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A potential difference V is applied to a wire of cross-section area of 1 unit, length 1 unit, and conductivityσ. You want to change the applied potential differenceand draw out the wire so the power dissipated is increased bya factor of 30 and the current is increased by a factor of 4 . What should be the new values of the length andthe new cross sectional area?
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.
an amplifier supplies 5.0 watts to a perfectly efficient loudspeaker at one end of a 10.0 cm diamter tube filled with
A 1.9-kg mass attached to a spring is displaced 7.6 cm from the equilibrium position. What is the energy of the motion when the mass passes through the equilibrium position
assume that you are diving from 10 meters height in bathing area. how long does it take before you reach the water?no
How long does it take for the grinding wheel to stop ? Through how many radians has the wheel turned during the interval found in.
A point source of light illuminates an aperture 2.00m away. How wide is the aperture
q1. a heavy piece of hanging sculpture is suspended by a 94 cm long 4.6 g steel wire. when the wind blows hard wire
Two charged bodies exert a force of 0.190 N on each other. If they are moved so that they are one-fifth as far apart, what force is exerted
A 5kg block is accelerated at 3 m/s^2 while fighting a frictional force of 25 N. What force needs to be applied to the block
A 25- sample of an ideal gas with is at 250 and 50. The gas is compressed isothermally to one-third of its original volume, then heated at constant volume until its state lies on the adiabatic curve that passes through its original state, and then al..
One end of a wire is attached to a ceiling, and a solid brass ball is tied to the lower end. The tension in the wire is 145 N. What is the radius of the brass ball
a box is sliding down an incline tilted at an angle 14.0deg above horizontal. the box is sliding down the incline at a
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