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A 60-W light bulb consumes 60 W of electrical power. It radiates almost all of this power, some of it in the form of visible light and some of it in the form of heat. Find the intensity (W/m2 ) of the total radiated energy (light and heat) at a distance 4.1 m from the light bulb.
When the lights of a car are switched on, an ammeter in series with them reads 7.52 A and a voltmeter connected across them reads 12.0 V, find the current through the starting motor
To determine the center of mass of her body, a student lies on aplank of mass m=10 kg. The plank is supported by two scales at itsends. The distance between the scales is 2.5 meters. The left scalereads 339 N and the right reads 171 N.
a heat engine is being designed to have a carnot efficiency of 73 when operating between two heat reservoirs.a if the
A person stands on a bathroom scale in a motionless elevator. Calculate the magnitude of the acceleration of the elevator
If a rubber ball of mass 1.0 kg is dropped from a height of 2.0 m and rebounds on the first bounce to 0.75 of the height from which it was dropped, how much energy is dissipated through the collision with the floor?
A spherical shell contains three charged objects. The first and second objects have a charge of -19.0 nC and 37.0 nC respectively. What is the charge on the third object
at 20.0degc a mainly silicon resistor has a resistance of 365 o and a tungsten resistor has a resistance of 752 o. at
an electron moves in a circular path perpendicular to a constant magnetic field of magnitude 1.00 mt. the angular
A 75-W, 110-V bulb is connected in parallel with a 40-W, 110-Vbulb. What is the net resistance
A piece of wood floats in oil of density 800 kgm with 25% of its volume above the surface of the oil. If the piece of wood is placed in water, it will float with what percentage of its volume above the water?
Radio waves of very long wavelength can penetrate farther intoseawater than those of shorter wavelength. What is their wavelength in air
A 50 kg sled is subject to a net force of 20 N pushing in the direction of the sled motion as it is moving over a horizontal surface for a distance of 11 m after having started from rest. find the work done by friction while the sled is on the incl..
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