Physics, 27.07.2019 02:20 kealinwiley
Aspherical nuclear reactor of mass 1030 kg in interstellar space is completely surrounded by a thin, nonrigid spherical shell of matter with a mass of 1026 kg (see the figure). the reactor loses 1010 kg/sec of its mass by the emission of electromagnetic radiation. (if this sounds like the description of a star, it's no accident! ) this radiation is completely absorbed by the surrounding shell of matter. what must be the radius of the spherical shell if the repulsion exerted on it reactor thin by the radiation is just great enough to balance the gravitational shell attraction exerted on it by the reactor? (consider the forces exerted on a small portion of the shell.)
Answers: 2
Physics, 22.06.2019 01:10
Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.
Answers: 1
Physics, 22.06.2019 04:00
All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction
Answers: 2
Physics, 22.06.2019 14:20
4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)
Answers: 3
Aspherical nuclear reactor of mass 1030 kg in interstellar space is completely surrounded by a thin,...
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