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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?
a block of mass 2.0 kg is attached to a rod by means of two strings. when the system rotates about the axis of the rod
You have a 1.0m long copper wire. You want to make an N-turn current loop that generates a 1.2mT magnetic field at the center when the current is 2.5A. What will be the diameter of your coil
A football game begins with a kickoff in which the ball travels a horizontal distance of 45 yd and lands on the ground. what is the initial speed of the ball in this case
A 3.50 %u03BCC point charge is placed at the center of a conducting spherical shell. What is the surface charge density (C/m2) on the outer surface
A wheel turns with a constant angular acceleration of 0.600rad/s^2. Through how many revolutions does the wheel turn in this interval
A garden hose with a diameter of 0.67in. has water flowing in it with a speed of 0.82m/s and a pressure of 1.3 atmospheres. Find the pressure in the nozzle
A 150 g baseball is pitched at 50 m/s and is hit straight back at the pitcher at a speed of 60 m/s. What is the magnitude of the average force on the ball
A standard 100 W (120 V) lightbulb contains a 7.40 cm-long tungsten filament. What is the diameter of the filament
It takes a force of 80N to compress the spring of a toy pop gun 0.2m to load a .150kg ball. With what speed will the ball leave the gun
a lead ball is dropped into a lake from a diving board 18 ft. above the water. it hits the water with a certain
With the temperature held constant, the piston of a cylindercontaining a gas is pulled out so that the volume increases from0.1 m3 to 0.3 m3. what is the final pressure
A magnetic field and an electric field, in separate regions of space, have strengths of 1.25 T and 1.25 N/C, respectively. What is the energy density of the magnetic field
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