A block on a spring is pulled down and then released. Its position equation is given by s(t) = -4 cos(nt), where t represents the time in seconds after being released, and s is in inches, where s = O represents the resting position of the block. a. Find the velocity function. When will the block have the greatest velocity? Does this match what you expect practically (explain)? b. Find the acceleration function. In the first period of motion, when is the block speeding up and slowing down?

Q: B

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.