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a 25 kg child sits in a swing supported by two chains each 27 m long if the tension in each chain at the lowest point
an electric generator has a 20-turn coil of area 004 m2 rotating uniformly at 60 revs in a magnetic field of 10
a nonconducting solid sphere of radius 820 cm has a uniform volume charge density the magnitude of the electric field
an immersion heater used to boil water for a single cup of tea plugs into a 120 v outlet and is rated at 300 wa what is
you do 220 j of work pulling your sister back on a swing whose chain is 500 m long until the swing makes an angle of
a 600kg car is going over a curve with radius of 120m that is banked at an angle 25 degree with a speed 30ms the
a 360-kg child takes a ride on a ferris wheel that rotates four times each minute and has a diameter of 200 ma what is
the output voltage of an ac generator is given by v 200 v sin 70t the generator is connected across a 190- resistora
an electron with an initial speed of 550times105ms is brought to rest by an electric fieldwhat was the potential
a load of bricks with mass 156 hangs from one end of a rope that passes over a small frictionless pulley a
consider a thick spherical shell of inner radius r2 and outer radius r the shell has a charge q uniformly distributed
a factory worker pushes a 280kg crate a distance of 48m along a level floor at constant velocity by pushing downward at
a sled weighs 100 n it is held in place on a frictionless 20 degree slope by a rope attached to a stake at the top of
samantha pushes a 500 n crate up a ramp 250 m in length and inclined at 100 degrees with the horizontal what potential
a 700 kg ball falls from a 200m shelf just as it hits the floor what is its kinetic energy when it hits the
a home owner who lives beside a 60 hz power line decides to harvest some energy from the oscillating field the person
a source of radio waves is emitted from the center of our galaxy 18 x 104 light years away 15 pw picowatts of power
a kid picks up a toy of mass 139g from the floor the kid lifts the toy 422cm above the floora how much work does the
an explosion breaks an object into two pieces one of which has 15 times the mass of the other if 7800 j were released
a 0260 kg croquet ball makes an elastic head-on collision with a second ball initially at rest the second ball moves
a neutron collides elastically with a helium nucleus at rest initially whose mass is four times that of the neutron the
a rod of length 5m with miss per unit lengthx12 extends in the x-direction find the mass and the center of mass of the
the power output of a car engine running at 2600 rpm is 600 kwa- how much work is done per cycle if the engines thermal
a box of mass 275 kg slides 40 m down an inclined plane of 30deg jim pushes against the box to keep it from
a nonconducting solid sphere of radius 112 cm has a uniform volume charge density the magnitude of the electric field