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An electric motor is plugged into a standard 120V electrical service. At startup a current of 23.4A is measured. What is the back emf if an operating current of 5.4A is measured once the motor is operating at speed? If a resistor is added to limit the in-rush (starting) current to 10A. What vaule is needed and what is the operating current with the new resistor added.
Determine the magnitude and direction of the force between two parallel wires 15m long and 6.0cm, Determine the magnitude of the force between two parallel wires
One cubic centimeter of a cumulus contains 250 water drops, which have a typical radius of 10 μm. (a) How many cubic meters of water are in a cylindrical cumulus cloud of height 3.0 km and radius 1.1 km.
A ray of light is incident at an angle of 30 deg. to the normal on an air glass interface. find the angle the refracted ray makes to normal
Two masses are placed on the x axis. The first mass 320kg is located at x = 310cm , the second mass 660kg is at the origin
Particle A carries a charge of 5.0 uC, Particle B is 12.0cm, Find the magnitude and direction of the electric force on A due to B
One displacement vector A has magnitude of 2.78 km and point due north. Another displacement vector B has a magnitude of 7.40 km and also points due north. Provide diagrams and calculate the magnitude and direction of A+B, B-A, A-B.
An object is located to the left of a convex lens whose focal length = +40cm. The magnification produced by the lens = 3.0 m. Calculate the distance through which the object must be moved
Two long, parallel wires are separated by a distance of 2.50cm . The force per unit length that each wire exerts on the other is 3.20×10?5N/m, determine the current in the second wire
The total electric field consists of the vector sum of two parts. One part has a magnitude of E1 = 1300 N/C, Find the magnitude and direction of the total field
A toy train rolls around a horizontal 1.30 diameter track. The coefficient of rolling friction is 0.10.
Two blocks on a frictionless table, A and B, are connected by a massless string. What is the ratio (ma/mb) of the blocks masses
A flint glass plate (n = 1.66) rests on the bottom of an aquarium tank. Calculate the apparent thickness of the plate as viewed from above the water
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