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In a simple model of the hydrogen atom, the electron revolves in a circular orbit around the proton with a speed of 2.2*106 m/s. Determine the radius of the electron's orbit.
Suppose the ruler in procedure 3 is asymmetrical, balancing at the58.2cm mark. The ruler is now supported at the44.3cm mark, Find the mass of the ruler
An electric motor is used to lift an elevator and its load to aheight of 20m. at which rate is the energy supplied to the motor
A ladder 4.9 m long leans against a wall inside a spaceship. From the point of view of a person on the ship, the base of the ladder is 2.9 m from the wall, and the top of the ladder is 3.9 m above the floor. The spaceship moves past the Earth with a ..
A block of mass, m1 is 5 kg. It is lying on a frictional horizontal surface. Evaluate the magnitude of the net force on the hanging block
You want to construct a simple pendulum with a period of 2 seconds. what would be the new period of your pendulum
A 827 cm3 gold nugget and a 827 cm3 aluminum block are immersed in water. Which object experiences the greater buoyant force
A block is resting on a ramp with coefficient of friction between the blockand the ramp being .350, What is the max angle that the block can make without slipping
An ore car of mass 4 000kg rolls downhill on tracks from a mine. At the end of the tracks, 10 m lower in elevation, is a spring with k = 400 000 N/m. How much is spring compressed in stopping the ore car? Ignore friction.
A conducting bar with a mass of 0.155 kg and a length of 16.0 cm is suspended touching two vertical electrical contacts which form an electric circuit with a battery that has an electric potential of 8.5 V. What is the resistance R that exists in t..
A plane wave of wavelength 580 nm is incident on a slit with a width of a = 0.50 mm. A thin converging lens of focal length +80 cm is placed between the slit, How far is the screen from the lens
A 120-V motor has mechanical power output of 3.00 hp. It is 80.0% efficient inconverting power that it takes in by electrical transmission in to mechanical power. Find the current in the motor.
A horizontal force of with a magnitude of F = 220 N is applied to block 1, What is the magnitude of the net force on the middle block
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