Acopper cylinder with a diameter of 3 in is initially at a uniform temperature of 70 f. how long after being placed in a medium at 1000 f with an associated convective heat‐transfer coefficient of 4 btu/h ft2 f will the temperature at the center of the cylinder reach 500 f, if the height of the cylinder is (a) 3 in? (b) 6 in? (c) 12 in? (d) 24 in? (e) 5 ft?

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b.s. and b.s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed