Acondenser of a heat pump uses r-134a as a working fluid. the fluid enters the condenser (after leaving the compressor) at a pressure of 120 psia and 140 f and a volume flow rate of 1.5 ft3/s.
the condenser cools the r-134a to a temperature of 90.49 f and a quality of 50% at the same pressure as it entered.
based on steady flow through the condenser what is the heat flow rejected to the outside air in btu/s to three significant digits?
answer & explanation:
"the force on a cutting tool are 2600n vertically downward" sounds a little unusual, since most of the time, the tool is above the object to be cut in such a way that the force acting "on the tool" is upwards. we will accept the statement as it is (downwards).
since the two forces are acting at right angles to each other, the resultant can be found using pythagoras theorem, namely
resultant = sqrt(2600^2+2100^2) = 3342 n (approx.)
the angle can be found using the arctangent function, or
angle = arctangent(2600/2100) = 51.07 degrees below the horizontal, since the 2600 n force is acting downwards.
d is the answer
on/off components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated.
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