The average flow rate in the niagara river is 6.0 × 106 10. kg/s, and the water drops 50 m over niagara falls. if all this energy could be harnessed to generate hydroelec- tric power at 90% efficiency, what would be the electric power output?

Explanation:

The power produced by the water falling down the Falls is

where

E = mgh is the potential energy of the water, with m being the mass, g the gravitational acceleration, h the height

t is the time

In this problem we have

us the mass flow rate

h = 50 m is the height

g = 9.8 m/s^2 is the acceleration of gravity

Substituting,

And since the efficiency is only 90%, the power output is

a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..