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In the Bohr model of the hydrogen atom, an electron in the9thexcited state moves at a speed of2.70104m/s in a circular path of radius4.2810-9m. What is the effective current associated with this orbiting electron? mA
A ball is thrown from the window of a high-rise building with an initial velocity of 5.1 m/s at an angle of 22 deg. how fast is the ball travelling when it hits the (horizontal) ground
A 1410-kg racecar is driving around a circular track of radius 161 m. What is the magnitude of the net force acting on the vehicle at this time and the force's direction relative to the velocity
Two kids decide to race from one end of a 20 meter long moving sidewalk to the other and back. Phillip runs on the sidewalk at 2.0 meters/sec (relative to the sidewalk). Who wins the race
How large does the radius R of the dish have to be to achieve an electric field vector amplitude of 0.1 rm mV/m at the receiver.
The potiential energy of a + 2 * 10^-6 C charge decreases from 0.06J to 0.02J, What is the change in electric potiental between these two points
After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 1/2 their initial speed
A 5.25\; kg block starts at the top of a 12.1\; m long incline that has an angle of 10\deg to the horizontal. How much Kinetic Energy was lost in the collision
A super ball, made of rubblerlike plastic, is thrown against a hard smooth wall. What is the magnitude of the impulse delivered by the wall
You fly your 15 m spaceship, parallel to the ship's length with a speed of c/3 to your friend. How long is your spaceship as observed by your friend
A wire is 1.50 m long and has a diameter of 1.5. The tensile modulus of the wire is 6.20 x 10^10 N /m. what is the increase in length of the wire
A Wheatstone bridge is connected to a nine volt battery and is balanced when R1 = 6.3 k?, R2 = 3.3 k?, and R3 = 9.7354 k?
A step-down transformer has a turns ratio of 1:10, and its primary is connected across the terminals of a standard 120-V wall socket. What power P is dissipated in the resistor
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