Answer:
From first law of thermodynamics(energy conservation)
Qa= Qr+W
Qa=Heat added to the engine
Qr=heat rejected from the engine
W=work output from the engine
Second law:
It is impossible to construct a heat engine that will deliver the work with out rejecting heat.
In other word ,if engine take heat then it will reject some amount heat and will deliver some amount of work.
1.
QH=6 kW,
QL=4 kW,
W=2 kW
6 KW= 4 + 2 KW
It satisfy the first law.
Here heat is also rejected from the engine that is why it satisfy second law.
2.
QH=6 kW, QL=0 kW, W=6 kW
This satisfy first law but does not satisfy second law because heat rejection is zero.
3.
QH=6 kW , QL=2 kW, W=5 kW
This does not satisfy first as well as second law.Because summation of heat rejection and work can not be greater than heat addition or we can say that energy is not conserve.
4.
QH=6 kW, QL=6 kW, W=0 kW
This satisfy first law only and does not satisfy second law.
I think downwards as that's how most saw's work.
3/4 x 1 1/2 inches (19 x 38 mm) is the actual size for 1x2 stick of lumber,
1 1/2 x 3 1/2 inches (38 x 89 mm) is the actually size for a 2x4 stick of lumber,
Plywood is usually sold in 4 x 8-foot sheets. The most common nominal thicknesses of plywood are 1/2 inch and 3/4 inch, but once again the actual sizes are slightly different. A sheet of 1/2-inch plywood is really 15/32 inch thick, while a 3/4-inch sheet is 23/32 inch thick.
Hopefully this answers your question, I apologize if it doesn’t :)
It’s a run-on sentence, rewritten it should be : John and Mary just broke up, so you will not be seeing them together this afternoon.
