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SOLVED: 1. Calculate the electrical force between two protons in the nucleus of a helium atom when separated by 2.0 x 10 -15 m.

SOLVED:A beam of charged particles consisting of protons, electrons, deuterons, and singly ionized helium atoms and H2 molecules all pass through a velocity selector, all emerging with speeds of 2.5 ×10^6  m / s. The beam then enters a region of uniform magnetic field B=0.40  T directed perpendicular to their velocity. Compute the radius of curvature of the path of each type of particle.

A helium nucleus has two protons and two neutrons. How many electrons does it take to equal the mass of a helium nucleus?

A gas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid. The temperature of the helium is -6^∘ C at the compressor inlet and 50^∘ C at the turbine inlet. Assuming isentropic efficiencies of 85 percent for both the turbine and the compressor, determine ( a ) the minimum temperature in the cycle, (b) the coefficient of performance, and ( c ) the mass flow rate of the helium for a refrigeration rate of 25 kW. | Numerade

SOLVED: A physicist uses a cylindrical metal can 0.250 m high and 0.090 m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 ×10^4 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls. How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding wall

15 a father uses a helium gas tank to inflate the balloons for his sons birthday party the 0100 m3 volume tank contains gas at 155 atm if each balloon is a sphere of radius 120 cm when fille 76653