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Two spherical objects by a mass of 1.05 kg each are placed at a distance of 2.05 m apart. How many electrons need to leave each object so that the net force among them becomes zero?
A direction perpendicular to this initial direction
A 2.2 A current is flowing in a 18 H inductor. A switch is opened, interrupting the current in 2.0 ms. Find the induced emf in the inductor
Two particles are fixed to an x axis: particle 1 of charge-4.00*10-7 C at x = 6.00 cm, and particle 2 of charge +4.00*10-7 C at x = 18.0 cm. Midway between the particles, what is their net electric field?
A motor has coils with a resistance of 28 and operates from a voltage of 235 V. When the motor is operating at its maximum speed, the back emf is 147 V. Find the current in the coils when the motor is first turned on
A ballot box with mass m = 6.0 kilogram slides with speed v= 4.0 m/s across a frictionless floor in the positive direction of the x axis. Find the velocity of the second piece, with mass m2
a large rectangular tub is filled to a depth of 2.60 m with olive oil, which has density 915 kg/m^3. find the force of air pressure on the surface of the oil
A 7430-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. Find the work done by the gravitational force
One particle, of mass m, moves with a speed v in the x-direction, and another particle, of mass 2m, moves with a speed v/2 in the y-direction. What is the velocity of the center of mass of these two particles
The radius of a park merry-go-round is 2.4 m. To start it rotating, you wrap a rope around it and pull with a force of 260 N for 11 s. What is the moment of inertia of the merry-go-round
Two loudspeakers in a plane, 5 m apart, are playing the same frequency. If you stand 14 m in front of the plane of the speakers, What is the frequency of the sound
a nearsighted person cannot see objects clearly beyond 25 cm her far point. if she has no astigmatism and contact
A transformer is to be used to provide power for a computer disk drive that needs 6.6 V (rms) instead of the 120 V (rms) from the wall outlet. Find the number of turns in the secondary
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