A fan is to accelerate quiescent air to a velocity of 12.5 m/s at a rate of 9 m3/s. Determine the minimum power that must be sup
1 answer:
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The formula for kinetic energy is 
. Thus, the equation for velocity is 
.
The Young modulus is given by:
where
F is the force applied
is the initial length of the wire
is the cross-sectional area of the wire
is the stretch of the wire
The wire in the problem stretches by
of its length, this means
We can also calculate the area of the wire; its radius is in fact half the diameter:
and so the area is
We know the force applied to the wire, F=20 N, so now we have everything to calculate the Young modulus:
where
F is the force applied
The wire in the problem stretches by
We can also calculate the area of the wire; its radius is in fact half the diameter:
and so the area is
We know the force applied to the wire, F=20 N, so now we have everything to calculate the Young modulus: