Circular motion lab the pointer. (5) using a stopwatch determine the time it takes for 20 orbits. you will have to keep rotating the pole to keep its radius ! (6) attach the mass holder around the pulley and connect it to the rotating mass. add mass to the holder until the rotating mass is directly over the pointer. remember that holder is 50 grams. (7) repeat steps () for different pointer positions

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.