Determine if the following statements are true or false. If a statement is false, correct it so that it is true. a. Both watt and joule per second are units of power.
b. Frictional force acts in the direction of the motion of an object.
c. Power exerted is directly proportional to the time take to perform work.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.