Chris and desiree are resting on an offshore raft after a swim. they estimate that 3.0 m separates the trough from the adjacent crest of each surface wave on the lake. they count 12 crests that pass by the raft in 20.0 s. how fast are the waves moving?

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.

Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.

What is the answer to these problems 30 pt