Mr. David drove from his home to his work place. For the first 1.2 hours, he travelled at a constant speed of 65 km/h. For the
next 2.3 hours, he travelled at a constant speed of 70 km/h.
What was the average speed for the whole journey?
km/h
Enter the answer

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

What sort of waves exhibit the doppler effect?