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A three-way 240 V lamp bulb that contains two filaments is rated for 200-400-600 W. One filament burns out. Afterward, the bulb operates at the similar intensity (dissipates energy at the same rate) on its lowest as on its highest switch positions however does not operate at all on the middle position. What are the (a) larger and (b) smaller values of the filament resistances?
1 what is meant by the expression i2r losses in electric circuits?2 name and describe two electrical applications where
Two horses pull a large crate of negligible mass at constant speed across a barn floor by means of two light steel cables. What is the work done by each horse if the box is moved a distance of 30 m
two equally charged particles held 4.0 x 10-3 m apart are released from rest. the initial acceleration of the first
The electric potential at a position located a distance of 19.5 mm from a positive point charge of 8.10x10-9C and 10.3 mm from a second point charge is 1.30kV
A 125.2 carton is pulled up a frictionless baggage ramp inclined at 31.0 above the horizontal by a rope exerting a 75.2 pull parallel to the ramp's surface. What is the net work done on the carton
The hydrogen alpha has a 658.28 nanometer wavelength. What is the shifted wavelenght of the Hydrogen alpha light emitted by stars in the Andromeda as viewd from Earth
A relief airplane is delivering a food package to a group of people stranded on a very small island. After a package is ejected from the plane, how long will it take for it to reach sea level from the time it is ejected
It has been suggested that rotating cylinders about 12 mi long and 5.1 mi in diameter be placed in space and used as colonies. What angular speed should such a cylinder have so that the centripetal acceleration at its surface equals free-fall acce..
Light in air is incident perpendicularly on a sheet of crown glass having an index of refraction of 1.522. Determine both the reflectance and transmittance.
A 60.0 kg pole vaulter running at 12.0 m/s vaults over the bar. Assume that the vaulter's horizontal component of velocity over the bar is 1.0 m/s and disregarding air resistance, how high was the jump?
A physics professor demonstrates the Doppler Effect by tying a 600. Hz sound generator to a 1.00-meter-long rope and whirling it around his head in a horizontal circle at 100 rpm. What are the highest and lowest frequencies heard by a student in the ..
A ten pound car wheel has a moment of inertia of 0.52 kg m2. How much torque is required to stop the wheel in 43.21 s
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