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A positively charged He+ atom has one electron in the shell and two protons in the nucleus. In a classic model of the atom, in a certain state, this electron is in a circular orbit around the nucleus by an angular momentum of 2.584×10-34Js. What is the radius of the orbit?
In an experiment, 200 g of aluminum (with a specific heat of 900 J/kg·K) at 100°C is mixed with 48.0 g of water (4186 J/kg·K) at 20°C, What is the entropy change of the aluminum
In 35.0 s, a pump delivers 0.550 m3 of oil into barrels on a platform 25.0 m above the pump intake pipe. The density of the oil is 0.820 g/cm3. Compute the work done by the pump. Compute the power produced by the pump.
A 9.00 x 15.0 swimming pool slopes linearly from a 1.00 depth at one end to a 3.80 depth at the other. What is the mass of water in the pool
a train moving at a constant speed of 58.0 kmh moves east for 45.0 min then in a direction 56.0deg east of due north
Starting at rest, two students stand on 12.5-kg sleds, which point away from each other on ice, and they pass a 5.50-kg medicine ball back and forth, How fast is the student on the right moving right after catching the ball
A crude model of the human vocal tract treats it as a pipe closed at one end. Find the effective length of the vocal tract in a person whose fundamental tone is 550Hz . Sound speed in air at body temperature is 354 m/s.
An AC generator is to have a maximum output of 340 V. Find the maximum current induced in the coil
A car accelerates uniformly from rest and covers a distance of 71 m in 5.6 s. If the diameter of a tire is 42 cm, 1.) Find the angular acceleration of the wheel.
A boy whirls a ball on a string in a horizontal circle of radius 0.8 meter, such that the centripetal acceleration is equal to g. Calculate the frequency of the ball in revolutions per minute
The human eye can barely detect a star whose intensity at the earth's surface is 1.6E-11W/m2. how many photons per second enter the eye from the star
Two electric charges q1 = +10 ?C and q2 = -20 ?C are located 0.35 m apart. How much work is required to double the distance between the charges
it has been suggested that rotating cylinders about 10 mi long and 5.0 mi in diameter be placed in space and used as
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