Answer:
B. 152.64
Explanation:
The average value of a sinusoidal waveform taken over half cycle is given by
or simplifying it further results in;
We are given
Hence option B is the right answer
Please note:
The average value of a pure sinusoidal wave over a full cycle (0 to 360°) is always zero since the positive and negative half cancel out each other due to being symmetric.
This is why we always take average over half cycle (0 to 180°).
Answer:
Explanation:
a) - Taking enthalpy from the ideal air structure that is :
Given,
Then, we have to apply the equation of the energy rate balance.
After applying that we have:
Then, we have to put values in the equation.
b) - Here, we have to apply the equation of the continuity.
Then, we have to put values in the equation.
Then, the values are :
and,
Then, we have to put values in the equation.
<h2>Question:</h2>
Which of the following is NOT a problem associated with surface mining?
<h2>Answer:</h2>
<u>Oil</u><u> </u><u>spills</u><u> </u>
<h2>
<u>#CARRYONLEARNING</u><u> </u></h2><h2>
<u>#STUDYWELL</u><u> </u></h2>
Answer:
Q = 62 ( since we are instructed not to include the units in the answer)
Explanation:
Given that:
Q = ???
Now the gas expands at constant pressure until its volume doubles
i.e if
Using Charles Law; since pressure is constant
mass of He =number of moles of He × molecular weight of He
mass of He = 3 kg × 4
mass of He = 12 kg
mass of Ar =number of moles of Ar × molecular weight of Ar
mass of He = 7 kg × 40
mass of He = 280 kg
Now; the amount of Heat Q transferred =
From gas table
∴ Q =
Q =
Q = 62 MJ
Q = 62 ( since we are instructed not to include the units in the answer)
Answer:
10.007
Explanation:
Assuming we have to find out the compression ratio of the engine
Given information
Cubic capacity of the engine, V = 245 cc
Clearance volume, V_c = 27.2 cc
over square-ratio = 1.1
thus,
D/L = 1.1
where,
D is the bore
L is the stroke
Now,
Volume of the engine V =
plugging values we get
245 =
Solving we get D =7 cm
therefore, L= 7/1.1 =6.36 cm
Now,
the compression ratio is given as:
r =(V+V_c)/V_c
on substituting the values, we get
r = (245+27.2)/27.2 =10.007
Hence, Compression ratio = 10.007