What is the rotational inertia of the cylinder
Five moles of an ideal gas expand isothermally at 100 degrees Celsius to five times its initial volume. Find the heat flow into the system.
A narrow slit 0.072 mm wide is illuminated with monochromatic light, and a diffraction pattern is observed on a screen 4.0 m from the slit. The width of the central maximum of this pattern is 2.8 cm. What is the wavelength of the incident light? How ..
The distance of the earth from the sun is 93000000 miles. Find the speed of the earth in its orbit about the sun
The Sun is a low mass star and so would never have the core fusion reactions of massive stars. Yet, the Sun has iron in its atmosphere, as well as gold, silver and other elements much heavier than iron and why?
a 25.0 kg propeller may be considered a 4.5m long rod spun about its center. What final angular velocity does the propeller have if a torque of 1100 Nm is applied for 1.2 sec
Pre-Lab on Newton's Law of Cooling, Use the model function that you developed to estimate the time it took for the person to drink his coffee at the desirable temperature of 10°F above the room temperature value at McDonald
We did an experiment with newtons third law where we pushed two carts together and measured the force exerted with a computer. We did it with springs in between the carts first, which showed the force of the carts to be equal.
A bowler holds a bowling ball (M=6.5 kg) in the palm of his hand. His upper arm is vertical, his lower arm (1.7 kg) is horizontal. What is the magnitude of the force of the biceps muscle on the lower arm?
On dry land, an athlete weighs 70.8kg . The same athlete, when submerged in a swimming pool and hanging from a scale, Find the total volume V of the submerged athlete
a sodium ion na is neutralized by capturing a 0.5 ev electron. what is the wavelength of the emitted radiation if the
A target in a shooting range consists of a square wooden board of side length S = 0.500 meter and mass mT = 0.750 kg, find the angular speed of the target just after the collision
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