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In the bohr model of the hydrogen atom an electron (mass 9.1*10^-31kg) orbits a proton at a distance of 5.3*10^-11 m. The protonpulls on the electron with an electrical force of 8.2*10^-8 N. How many revolutions per second does the electron make?
a point charge 6.50rm nc is at the center of a cube with sides of length 0.300rm m. what is the electric flux through
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 20.0 cm, Find the electric field just inside and just outside the paint layer
A wheel is freely rotating at 85.0 rev/min and has a mass of 27.5 Kg and a radius of .7 m. If the wheel can be stopped in 7 seconds by using a towel and exerting an inward force of 55.0 N, what is the coefficient of kinetic friction between the wheel..
The primary coil of an ideal transformer has 650 turns, and the secondary coil has 260 turns. Assume the primary coil carries 15 A at a voltage of 120 V. What is the output current of the secondary coil
a frictionless pulley which can be modeled as a0.90 kg solid cylinder with a 0.34 m radius has a rope going over it. what is the angular acceleration of the pulley
an average-sized man is sitting in a big tanning room. the tanning radiation from the room walls is controlled by
The United States and South Korean soccer teams are playing in the first round of the World Cup. find its velocity at the time of interception
A thin uniform 15 kg post, 1.75 m long is held vertically using a cable and is attached to a 5kg mass and a pivot at its bottom end. Find the angular acceleration of the post about the pivot just after the cable breaks
An elastic cord is 66 cm long when a weight of 66 N hangs from it but is 86 cm long when a weight of 76 N hangs from it. What is the "spring" constant k of the elastic cord.
an rl circuit with l 6.00 h and an rc circuit with c 4.00 microf have the same time constant. a if the two circuits
a block of mass m1 2.00 kg on a frictionless inclined plane of angle 32.0deg is connected by a cord over a massless
A 1300 kg truck drives around a flat 230 m -diameter circular race course at 27 m/s. What is the magnitude of the net force on the car
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