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An electric motor in a hair dryer is running at normal speedand, thus, is drawing a relatively small current. Whathappens to the current drawn by the motor if the shaft is preventedfrom turning, so the back emf is suddenly reduced to zero? Remembering that the wire in the coil of the motor has someresistance, what happens to the temperature of the coil? Justify your answers.
Determine the smallest thickness of the shaft if the allowable shear stress is ?allow=150MPa and the shaft is restricted not to twist more than 0.08rad
Calculate the maximum electric field associated with a laser beam operated with a 10 mW power supply and a beam diameter of 1.0 mm
Two radio-frequency point sources separated by 1.5 m are radiating in phase with ? = 0.30 m. How many maxima does it detect
A charged particle of mass .0020kg is subjected to a 5.0T magnetic field that acts at a right angle to its motion. what is the magnitude of the charge on the particle
A circular coil having 19 turns and a radius of R = 19.2cm carries a current of 3.30A. It is placed in a uniform magnetic field of 62.0mT. What is the magnitude of the torque acting on the coil
A sample of helium-4 behaves as an ideal gas as it is heated at constant pressure from 292 K to 402 K. If 19 J of work is done by the gas during this process, what is the mass of helium present?
assume a spherical planet P has a uniform density of 4.72*10^3 kg/m^3 and a radius R=3604 km. For a parcel that weighs 64 N on the surface of the (spherical) earth.
A light bulb has a tungsten filament. When the bulb is just turned on and its temperature is 20? C, the current in the bulb is 0.86 A. What is then the temperature of the filament
Two cars collide at an intersection. Car , with a mass of 1800 , is going from west to east, while car , of mass 1300 , is going from north to south at 16.0. How fast was car going just before the collision
The pilot of an airplane traveling 180 km/h wants to drop supplies to flood victims isolated on a patch of land 150 m below. The supplies should be dropped explain how many seconds before the plane is directly overhead?
A uniform electric field points midway between the positive x and y axies. Its strength is 100Volts/m. Find the location of the point where the total electrid field is zero
For the circuit in the figure (Figure 1) , R = 300? ,L = 0.860H and C = 5.00?F . When the source is operated at the resonance frequency, Determine the current amplitude through the resistor
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