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Question: What is the magnitude of an electric field that balances the weight of a plastic sphere of mass 6.2 g that has been charged to -3.0 nC?
A trap door, of length and width 2.35 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
A battery (V = 2.4 V) contains E = 2.2 kJ of energy. It is connected to a P = 8 W light bulb. Input an expression for the light bulb's resistance
A 0.4 kg tennis ball is dropped from rest at a height of 3.6 m onto a hard floor. Over what time does the force act in bringing the ball to rest
A 2.0 kg mass is projected from the edge of the top of a 20mtall building with a velocity of 24m/s at some unknown angle abovethe horizontal. find the kinetic energy of the mass just before it strikes the ground
A car is travelling with a velocity of + 88.0 km/h. It accelerates at a constant rate of 20 m/s2. If the acceleration lasts for 5.6s, what is the final velocity of the car.
A 100kg mass is on an inclined plane of 30 degrees. It's connected to a second unknown mass that hangs over a frictionless pulley. What is the unknown mass required to maintain an acceleration down the place of 1m per sec
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. what must be the focal length of the eyepiece
A 7.0cm--diameter disk emits light uniformly from its surface. 20cm from this disk, along its axis, is an 9.0cm--diameter opaque black disk; the faces of the two disks are parallel. find the diameter of the completely dark part of this shadow
Suppose a neutrino is created and has an energy of 34 MeV. Determine the de Broglie wavelengthof the neutrino
A jet airplane is in level flight. The mass of the airplane is m = 8830 kg. find the magnitude of the lift force acting on the plane
It takes 16J of energy to move a 0.30-mC charge from one plate of a 15-?F capacitor to the other, How much charge is on each plat
An electron is orbiting a proton under the Coulomb force in a hydrogen atom at a radius of 0.52 × 10-10 m
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