Water flows over a section of niagara falls at the rate of 1.1 × 106 kg/s and falls 50.0 m. how much power is generated by the falling water? the acceleration of gravity if 9.81 m/s 2 . answer in units of w.

5.395 × 10^8 Watts

We are given;

We are required to calculate the power that is generated by the falling water

But; work done = Force × distance

Therefore;

Power = (F × d) ÷ time

The rate is 1.1 × 10^ 6 Kg/s

But, 1 kg = 9.81 N

Therefore, the rate is equivalent to 1.079 × 10^7 N/s

Thus,

Power = Rate (N/s) × distance

           = 1.079 × 10^7 N/s × 50.0 m

           = 5.395 × 10^8 Watts

The power generated from the falling water is 5.395 × 10^8 Watts

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27