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A 11-g piece of Styrofoam carries a net charge of -0.85 ?C and floats above the center of a large, horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet?
A banana has 0.45 g of potassium. 0.0117% of that potassium is 4019K, What is the activity of the banana
A juvenile elephant has a mass of 300kg. He wishes to fly using his very large ears. find the total surface area of his two ears
A spherical Christmas tree ornament is7.18 cm in diameter.What is magnification of the image ofan object placed 8.6 cm away from the ornament.
The first two dark fringes on one side of the central maximum in a single-slit diffraction pattern are 1.0 mm apart. What is the slit width
A child goes down a playground slide with an acceleration of 1.40. Find out the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 31.0 below the horizontal.
A snowboarder is pulled by a tow rope along a horizontal surface with a constant force of 60 N. How far must the boarder be pulled, starting from rest, so that her final kinetic energy is 500 J.
A 3.0 kg block rests on a 30 degree slope and is attached by a string of neglible mass to a sold drum of mass 0.80 kg and radius 10.0 cm, Find the angular accleration of the drum
A pickup truck is moving at 25 m/s when suddenly the brakes are applied and the truck comes to a stop in 4.7 s. how much time elapses before the tool box strikes the cab
A 15.0 kg block of ice at 0 degrees C falls into Lake Superior, which is a freshwater lake. What is the change in entropy, delta S, of the lake
A positive charge q1 = 2.50 µC on a frictionless horizontal surface is attached to a spring of force constant k, the distance between charges to d = 9.00 cm, Find the value of k
a 100 kg wrecking ball savings on a 15.0 m long cable. if is swings from rest 4.0 m above the lowest piont, what is the tension in the cable at the lowest point
An electron traveling at v = 1.20 x 10^5 m/s passes from (2.00 m, 1.00 m, 3.00m) to (7.00 m, 3.00 m, 1.00 m), What is the force that electron experiences the instant
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