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a portion of nichrome wire of radius 395 mm is to be used in winding a heating coil if the coil must draw a current of
suppose you wish to fabricate a uniform wire from 180 g of copper the wire is to have a resistance of r 0380 and all
suppose the current in a conductor decreases exponentially with time according to the equation it i0e-t where i0 is
the trans-alaskan pipeline is 1300 km long reaching from prudhoe bay to the port of valdez and is subject to
a circuit consists of a 120-v battery connected to three resistors 44ohm 17ohm and 110ohm in seriesa find the current
mercury has a mass mp 318 x 1023 kg an orbital period t 880 days and an orbital radius r 579 x 1010 m assume the
a laser beam is reflected by a plane mirror it is observed that the angle between the incident and reflected beams is
the density of free electrons in gold is 590 times 1028 m-3 the resistivity of gold is at a temperature of 20degc and
a parallel-plate capacitor has a capacitance of 10 mf and charged with a 20 v power supply the power supply is then
a lens for a 35-mm camera has a focal length given by f 49mm a how close to the film should the lens be placed to form
a concave lens has a focal length of -33 cm find the image distance and magnification that results when an object is
two packing crates of masses 100 kg and 500 kg are connected by a light string that passes over a frictionless pulley
a weight lifter lifts a 420 n set of weights from ground level to a position over his head a vertical distance of 170 m
the reel has radius r and moment of inertia i one end of the block of mass m is connected to a spring of force constant
if an electroscope is charged by inductiona it will acquire a negative chargeb it will acquire a positive chargec its
a 1 mf a 2 mf and a 3 mf capacitor are connected in series the combination being connected across a 9 volt batterywhich
at the top of earths atmosphere sunlight has an average intensity of 1350wm2 if the average distance from earth to the
a television is tuned to a station broadcasting at a frequency of 660times107 hz for best reception the rabbit-ear
a mechanic pushes a 240 103 kg car from rest to a speed of v doing 4950 j of work in the process during this time the
a horizontal force of 150 n is used to push a 425 kg packing crate a distance of 690 m on a rough horizontal surface if
a sled weighing 610 n is pulled horizontally across snow so that the coefficient of kinetic friction between sled and
a 26-kg object hangs at one end of a rope that is attached to a support on a railroad car when the car accelerates to
a submerged scuba diver looks up toward the calm surface of a freshwater lake and notes that the sun appears to be 32
1 how does the diameter of the lens affect magnification2 how does the diameter of the lens affect the focal