Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air environment for which T 325 K and h 20 W/m2 K. Assuming the properties of the steel to be k 40 W/mK, 7800 kg/m3 , and c 600 J/kg K, estimate the time required for the cooling process.

note:

solution is attached in word form due to error in mathematical equation. furthermore i also attach Screenshot of solution in word due to different version of MS Office please find the attachment

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

the force on the thing and the distance the force moves the thing