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a) A lightning rod is a rounded copper rod mounted on top of a building and welded to a heavy copper cable running down into the ground. Lightning rods are used to protect houses and barnes from lightning; the lightning current runs through the copper rather than through the building. Why. Why should the end of the rod be rounded?
b) A solid conductor has a cavity in its interior. Would the presence of a point charge inside the cavity affect the electric field outside the conductor.Why or why not? Would the presence of a point charge outside the conductor affect the electric field inside the cavity? Again, why or why not
c) Explain this statement? ''in a static situation, the electric field at the surface of a conductor can have no component parallel to the surface because this would violate the condition that the charges on the surface are at rest. '' would this same statement be valid for the electric field at the surface of an insulator? Explain why answer and the reason for any differences between the cases of a conductor and an insulator.
750kg racecar took 3s to slow from 32m/s to 15m/s. What was the impluse? what was the average force applied to the brakes
There are 2 spaceships, A and B, that approach the earth from opposite directions. Now according to an observer on spaceship A,she approaches the earth at 0.7c. According to an observer onspaceship B, he approaches the earth at 0.85c.
What is the kinetic energy of a 0.5-kg object moving at a constant speed of 2 m/s?
Suppose you have an electric hot water heater for your house which is an aluminum cylinder which has a 0.56 m radius and is 1.8 m high. The walls are 1.0 cm thick.
Three point charges are arranged on a line. Charge q3 = +5.00 nC and is at the origin. Charge q2 = -3.50 nC and is at x = 5.00cm . Charge q1 is at x = 2.00cm.
A cyinder with a moving piston contains 0.05m^3 of gass at the temperature of 20c and prassure 100kpa. what is the new volume of the gass
A wrecking ball (weight = 5010 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3670 N. As the drawing shows, a support cable runs from the top of the boom to the tractor.
In a double-slit experiment, what is the linear distance on the screen between adjacent maxima if the wavelength is 538 nm
A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.734 diopters. How far is her near point from her eyes
A spring of k=12.00 N/m has a block of mass 11- kg attached to it on a frictionless table. If the block is pulled a distance 0.17m to the right and released from rest, how long would it take the block to return to its equilibrium position? Give yo..
A 340kg piano slides 3.5m down a 29degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.30.
0.75 kg block of ice is sliding by you on a very slippery floor at 2.5 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for 0.003 seconds. The block eventually slides at an angle of 22 de..
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