Figure Q3 above shows the schematic of a motor on the right pulling the mass on the left. It is known that a kinetic friction force exists between the block and the floor, with it magnitude F, = HN, where ur = 0.3 and Nis the normal force on the block. The mass of the block m is 150 N. From an initial velocity of v: = 0 ms-1 it is required that the block reaches a velocity of v, = 2 ms-1 after 0.9 seconds. a. Identify the required acceleration of the block from initial to a final velocity, assuming a constant acceleration during the movement. b. Calculate the magnitude of force T needed to achieve the acceleration calculated in (a). Do consider the friction on the block in your solution c. It is known that the diameter of the spindle of the electrical motor, d = 5 cm. With the force T calculated in (b), determine the torque required from the motor to achieve this movement. This shall be the required specification of the motor.

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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.