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how many square meters of pv would it take to provide 1kwabout 13 of the power needed per person for health and
an automobiles battery is connected to an electric motor that isused to move up a load the battery stays at a constant
at the tropics the water close to the surface of the oceanis hotter than the deep water would the second law ofther
a curved portion of a highway under construction has aradius of 520 m the legal speed limit of this highway is 100 kmha
a force of 400 n accelerates a 50-kg block at 60ms2 along ahorizontal surfacea how large is the frictional forceb what
you push a 325 n trunk up a 20 degree inclined plane at a constantvelocity by exerting a 211 n force parallel to the
a 50 kg ball is whirled on a 12 m string so that the ballmoves in uniform circular motion above the horizontal plane
a lead brick with the dimensions 60 cm leftto right 50 cm front to back and 20 cm top to bottom rests on arough solid
elaine went to her outside faucet to fill a 00189m3 bucket with water to wash her car water exits with a speed of 061ms
a car is negotiating a flat circular curve of radius 50 m with aspeed of 20 ms the maximum centripetal force provided
a world-class sprinter accelerates to his maximum speed in41 s he then maintains this speedfor the remainder of a 100-m
an automobile and a truck start from rest atthe same instant with the automobile initially at some distancebehind the
a mass of 50 kg is suspended from a steel wire of diameter 10 mmand length 112 m how much will the wire stretch the
a massless spring of length b and spring constantk connects two particles of masses m1 andm2 the system rests on a
a uniform 14-kg rod that is 075 m long is suspended at rest from the ceiling by two springs one at each end both
the index of dispersion for flint glass is 1615 for light ofwavelength 700 nm and 1665 for light of wavelength 400nm a
a point source of white light is located 3 meters from the lensin the previous problem on its axis the locations of
a 7900 kg car accelerates from rest at the top of a drivewaythat is sloped at an angle of 167 degrees with the
a weight lifter lifts a set of weights a vertical distance of 156 meters if a constant net force of 379 newtons is
a spring-loaded pellet gun is designed to fire 330 g projectiles horizontally at a speed of479 msa if the spring is
a spring is hung from a ceiling and an object attached to itslower end stretches the spring by a distance of 500 cm
a jet of water squirts out horizontally from a very small hole nearthe bottom of a storage tank if the hole is 150m
a 19 kg box slides 40 m down the frictionless ramp shownin the figure then collides with a spring whose spring
a golf ball strikes a smooth hard floor at an angle of 30 degreesto the normal and rebounds at the same angle the mass
in an experiment of specific heat there are mixed 196 g of aluminumat 107degc with 523 g of water at 186 degca