If no heat is lost to the surroundings, how much heat must be added to raise the temperature from 20.0 ∘c to 85.0 ∘c ?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.