Car a travels with the speed of 6 m/s and car b travels with speed of 10 m/s in the opposite direction. what is the speed of car b with respect to car a?

1. 4 m/s
2. 6 m/s
3. 10 m/s
4. 16 m/s

The softest and hardest minerals are: softest hardest

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.

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.