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A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of 9.00×10-8 F and to ensure that the capacitor will be able to withstand a potential difference of 4.5 kV?
A ray of light makes an angle of 25 degrees with the normal to a plane mirror. through what angle is the reflected ray rotated
A certain car battery with a 12.0 V emf has an initial charge of 178 A•h. assume that the potential across the terminals stays constant until the battery is totally discharged, for how long in hours can it deliver energy at the rate of 115 W.
three forces when added produce a resultant force that is 100N pointing 63° above the positive x-axis. what are the magnitude and direction of the third force
Type A nerve fibers in humans can conduct nerve impulses at speeds up to 140m/s, How fast are the nerve impulses in miles per hour
A long string is wrapped around a 6.60 diameter cylinder, initially at rest, that is free to rotate on an axle. The string is then pulled with a constant acceleration of 1.70 until 1.30 of string has been unwound. If the string unwinds without slippi..
You are on an airplane traveling 30° south of due west at 100.0 m/s with respect to the air. What is the heading of the plane with respect to the ground
straight upward at +72.5 m/s from a height of 96.0 m, at the edge of a sheer cliff. The projectile falls, just missing the cliff and hitting the ground below. Find the time it takes to hit the ground at the base of the cliff
An aluminium cup of 180 cm3 capacities is totally filled with glycerin at 18° C. How much glycerin (in cubic cm) would spill out of the cup if temperature of both the cup and glycerin is increased to 33° C? (The linear expansion coefficient of alumin..
If F(r) is the force on an object as a function of of radius r, show that the "tidal" force on an object of lenght delta r is delta F= (dF/dr)delta r
Two carts collide in a perfectly elastic collision. Cart A has a mass of 0.5 kg and an initial velocity of 0.19 m/s. What is the final speed of each cart
A spring with an unstrained length of 0.074 m and a spring constant of 2.4 N/m hangs vertically downward from the ceiling, What is the magnitude of the external electric field
A 94-kg fullback is running at 3.7m/s to the east and is stopped in 0.85 s by a head-on tackle by a tackler running due west. Calculate the original momentum of the fullback
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