A car is seen by a pedestrian on a street corner to be moving down the road at 7 m/s. From the frame of reference of a person in the backseat, how fast does the pedestrian on the street corner appear to be 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.

Two technicians are discussing a starter that clicks repeatedly when the key is turned to the crank position. technician a says the solenoid hold-in winding is open. technician b says the solenoid pull-in winding is open. who is correct?

For most stars, what does a higher temperature tend to to with? a lower luminosity a higher luminositya red color none of the above