when is the angular momentum of a system constant? when is the angular momentum of a system constant? when no net external torqu
1 answer:
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Answer:
the power that can be generated by the river is 117.6 MW
Explanation:
Given that;
Volume flow rate of river v = 240 m³/s
Height above the lake surface a h = 50 m
Amount of power can be generated from this river water after the dam is filled = ?
Now the collected water in the dam contains potential energy which is used for the power generation,
hence, total mechanical energy is due to potential energy alone.
= m(gh)
first we determine the mass flow rate of the fluid m
m = p×v
where p is density ( 1000 kg/m³
so we substitute
m = 1000kg/m³ × 240 m³/s
m = 240000 kg/s
so we plug in our values into ( = m(gh) kJ/kg )
= 240000 × 9.8 × 50
= 117600000 W
= 117.6 MW
Therefore, the power that can be generated by the river is 117.6 MW
Answer:
The time taken by to arrive on an area of
is
.
Explanation:
Given the intensity of the energy is
And the arriving energy is
Also, the area in which energy is being arriving is
Now, we will use relation between energy , intensity of energy
, area
and time
.
Where energy is in Joule, intensity is in , area is in
and time is in seconds.
The equation is
So, the time taken by to arrive on an area of
is
.