Physics, 23.03.2020 16:56 Destinysills9325
A circular ice skating rink 20 m in diameter is enclosed by a large hemispherical dome with diameter of 30 m. The ice is 2 cm thick. At time t = 0, the refrigeration system fails. Assume that the dome and ice behave as blackbodies at 20ºC and 0ºC, respectively. Neglect convection heat transfer. How long will the ice take to melt?
Answers: 2
Physics, 22.06.2019 10:50
Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.
Answers: 3
Physics, 22.06.2019 17:00
Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?
Answers: 2
Physics, 22.06.2019 19:40
It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc
Answers: 1
A circular ice skating rink 20 m in diameter is enclosed by a large hemispherical dome with diameter...
Social Studies, 26.07.2019 03:30
Social Studies, 26.07.2019 03:30
History, 26.07.2019 03:30
Chemistry, 26.07.2019 03:30
History, 26.07.2019 03:30