We know, Potential Energy = Force * Height
Here, F = 40 N
h = 5 m
Substitute their values,
U = 40 * 5
U = 200 J
In short, Your Answer would be Option A
Hope this helps!
Answer:
c) 100,000 m/s
Explanation:
You need to take the same wave length from the top graph and bottom one, so let's take half a wave length then in the top one that is 0.005, but in the bottom one it's 2000/4 = 500 because they are smaller and there are 4 half waves before you get to 2000, whereas in the top one there is 1 half wave before you get to 0.005 on the graph.
Now use speed = distance / time
speed = 500 / 0.005 = 100 000 m/s
Answer:

Explanation:
The Work-Energy Theorem is applied herein:

The number of turns needed to stop the grindstone is:

![n = \frac{(15\,kg)\cdot (0.186\,m)^{2}\cdot [(1.83\,\frac{rev}{min} )\cdot (\frac{2\pi\,rad}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )]^{2}}{4\cdot (0.80)\cdot (8.82\,N)\cdot(0.186\,m)\cdot 2\pi}](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7B%2815%5C%2Ckg%29%5Ccdot%20%280.186%5C%2Cm%29%5E%7B2%7D%5Ccdot%20%5B%281.83%5C%2C%5Cfrac%7Brev%7D%7Bmin%7D%20%29%5Ccdot%20%28%5Cfrac%7B2%5Cpi%5C%2Crad%7D%7B1%5C%2Crev%7D%20%29%5Ccdot%20%28%5Cfrac%7B1%5C%2Cmin%7D%7B60%5C%2Cs%7D%20%29%5D%5E%7B2%7D%7D%7B4%5Ccdot%20%280.80%29%5Ccdot%20%288.82%5C%2CN%29%5Ccdot%280.186%5C%2Cm%29%5Ccdot%202%5Cpi%7D)

B that is the correct answer
Answer:

Explanation:
The <em>3N force </em>must be attributed to electrostatic attraction between both charges.
The formula is known as Coulomb's law:

Where:
is the elecrostatic force: 3 N- k is the constant for Coulomb's law ≈ 9.00 × 10⁹ N . m² / C²
- d is the distance that separate the centers of the charges
are the values of the charges: ≈ ± 1.6 × 10⁻¹⁹ C
When you are not interested in the direction of the electrostatic force you just use the magnitudes of the charges.
Substitute in the formula and solve for d:


That can be converted to angstroms with the conversion factor:
