The question is a little confusing. An electromagnetic wave is radiation. One doesn’t emit the other. Take another look at the question and write it again please.
Answer:
Downward
Explanation:
When the upper leg exerts a force on the lower leg and the combined center of gravity of both the legs lies at the center of the lower leg then the line of action of this force will be acting downwards.
- Like for any body which is placed on the other body is under the influence of gravity then the it will exert a force equal to its weight on the lower body in downward direction. Line of action of this force will be through the center of gravity of the upper body and the canter of gravity of both the bodies as a system will be the average their individual centers of the gravity.
Answer:
a) the mole fraction of air in the exiting stream is Xa=0.25 (25%) and for methane Xm=0.75 (75%)
b) the volumetric flow rate is 49.33 L/s
Explanation:
Assuming ideal gas behaviour, then
for air
Pa*Va=Na*R*Ta
for methane
Pm*Vm=Nm*R*Tm
dividing both equations
(Pa/Pm)*(Va/Vm)= (Na/Nm)*(Ta/Tm)
Na/Nm = (Pa/Pm)*(Va/Vm) * (Tm/Ta) = (0.2/0.2)*(20/5)*(300/400) = 1*4*3/4 = 3
Na=3*Nm
therefore the moles of gas of the outflowing stream are (assuming that the methane does not react with the air):
Ng= Na+Nm = 4*Na
the mole fraction of A is
Xa= Na/Ng= Na/(4*Na) = 1/4 (25%)
and
Xm= 1-Xa = 3/4 (75%)
also for the exiting gas
Pg*Vg=Ng*R*Tg = Na*R*Tg + Nm*R*Tg = Pa*Va * (Tg/Ta) + Pm*Vm * (Tg/Tm)
Vg = Va * (Pa/Pg)*(Tg/Ta) + Vm *(Pm/Pg)* (Tg/Tm)
Vg = 20 L/min * (0.2/0.1)*(370/400) + 5 L/min * (0.2/0.1)*(370/300) = 49.33 L/s
Answer:
Nobel gases
Explanation:
Well since Krypton is in a group called the “Noble Gases”, then Krypton is similar to the others; Xenon, Helium, Neon, Argon, and Radon.