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a space station consists of two donut-shaped living chambers aand b that have the radii shown in the figure as the
a 160 kg horizontal beam is supported at each end a 300 kg piano rests a quarter of the way from one end what is the
a ball of mass 0120 kg is dropped from rest from a height of125 m it rebounds from the floor to reach a height of0600 m
four railroad cars each of mass300 x 104 kg are coupled together and coastingalong horizontal tracks at speed vi toward
starting from rest a 52-kg blockslides 240 m down a rough 300degincline the coefficient of kinetic friction between the
a helicopter of mass 3770 kg can create an upward lift forcef when empty it can accelerate straight upward at amaximum
a weight lifter lifts a 320 n set ofweights from ground level to a position over his head a verticaldistance of 185 m
an elastic conducting material is stretched into a circularloop of 110 cm radius it is placedwith its plane
a 117 v potential difference isapplied to a space heater that dissipates 500 w during operationa what is its resistance
at the distance of the earth from the sun the pressureexerted by sunlight is about 10-5 pa how muchforce does this
you are standing on the edge of a turntable with frictionless bearings it is initially rotating when you catch a ball
a wheel free to rotate about its axis that is not frictionless is initially at rest a constant external torque of 52
your task in physics lab is to make a microscope from two lenses one lens has a focal length of 12 rm cm the other a
a person stands on a bathroom scale in a motionless elevator whenthe elevator begins to move the scale briefly reads
you mass 90 kg are a spyentering a high-security building through a skylight 20 m above thef loor your partner is
a gun isfired vertically into a 110 kg block of wood at rest directlyabove it if the bullet has a mass of 210 g and a
radio waves travel at a speed of 17 x 108 ms through ice a radio-wave pulse sent into the antarctic ice reflects off
a softball of mass 0220 kg that is moving with a speed of45 ms in the positive directioncollides head-on and
after 107 s a spinning roulette wheel has slowed down to anangular velocity of 225 rads during this time the wheel has
a uniform meter stick is in static rotational equilibrium when a mass of 220 g is suspended from the 50 cm mark a mass
a 60kg woman balances on the heel of her right shoe whosearea is 05cm2 how much pressure does she exerton the floor how
true or falsea the scalar product cannot have unitsb if the scalar product of two nonzero vectors is zero then they are
a 33 rpm phonograph record reaches its rated speed 18 s after it is turned on what was the angular
the inner and outer surfaces of a cell membrane carry a negativeand positive charge respectively because of these
an elevator is moving downward but has a constand upwardacceleration of a35ms2 at a moment when the elevator speed is