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What is the ratio of the electric force holding an electron in (an assumed circular) orbit around a hydrogen nucleus (proton) to the gravitational force between the same two charged particles? (mp = 1.67x10-27 kg; qp = +1.6x10-19, qc= -1.6 x10-19 C). (Consider magnitudes only.)
question a cylindrical tank containing oil with a density of 800 kgm3. the depth is 3.0 meters. above the oil is air
a soccer player kicks a soccer ball initially at rest setting it in motion at a velocity of 30 m/s. what is the force exerted on the players foot
At a certain location, Earth's magnetic field of 53 µT is horizontal and directed due north. find the angle between the current direction and due north
A 30-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, How high does she rise during this interval
A copper beaker of mass 0.20 kg contains 0.10 kg of water at 20.0degree C. A block of silver of mass 100 g at 90.0 degree C is added to the beaker of water. The entire system is thermally insulated from the surroundings, (specific heats- copper: 3..
By how much does the potential energy of a 15.0-kg child increase. Find v0.
A charged particle with a charge-to-mass ratio of |q|/m = 5.7 × 108 C/kg travels on a circular path that is perpendicular to a magnetic field whose magnitude is 0.66 T. How much time does it take for the particle to complete one revolution?
A 100-g cube of ice at 0 C is dropped into 1.00 kg of waterthat is originally at 80.0 C. What is the final temperature of the water after it is melted
on a hot day a house is kept cool by an air conditioner. The outside temperature is 32 degrees celsius and the inside temperature is 21 degree celsius. what is the mechanical power that it requires to hold the inside temperature constant
A speed skater goes around a turn that has a radius of 27 m. The skater has a speed of 15 m/s, What is the mass of the skater
A parachutist of 60 kg descends at a constant speed of 4.4 m/s. What is the rate of increase of entropy of the parachute
A telephoto lens with focal length of 120mm has f-numbers ranging from f/2.8 to f/22, What is the diameter of the lens aperture at f/2.8? in millimeters
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