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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.
helium he a monatomic gas fills a 0.033 m3 container. the pressure of the gas is 5.5 times 105 pa. how long would a
If this system is used with a detector with an intrinsic pulse height resolution of 4%, what will be the expected overall pulse height resolution
Draw vectors indicating the normal force. suppose that the weight of the femur is negligible compared to the applied downward force.
A small object with a momentum magnitude 6.0 kg m/s approaches head on a target at rest. What is the magnitude of the small objects momentum change
The Calorie (or kcal) is another energy unit and is commonly used to measure food energy (as well as heat). How many Calories would you burn walking up a flight of stairs for an hour
Imagine you had two identical springs, each with spring constant k. what is the effective spring constant of this system
There is a uniform electric field throughout the region, given (in N/C) by E = 6.1i + 7.5j + 1.8k, What is the total flux through the five non-shaded faces
Find the work done by an ideal engine which extracts 11500.0 J of heat from its hot reservoir while operating between 530.0 K and 310.0 K
Conceptual Example 14 provides useful background for this problem. A playground carousel is free to rotate about its center on frictionless bearings, What is the person's mass
An elevator cab in the New York Marriott Marquis has a mass of 4500 kg and can carry a maximum load of 1800 kg. what power is required of the force moving the cab to maintain that speed
The total electric flux coming out of a cubical box, that is 28.0 cm on a side, is 94 GNm^2/C, How many coulombs of charge are enclosed by the box
You want to create an electric field at location. where would you place an electron to produce this filed at the origin
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