As your hand moves back and forth to generate longitudinal pulses in a spiral spring, your hand completes 2.4 back-and-forth cycles every 6.54 s. The velocity of the pulse in the spring is 0.832 cm/s. What is the wavelength? Answer in units of m.

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.