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A bag contains one counter, known to be either white or black. A white counter is put in, the bag is shaken, and a counter is drawn out, which proves to be white. What is now the chance of drawing a white counter? [Notice that the state of the bag, after the operations, is exactly identical to its state before.]
an electric motor rotating a workshop grinding wheel at a rate of 9.70 101 revmin is switched off. assume the wheel has
A steel cylinder with a radius of 5cm and a length of 4cm is placed in end to end thermal contact with a copper cylinder of the same dimensions. If the free ends of the two cylinders are maintained at constant temperatures of 95C(steel) and 15C (cop..
A 60-W incandescent bulb with a tungsten filament is connected to a 120-V power supply. the power dissipated by the cold bulb is
an electron with initial velocity v0 1.64 times 105 ms enters a region 1.0 cm long where it is electrically
For the following questions, express your answers in terms of q. (a) How much charge ends up on sphere C? (b) What is the total charge on the three spheres before they are allowed to touch each other? (c) What is the total charge on the three sphe..
In vacuum, an electromagnetic wave has speed c = 2.9979 × 108 m/s and frequency f = 6.0 × 1014 Hertz. Obtain the wavelength of the wave in the material
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.703 A) sin [(257 rad/s)t]. Determine the resistance of the bulb's filament
A block of ice starts from rest on an apartment building's roof, which slopes at 41° below the horizontal. How far from the building does the block strike the ground
A platinum resistance thermometer has resistances of 206.97 W when placed in a 0°C ice bath and 257.43 W, What is the melting point of potassium
A mass m = 2.4 kg is at the end of a horizontal spring of spring constant k = 265 N/m on a frictionless horizontal surface. Calculate the angular frequency of the oscillation in rad/seconds
Two children each of mass 20 kilogram ride on the perimeter of a small merry go round that is rotating at rate of 0.25 rev/s the merry go round is a solid disk of mass 30 kilogram and radius 3 meter. Find final rate of rotation
Write the expressions for the electric and magnetic fields of a uniform plane wave propagating in an arbitrary direction and list all the conditions to be satisfied by the electric field, magnetic field, and propagation vectors.
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