They are limited and costly to produce. It is not cost effective to utilize these forms of energy currently.
Answer:
The speed of the water shoot out of the hole is 20 m/s.
(d) is correct option.
Explanation:
Given that,
Height = 20 m
We need to calculate the velocity
Using formula Bernoulli equation
![\dfrac{1}{2}\rho v_{1}^2+\rho gh_{1}=\dfrac{1}{2}\rho v_{2}^2+\rho gh_{2}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7D%5Crho%20v_%7B1%7D%5E2%2B%5Crho%20gh_%7B1%7D%3D%5Cdfrac%7B1%7D%7B2%7D%5Crho%20v_%7B2%7D%5E2%2B%5Crho%20gh_%7B2%7D)
Where,
v₁= initial velocity
v₂=final velocity
h₁=total height
h₂=height of the hole from the base
Put the value into the formula
![v_{1}^2=2g(h_{2}-h_{1})](https://tex.z-dn.net/?f=v_%7B1%7D%5E2%3D2g%28h_%7B2%7D-h_%7B1%7D%29)
![v_{1}=\sqrt{2g(h_{2}-h_{1})}](https://tex.z-dn.net/?f=v_%7B1%7D%3D%5Csqrt%7B2g%28h_%7B2%7D-h_%7B1%7D%29%7D)
![v_{1}=\sqrt{2\times9.8\times(20-0.005)}](https://tex.z-dn.net/?f=v_%7B1%7D%3D%5Csqrt%7B2%5Ctimes9.8%5Ctimes%2820-0.005%29%7D)
![v_{1}=19.7\ m/s= approximate\ 20\ m/s](https://tex.z-dn.net/?f=v_%7B1%7D%3D19.7%5C%20m%2Fs%3D%20approximate%5C%2020%5C%20m%2Fs)
Hence, The speed of the water shoot out of the hole is 20 m/s.
Answer:
Lenz’s law states that an induced magnetic field in a conductor opposes the applied flux through the conductor.
Explanation:
According to the Lenz's law, the direction of induced e.m.f is such that it generates a current which in turn produces a magnetic field that would oppose the change causing it.
In other words, the direction of any magnetic induction effect is such that it opposes the cause of the effect.
Therefore; an induced magnetic field in a conductor, opposes the applied flux through the conductor.
<span>If
you notice that two waves combine and a part of the resulting wave has
less light intensity than either of the individual waves, you're
observing destructive interference. </span><span>Destructive interference happens when the two waves that combine have amplitudes with opposite signs,which results in subtraction- combined wave with a lower amplitude.</span>