A 4 kg. block of copper is removed from a freezer where its temperature was maintained at -23 Co . How much heat does the copper absorb as it is warmed to -3.1 Co ? (The specific heat capacity of copper is 390fraction numerator J over denominator k g space C to the power of ring operator end fraction)

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?