Hi im being timed please help im trying to raise my F in the class before graduation
1 answer:
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The correct answer to the question is : 4427.75 J.
EXPLANATION :
As per the question, the mass of the nitrogen gas m = 22.25 gram.
The latent heat of vaporization of nitrogen
As per the question, the nitrogen gas will condense. During condensation, the nitrogen gas will lose or release heat equal to its latent heat.
Hence, the heat released by nitrogen gas Q =
= 22.25 × 199.0 J
= 4427.75 J.
Hence, the amount of heat released will be 4427.75 J.
Answer : The time required is, 16.1 minutes.
Explanation :
First we have to calculate the amount of heat required to increase the temperature is:
where,
Q = amount of heat required = ?
m = mass
= density of air =
V = volume of air
C = specific heat of air =
= change in temperature =
Now put all the given values in above formula, we get:
Now we have to calculate the time required.
Formula used :
where,
t = time required = ?
Q = amount of heat required =
P = power = 1500 W
Now put all the given values in above formula, we get:
Thus, the time required is, 16.1 minutes.
Explanation:
It is known that the relation between power and work is as follows.
Power =
As it is given that power is 370 watts and time is 40 minutes. First, we will convert minutes into seconds as follows.
= 2400 sec
Now, total power or energy is calculated as follows.
Power =
=
= 888000 J
As 1 kJ = 1000 J. So, convert 888000 J into kJ as follows.
= 888 kJ
therefore, we can conclude that total energy expended by the cyclist is 888 kJ.