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Susan's 10 kilogram baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30 degree above the floor. The tension is a constant 32.0 N and the coefficient of friction is 0.170. Use work and energy to determine the Paul speed after being pulled 2.80 meter.
Five equal negative point charges -q are placed symmetrically around a circle of radius R as shown. Use a rough approximation to express the magnitude of electric field E at a point on the positive x axis a distance R from the center of the circle..
suppose that you wish to fabricate a uniform wire out of 0.800 g of copper. assume the wire has a resistance r 0.300
A golfer, putting on a green, needs three strokes to "hole the ball." Through the first putt, the ball rolls 5.2 m due east. For the second putt, the ball travels 1.8 m at an angle 20°north of east. The third putt is 0.50 m due north.
Ordinarily there is an electric field in the atmosphere of approximately 100 V/m near the Earth's surface that points downwards. Find the average charge density in the air below 1.4 kilometer
a rock group is playing in a bar. sound emerging from the door spreads uniformly in all directions. the intensity level
At what frequency f do a 1.0 microF capacitor and a 1.0 microH inductor have the same reactance? f=___?___kHz (B) What is the value of the reactance at this frequency? R=___?___ Ohm
a light ray of wavelength 550 nm initially in water enters a transparent substance at an angle of 37 degrees with
a conducting sphere of radius r1 carries a charge q. another conducting sphere has a radius of r2 2r1 but carries the
Infrared light of wavelength 2.5 illuminates a 0.20-mm-diameter hole. What is the angle of the first dark fringe in rad, in deg? and sin (fi)=lambda/D is not the formula
a high speed train is traveling at a speed of 44.7ms when the engineer sounds the 415hz warning horn. the speed of
A 4.2kg object,initially at rest,''explodes''into three objects of equal mass. How much kinetic energy was released in the explosion
A rectangular coil of 100 turns measure 40cm by 20cm. This coil is placed next to an electromagnet which is switched on, what are the induced voltage and current in the coil
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