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1 assuming the pump and the air in it comprise the system what is the sign of w when you compress the airanswer a wgt0
you push a 20 kg box from an elevation of zero up a hill you exerta force of 200 n for 6 m and the box speeds up
a convertible travels down a straight level road at a slow speedof 13 kmh a person in the car throws a ball with a
a hydrogen atom initially in its ground state n 1absorbs a photon and ends up in the state for which n 3a what is the
a girl leaves a physics classroom and walks 10m north to a drinking fountain then she turns and walks 30m south to an
a drop of water on a countertop reflects light from a flower held330 cm directly above it the flowersdiameter is 210 cm
a torque of 012nm is applied to an egg beatera if the eggbeater starts at rest what is its angular momentum after 065sb
a ball rolls down the track starting from rest at a height of h1 20m the ball is traveling horizontally when it leaves
a student sits at rest on a piano stool that can rotate withoutfriction the moment of inertia of the student -stool
a worker uses a wheelbarrow to haul 225 lb of brick the handlesare located 400 ft from the axle the center of the load
a stroboscope is a light that flashes on and off at a constantrate it can be used to illuminate a rotating object and
how much work must be done to accelerate a baton from rest to an angular speed of 74 rads about its center consider the
linearly polarized light is incident on a piece of polarizingmaterial what is the ratio of the transmitted light
after getting anbsp drink of water a hamster jumps onto an exercise wheel for a run afew seconds later the hamster is
yellow light travels 0680 times as fast in a certain type of plastic than in a vacuum what is the index of refraction
a helicopter propeller blade starts from rest and experiences aconstant angular acceleration of 180rads2 find the speed
an 85-kg skier is sliding down a ski slope the slope makes an angle of 23degrees above the horizontal directiona what
a roller coaster starts from rest at top of a hill 700 m highthe car travels to the bottom of the next hillmeasuring
an iron bolt is used to connect two iron plates together the boltmust withstand shear forces up to about 3200 n
a cart loaded with bricks has atotal mass of 238 kg and is pulled at constant speed by a rope the rope isinclined at
the drawing shows a collision between two pucks on an air-hockeytable puck a has a mass of 00190 kg and is moving along
consider a long circular cylinder of radius r bisected by a planeparallel to the axis of the cylinder with the two
a 100-kg test rocket is fired vertically from cape canaveral its fuel gives it a kinetic energy of 1960-j by the time
an individual lifts a 95-kg weight to a height of 213 m when the weight is held overhead what is the potential energy
a 2 kg mass hangs motionless from a partially stretched spring having a spring constant of 191 nm what is the magnitude