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some clocks that are powered by an ac voltage use the ac frequencyto keep time the power company makes this possible by
a 15 g bullet strikes and becomes embedded in a 110 kg block of wood placed on a horizontal surface just in front of
a gun is fired vertically into a 140 kg block of wood at rest directly above it if the bullet has a mass of 210 g and a
a symmetric bi-covex lens has radii of curvature r and athickness of d find its focal length using matrix methods
when light of wavelength 350 nm is incident on a metalsurface the stopping potential of the photoelectrons is 0500
a 473-kg skater is standing at rest in front of a wall bypushing against the wall she propels herself backward with
a poorly tuned yugo can accelerate from rest to a speedof 28 ms in 20 sa what is the average acceleration of the carb
the drawing shows a collision between two puckson an air-hockey table puck a has a mass of 00190 kg and ismoving along
a 90 ohm resistor and a 60 ohm resistor are connected in series with a power supplya the voltage drop across the 60 ohm
a lazy susan consists of a heavy plastic disk mounted on africtionless bearing resting on a vertical shaft through
the magnetic field of the earth at a certain location is directedvertically downward and has a magnitude of 500 microt
a 675 kg circus performer slides410 m down a pole to the circusfloor starting from resta what is the kinetic energy of
two ants race across a table 66 cm long one travels at442 cms and the other at 3cms when the first one crosses
a 20-kg object sitting at rest is struck elastically in a head-on collision with a 10-kg object initially moving at 30
a dentist uses a mirror to examine a tooth that is 075 cm in front of the mirror the image of the toothis formed 100 cm
a 37 kg bucket of water is raised from a well by a rope ifthe upward acceleration of the bucket is 41 meters per
benjamin applies a force f over a distance x to a ropeconnected to a set of pulleys this raises a block of weight w
a generator is made from a set of 7000 loops of area 500 cm2rotating at an angular frequency of 600 radians per second
a 055 kg book moves vertically upwarda distance of 10 m and thenvertically downward 10 m returning toits initial
1 a duck is floating on a lake with 22 of its volume beneath thewater what is the average density of the duck2 a 050 m
a 5-a current is maintained in a simple circuit that consistsof a resistor between the terminals of an idealbattery
a 82 kg diver steps off a 13 m tower and drops from rest straight down intothe water if he comes to rest 45 mbeneath
a uniform electric field exists in a region between two oppositely charged plates an electron is released from rest at
a 98 kg waterskier is being pulled at a constant velocity the horizontalpulling force is 270na find the magnitude of
a skier starts from rest at the top of a hill that is inclined at95degwith the horizontal the hillside is 150 m long