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Compare the electric force holding the electron in orbit (r=0.53×10?10m) around the proton nucleus of the hydrogen atom, with the gravitational force between the same electron and proton. What is the ratio of these two forces?
A 160 g ball on a 70.70 cm long string is swung in a vertical circle about a point 184 cm above the floor. The string all of a sudden breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 543 cm above th..
What provided the added kinetic energy? None of these is correct. the momentum of the platform the man moving the weights further away from his body the man pulling the weights closer to his body
A fireworks rocket is launched vertically into the night sky with an initial speed of 40 m/s. find the magnitude and direction of the second piece
A beam of electrons passes by a single slit and a beam of protons passes by a second, but identical slit. If the electrons and protons have the similar speed, that beam would experience the greatest amount of diffraction? Clarify your answer.
A boy whirls a stone using an r-m long string in a horizontal circle h m above the ground. The string broke, and the stone flies off horizontally and strike the ground x m away.The velocity with which the stone flies off the circle is? The centrip..
Four particles are held in place at the corners of a square with sides of length L. Each particle has a charge q and mass m. (a) What is the potential energy of the system of charges.
A movable piston having a mass of 7kg and a cross-sectional area of 6 cm2 traps 0.2 mol of an ideal gas in a vertical cylinder. The piston slides without friction in the cylinder. The outside of the cylinder is kept at atmospheric pressure, 1.013×..
When a 5.5 cm long pencil is arranged perpendicular to a convex mirror's optical axis at a distance of 29 cm from the mirror, its image is 2.8 cm tall. (a) What is the mirror's focal length? (b) How tall is the pencil's image if the pencil is move..
A stone is dropped at t = 0. A second stone, with 2 times the mass of the first, is dropped from same point at t = 190 ms. (a) How far below the release point is the center of mass of two stones at t = 390 ms? (Neither stone has yet reached the gr..
Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. find the width of the central bright circle on the screen
Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 40cm diameter Styrofoam sphere in water? Assume the volume of the mass is negligible compared to that of the sphere.
If an average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second .
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