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runner a is initially 20 mi west of aflagpole and is running with a constant velocity of 40 mih due east runner b is
three polarizers are stacked with a successive change in angle30 if the initial intensity of the incident
a retired bank president can easily read the fine print of thefinancial page when the newspaper is held no closer than
a 30kg object is subject to a restoring force the potentialenergy of the object as a function of the distance from
two copper blocks each of mass 100kg initially have differenttemperatures 20 degree celsius and 28 degree celsius the
a carnot engine operates between reservoirs whose temperatures are650k and 350k to improve the efficiency of the engine
a buckyball is a molecule consisting of 60 carbon atoms arranged ina soccer ball like shape its has an atomic weight of
two forces are acting on an object force 1 has a magnitude of330 n pointing due north force 2 has a magnitude of 881
an ultraviolet lamp emits light of wavelength 400nm at the rate of400w an infrared lamp emits light of wavelength 700nm
a hockey player hits a punk so that it comes to rest in 9s after sliding 30 m on the ice determine a the initial
an experimenter arranges to trigger two flash bulbs simultaneouslyproducing a big flash located at the origin of his
a20 kg wagon is pulled along the level ground by a rope inclined at30 degrees above the horizontal a friction force of
a 900 kg car is going 20 ms along a level road how large a constant retarding force is required to stop it in a
when a 58-g tennis ball is served it accelerates from rest to aspeed of 39 ms the impact with theracket gives the ball
the speed of a bobsled is increasing because it has an accelerationof 21 ms2 at a given instantin time the forces
consider a head-on collision between two hydrogen atoms bothinitially in their ground state and moving with the same
a balloon is filled with helium at a pressure of 10 105 pathe balloon is at a temperature of 23degc and has a radius
a solid sphere of moment of inertia 25 mr2 rolls without slipping down an incline plane of 30 degrees from a height of
a rocket of mass 45105 kg is in flight its thrust is directed at anangle of 505deg above the horizontaland has a
a rocket rises vertically from rest with an acceleration of32 ms2 until it runs outof fuel at an altitude of 1000 m
a tennis player standing 122 mfrom the net hits the ball at 360degabove the horizontal to clear the net at the apex of
a shavingcosmetic mirror is designed to magnify your face by afactor of 13 when your face is placed 200 cm in front of
a stone is kicked so that it leaves the ground with an initialvelocity of 10 ms at an angle of 37 degrees the stone is
a spaceships leave earth in opposite directions each with a speedof 050c with respect to eartha what is the velocity of
a 0280 kg croquet ball makes an elastic head-on collisionwith a second ball initially at rest the second ball moves