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a homemade electroscope has 2 pieces of straw hanging from 2strings dangling from a hook the length of the string
a sound wave of frequency 850 hz propagating through air has apressure amplitude of 65 pa what are thea wavelengthb
a precious-stone dealer wishes to find the specific heat capacityof a 0040-kg gemstone the specimenis heated to 950degc
an iron anchor of density 7870 kg m3 appears 200 n lighterin water than in aira what is the volume of the anchorb how
a skater of mass 820 kg initially movesin a straight line at a speed of 540 msthe skater approaches a child of mass
an electromagnetic wave strikes a 147-cm2 section of wall perpendicularly the rms value of the waves magnetic field is
a certain core material has an actual permeability of 440x10-2hm what is the relative permeability of the
a trap door of length and width 165 m is held open at an angleof 650 degrees with respect to the floor a rope
a 205-kg log is pulled up a ramp by meansof a rope that is parallel to the surface of the ramp the ramp isinclined at
a constant horizontal force moves a 50 kg trunk 70 m up a 26deg incline at constant speed the coefficient ofkinetic
an ideal gas has a density of 178kgm3 is contained in avolume of 44810-3 m3 the temperature of the gas is 273k the
a figure skater is spinning at a rate of 10 revs with her armsoutstretched she then draws her arms in to her
a series circuit contains only a resistor and an inductor the voltage v of the generator is fixed if r18omega and
two children standing on opposite sides of a merry-go-round are trying to rotate it they each push in opposite
a missile of mass 105 x102 kg is fired from a plane of mass470 x 103 kginitially moving at a speed of 250 x102 ms if
you step onto a hot beach with your bare feet a nerve impulsegenerated in your foot travels through your nervous system
a bicycle wheel of radius 22 cmis mounted at the middle of an axle 44 cm long the tire and rimweigh 39 n the wheel is
a cube of iron 4cm on a side is floated in a bath of mercury the density of iron is 787 gcm3 what percent of the cubes
the drawing shows a laser beam shining on a plane mirror that isperpendicular to the floor the beams angle of incident
a toy racing car moves with constant speed around the circle when its coordinates are x 0 y 3m its velocity is 6ms i
a boat that travels at a speed of 675 ms in still water isto go directly across a river and back the current flows at
a lead ball is dropped into a lake from a diving board 998 m above the water after entering the water it sinks to the
a uniform electric field of magnitude 300 vm is directed in the positive x direction a 100 microc charge moves from the
a 182 kg weather rocket is loaded with 97 kg of fuel and firedstraight up it accelerates upward at 2998 ms2 for349 s
1 a square loop of wire lies in the plane of the page a decreasing magnetic field is directed into the page the induced