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You have to do 2100Joule of work to push a 90 kilogram crate 2.5 meter up along a slope inclined at 20o. Find the coefficient of static friction between slope and crate?
A 0.2kg flying pig toy is attached to the ceiling with a string. When the pig's wings flap, find the angle the string makes with the vertical
Two forces, 375 N at 11deg and 323 N at 25deg are applied to a car in an effort to accelerate it. If the car has a mass of 3730kg, what magnitiude of acceleration does it have
A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. What is the coefficient of static friction
Two carts with masses of 10.60 kg and 2.50 kg, respectively, move in opposite directions on a frictionless horizontal track with speeds of 6.70 m/s and 3.50 m/s, in that order. The carts stick together after colliding head-on. Find the final speed of..
A 3000-kg Ferris wheel accelerates from rest to an angular speed of 0.17rad/s in 11s, What is the net torque on the wheel
A 150 ohm resistor is connected in series with a 0.250 H inductor. The voltage across the resistor is VR = 3.80 cos (720t) Volts. Derive an expression for the voltage VL across the inductor
A 27 pound meteorite struck a car, leaving a dent 21 cm deep in the trunk. If the meteorite struck the car with a speed of 500 m/s, what was the magnitude of its deceleration, assuming it to be constant.
A balance beam has two clockwise torques applied, 22N @ 5.5m, and 110N @ 2.4 m. Balance is achieved with a 55N force. How far is that force from the balance point
At its farthest point, the three-point line is 7.24 metersaway from the basket in the NBA. At what speed Should he throw the ball
A sled is pulled with a horizontal force of 20 N along a level trail, and the acceleration is found to be 0.35 m/s2. An extra mass m = 4.2 kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coeffic..
A 12.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 3.99 m/s in 1.02..
A converging lens with focal length of 6.0cm is placed 8.0 cm to the right of a diverging lens of focal length of -4.0 cm. A .4 cm tall object is placed 4.0 cm in front of the diverging lens
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