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Light from the sun allows a solar cell to move electrons from the positive to the negative terminal, doing 2.4 x 10-19 J of work per electron. What is the emf of this solar cell?
A bag of cement weighing 275 N hangs in equilibrium from three wires as suggested in the figure below. Two of the wires make angles θ1 = 56.0° and θ2 = 42.0° with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2,..
a rifle with a mass of 2.8 kg fired a bullet with a mass of 0.003 kg. the bullet moves with a muzzle velocity of 420 m/s after the rifle is fired
A block of mass 2.50 kg is pushed 2.60 m along a frictionless horizontal table by a constant 20.0 N force directed 25.0° below the horizontal. Determine the work done by the net force on the block
A dockworker applies a constant horizontal force of 79.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 15m in a time 4.50s. What is the mass.
A 100 kg scaffold is 6 m long. It is hanging with two wires, one from each end. A 500 kg box sits 1.6 m from the left end. What is the tension in the left hand side wire
A hockey puck B rests on a smooth surface of ice and is struck by a second puck A , which was originally traveling at v= 40.0m/s, What fraction of the original kinetic energy of puck A dissipates during the collision
If the coefficient of kinetic friction between a 35.0 kg crate and the floor is 0.25, what horizontal force is required to move the crate at a steady speed across the floor
You do 116 J of work while pulling your sister back on a swing, whose chain is 5.0m long, until the swing makes an angle of 32.0° with the vertical
Find the change in entropy in the universe. Now, two identical ideal oxygen gases with the same pressure P=1 atm and the same number of particles N = 10^22, but di erent temperature T1 = 30 C and T2 = 40 C,
A car is moving with constant acceleration along a straight road. Determine how the velocity varies for positive acceleration if the car is initially moving to the right with a speed of 10.0 m/s
A block of mass m = 2.10 kg is pushed a distance d = 4.20 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N, Determine the work done on the block by the applied force
A 1200-turn coil of wire that is 2.1 cm in diameter is in a magnetic field that drops from 0.11 T to 0 in 12 ms. What is the emf of the coil
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