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a copper wire of length l and cross sectional area a is connected to a 120 volt dc power supply the current through the
in the drawing drawing not needed to solve problem the magnetic field has a magnitude of 192 t the rod has a length of
in a skating stunt known as crack-the-whip a number of skaters hold hands and form a straight line they try to skate so
an object falling under the pull of gravity experiences a frictional force of air resistance the magnitude of this
on an essentially frictionless horizontal ice-skating rink a skater moving at 26 ms encounters a rough patch that
a 150 g bullet is fired at a muzzle velocity of 3250 ms from a high powered rifle with a mass of 475 kg and barrel of
a ceiling fan is turned on and a net torque of 22 n middot m is applied to the blades the blades have a total moment of
a 1290-n uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end a w
a block slides down an inclined plane starting from rest and being pushed with a constant acceleration of 520 ms2 over
a person is riding a bicycle and its wheels have an angular velocity of 190 rads then the brakes are applied and the
the earth spins on its axis once a day and orbits the sun once a year 36524 days take the positive direction for the
a 23892u nucleus is moving in the x direction at 50 105 ms when it decays into an alpha particle 42he and a 23490th if
1 consider the case of a wooden block moving along a horizontal tracka make a sketch of k u and wf as a function of
a closed system is observed to have 47 objects in it initially the total energy of the system is 897 j after 51 h have
you have a small electromagnet that consumes 300 w from a residential circuit delivering 120 v at 600 hz using your ac
an electric kettle of 70 omega resistance containing 500 cm3 of water at 10ordmc is connected to the 110 v supply if 10
a well-insulated 00423 microf capacitor is connected across a line carrying a 375 kv rms sinusoidal voltage with
a high-intensity desk lamp is rated at 75 w but its bulb requires only 9 v the lamp contains a transformer that
a person pushes a 160 kg shopping cart at a constant velocity for a distance of 180 m she pushes in a direction 260deg
a transformer has 683 turns in its primary winding and 109 in its secondary winding assuming it has 100 percent
a skier slides horizontally along the snow for a distance of 27 m before coming to rest the coefficient of kinetic
a rotating uniform cylindrical platform of mass 250kg and radius 59m slows down from 40revs to rest in 17 s when the
on an essentially frictionless horizontal ice-skating rink a skater moving at 33 ms encounters a rough patch that
a stone is tied to a string length 0750 m and whirled in a circle at the same constant speed in two different ways
a 40 kg artillery shell was fired from a cannon with an initial speed of 84 ms at a 45deg angle above the ground