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In some places, insect "zappers," by their blue lights, are a familiar sight on a summer's night. These devices utilize a high voltage to electrocute insects. One such device uses an ac voltage of 4200 V, which is obtained from a standard 120-V outlet with means of a transformer. If the primary coil has 24 turns, how many turns are in the secondary coil?
question two insulating spheres have radii r1 and r2 masses m1 and m2 and uniformly distributed charges -q1 and q2.
two wires are kept tight between the same pair of supports. the tensions in the wires are in the ratio 41 the radii are
You and a friend have been given the task of designing a display for the Physics building that will demonstrate the strength of the electric force, calculate the necessary amount of charge on the marble for a reasonable ramp angle of 15 degrees
A 1-kg block on the Moon has a weight of 1.62 N. Given that the Moon's radius is 1740 km, calculate the Moon's mass
A lens for a 35-mm camera has a focal length given by f = 67 mm. What is the magnification of the image on the film
9.00g of aluminium at 200 degree celsius and 21.0g of copper are dropped 53.0cm^3 of ethyl alcohol at 15 degrees celsius. What is the initial temperature of the copper
an electron with an initial horizontal velocity of magnitude 0.95 multiplied by 109 cms travels into the region between
a uniform electric field of magnitude 325 vm is directed in the negative y direction. the coordinates of point a are
an electron moves in a circular path perpendicular to a constant magnetic field with a magnitude of 2.50 mt. the
A large arm model was constructed with a free arm which weights 1 kg, an additional weight of 1 kg is supported by the arm at a distance of 12 cm from the pivot. What is the total torque of the resistance
a bowling ball has a mass of 7.2 kg and radius of 0.11m. a billiard ball has a mass of 0.38 kg and a radius of 0.028 m.
the starter motor of a car engine draws an electric current of 20.0 a from the battery. the copper wire to the motor is
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