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A balloon, which is negatively charged by rubbing,clings to a wall. Does this mean that the wall is positively charged? why does the balloon eventually fall?
The atomic number of lead is 82. The alpha particle is a helium nucleus, with atomic number 2.
An old trick to find out if a train is coming is to put your ear on the rails of the track. Why is this more effective than just listening for the sounds the train makes in air.
A 50 kg box is being pushed a distance of 7.0 m across the floor by a force whose magnitude is 164 N. The force is parallel to the displacement of the box.
Assume that the cell is floating on the surface of water, and that the water surface has a coefficient of friction of u=0.300. You now want to use a laser to move cell horizontally, along the surface of the water.
Two point charges 2.4 and 6.50 are 0.10 apart. Point is midway between them; point is 8.00×10-2 from and 6.00×10-2 from . Take the electric potential to be zero at infinity. Find out the work done by the electric field on a charge of 2.50 that tra..
Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle, as the drawing shows. The magnitude of each of the charges is 7.1 µC, and the lengths of the sides o..
Suppose I have two infinite wires, one on the y axis and one on the x axis, each charged uniformly with lamda C/m. Find an expression for the electric field E at any point in the x and y plane as a function of x and y.
A single electron orbits a lithium nucleus that contains three protons (+3e). The radius of the orbit is 2.20 × 10-11 m. Determine the kinetic energy of the electron.
A straight rod of length L = 22.2 cm, carries a uniform charge, ? = 3.00 × 10-6 C/m, What is the magnitude of the electric field at yP = 50.0 cm
A long straight horizontal wire carries a current I = 2.40Ato the left. What is the magnitude F of the magnitude force on the charge
Three point charges are arranged along the x axis. Charge q1=-4 nC is located at x=0.240m and charge q2=2.10 nC is at x=-0.350m, What is the direction of the net force on q3
A person walks first at a constant speed of 5.10 m/s along a straight line from point to point and then back along the line from to at a constant speed of 2.95 m/s. (a) What is her average speed over the entire trip? (b) What is her average veloci..
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