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Problems with solutions

I.D Level Problem Problem Topic
547 High school When an electric cell is connected to a circuit , electrons flow away from the negative terminals in the circuit . But within the cell, electrons flow to the negative terminals . Explain ? . . . continues
Click to Purchase Solution		 Current & Electricity
548 High school Can copper wire and aluminum wire of the same length have the same resistance ? Explain ? . . . continues
Click to Purchase Solution		 Current & Electricity
549 High school A bird stands on and electric transmission line carrying 2500 A (figure at “click here” ) . The line has 2.5 x 10^-5 ohm resistance per meter and the bird’s feet are 4.0 cm apart . What voltage does the bird feel ? . . . continues
Click to Purchase Solution		 Current & Electricity
550 High school A length of aluminum wire is connected to a precision 10.00 V power supply , and a current of 0.4212 A is precisely measured at 20.0 degreeC. The wire is placed in a new environment of unknown temperature where the measured current is 0.3618A . What is the unknown temperature ? . . . continues
Click to Purchase Solution		 Current & Electricity
551 High school Estimate at what temperature copper will have the same resistivity as tungsten does at 20 degreeC ? . . . continues
Click to Purchase Solution		 Current & Electricity
552 High school A 100-W light bulb has a resistance of about 12 ohm When cold ( 20 degreeC) and 140 ohm when on (hot) . Estimate the temperature of the filament when”on “ assuming an average temperature coefficient of resistivity ‘infinite’ = 0.0060 (Cdegree)^-1 . . . . continues
Click to Purchase Solution		 Current & Electricity
556 High school A bicycle has wheel of radius 0.28 m . Each wheel has a rotational inertia of 0.094 kg.m^2 about its axle . The total mass of the bicycle including the wheels and the rider is 79 kg . When coasting at constant speed , What fraction of the total kinetic energy of the bicycle (including rider) is the rotational kinetic energy of the wheels ? . . . continues
Click to Purchase Solution		 Rotational Mechanics
554 High school A rectangular solid made of carbon has sides lying along the x,y and z axes. Whose lengths are 1.0 cm. 2.0 cm. and 4.0 cm , respectively (see the figre at “click here”) . Determine the resistance for current that flows through the solid in

(a) the x direction,

(b) the y direction

(c) the z direction

Assume t . . . continues
Click to Purchase Solution		 Current & Electricity
555 High school 10.0 m wire consists of 5.0 m of copper followed by 5.0 m of aluminum of equal diameter (both 1.0 mm) . A voltage difference of 80V is placed across the composite wire .

(a) What is the total resistance of the wire ?

(b) What is the current flow through the wire ?

(b) What is the voltage across the aluminum part a . . . continues
Click to Purchase Solution

 Current & Electricity
557 High school A flywheel of mass 185 kg has an effective radius of 0.62 m (assume the mass is concentrated along a circumference located at the effective radius of the flywheel )

(a) What torque is required to bring this wheel from rest to a speed of 122 rpm in a time interval of 28.2 s ?

(b) How much work is done during the 28.2 s ?

. . . continues
Click to Purchase Solution		 Rotational Mechanics
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