Radioactive materials are to be stored in a spherical container and stored underwater to facilitate convective cooling. the spherical tank is composed of an inner shell made of lead (k=35.3 w/m/k) with an inner radius r1=0.25m and an outer radius r2=0.30m, and an outer shell made of stainless steel (k=15.1 w/m/k) with an outer radius r3=0.31m. the inner cavity is completely filled with radioactive waste that generates heat a a rate q(dot)=5x10^5 w/m^3. the water temperature is 10 c. if the tank is stored in ocean water with h=500 w/m^2/k, find the max temperature in the lead (melting point 328 c). will the lead melt?

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

On a average work day more than work place firs are reorted

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.