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two sound sources produce sound waves the first source has an intensity level of 380 wm2 and the second source has an
a 265-g copper coin at 215degc drops 600 m to the ground assume the specific heat of copper is 387 jkg middot degca
a sphere of radius r1245cm and mass m120kg starts from rest and rolls without slipping down a 30 degree incline that is
a nuclear power plant has a maximum steam temperature of 280degrees c it produces 790mw of electric power in the
at high altitudes water boils at a temperature lower than 1000deg c due to the lower air pressure a rule of thumb
an electron traveling 107 ms to the right enters a constant electric field that slows it to rest awhat is the potential
a major league pitcher of mass 100kg is standing on a skateboard of mass 200kg holding a baseball the skateboard is
when a particular inductor is connected to a sinusoidal voltage with a 245 v amplitude a peak current of 79 a appears
a 512-turn circular-loop coil with a diam- eter of 174 cm is initially aligned so that its plane is perpendicular to
a sprinter of mass 714 kg runs at a constant speed of 111 ms in a straight line find the extra force the sprinter must
the r factor for housing insulation gives the thermal resistance in units of ft2 degf hbtu a good wall for harsh
a small package rests on the horizontal dashboard of a car if s 0340 what is the minimum acceleration of the car that
you are holding a bulletin board weighing 868 n in place against a wall while your friend secures it to the wall to
the two stars in a binary star system have masses 22times1030 and 65times1030 they are separated by 21times1012 what
a hypothetical large slingshot is stretched 12 m to launch a 170 g projectile with speed sufficient to escape from
each of the three helicopter rotor blades shown in the figure is 520 m long and has a mass of 286 kg the rotor is
a 103 kg fullback runs at the line of scrimmage a constant force of 3399 n must be exerted on him to bring him to rest
an aluminum block slides along a horizontal surface the block has an initial speed of 110 ms and an initial temperature
a 125-kg crate slides along a horizontal frictionless surface at a constant speed of 40 ms the crate then slides down a
two metal plates are held together by two steel rivets each of diameter 024 cm and length 13 cm how much force must be
a river 1080 m wide flows toward the south at 356 mmin a girl on the west bank wishes to reach the east bank in the
a tennis player receives a shot with the ball 00600 kg traveling horizontally at 560 ms and returns the shot with the
a large beach ball weighs 560g when there is no air inside fully inflated it has a circumference of 252cm a estimate
a plane is headed due west with an air speed of 224 ms the wind blows south at 190 ms find the velocity of the plane