A box weighs 65.9 N on Earth. What is is the mass?

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.

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

Acar of mass 800kg is moving at a speed of 2.2m/s.