What causes seasons to occur?
2 answers:
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The change in potential energy of an object is given by
where
m is the mass of the object
g is the gravitational acceleration
is the increase in altitude of the object
In our problem,
is the mass of the book, 
and
is the increase in altitude of the book, so its variation of potential energy is
where
m is the mass of the object
g is the gravitational acceleration
In our problem,
Answer with Explanation:
We are given that
Diameter=0.030 m
Length of sprue==0.200 m
Metal volume flow rate,Q=0.03
Q= because 1 minute=60 seconds
Let 1 for the top and 2 for the bottom
Pressure at the top and bottom of the sprue is atmospheric
Substitute the values
Reynolds number=
Substitute the values then we get
Reynolds number=
Reynolds number=42525
The Reynolds number is greater than 4000 .Therefore, the flow is turbulent.