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An electron in the beam of a typical television picture tube is accelerated through a potential difference of 20,000 V before it strikes the face of the tube. What is the speed of the electron? what is the eneregy of the electron in joules? what is the energy of the electron in electron volts?
In the Bohr model of the hydrogen atom, an electron in the 3rd excited state moves at a speed of 2.43 105 m/s, What is the effective current associated with this orbiting ele
An ac generator has a frequency of 7.4 kHz and a voltage of 41 V. When an inductor is connected between the terminals of this generator, What is the inductance of the inducto
A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 2.80 s for the ball to reach its maximum height. (a) Find th
The periodic time of simple pendulum varies directly as the mass(m) of a Bob, length (l) of the place where the pendulum is suspended. Determine the expression of periodic t
A ball on a light string moves in a vertical circle. Describe and analyze the motion of this system. Be sure to consider the effects of gravity and tension. Is this system in
The lumberjack runs to the other end of the log, attaining a velocity of +4.74 m/s relative to the shore, and then hops onto an identical floating log that is initially at r
The coils of a motor's rotor have resistance of 2.0 Ω. When the motor runs at full speed, powered by 115V linevoltage it draws a current of 9A. What is the back electromagne
During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward
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