Answer:
Explanation:
The formula for the potential energy is given by
U = q x ΔV
where, U is the potential energy , q is the charge and ΔV is the potential difference.
So, the potential energy depends on the charge an the potential difference.
Answer:
<em>The tension force of the cable is 588 N</em>
Explanation:
<u>Net Force</u>
The Second Newton's law establishes that the acceleration an object has depends on the net force through the equation:
F = m.a
If the net force is zero, then the acceleration is zero, and the object's velocity remains constant.
The crane lifts a 60 Kg load at a constant velocity. It means the net force acting on the load is zero.
There are two forces acting on the load: The weight of the load and the tension of the cable that holds it.
Since the net force is zero, both forces have the same magnitude:
![T = m.g = 60\ kg\cdot 9.8\ m/s^2](https://tex.z-dn.net/?f=T%20%3D%20m.g%20%3D%2060%5C%20kg%5Ccdot%209.8%5C%20m%2Fs%5E2)
T=588 N
The tension force of the cable is 588 N
The formula for kinetic energy is,
where m is mass and v is velocity.
Let's plug the given values in the formula.
![{ E }_{ k }=\frac { 1 }{ 2 } \cdot m\cdot { v }^{ 2 }\\ \\ { E }_{ k }=\frac { 1 }{ 2 } \cdot 8\cdot { 4 }^{ 2 }\\ \\ { E }_{ k }=\frac { 1 }{ 2 } \cdot 8\cdot 16\\ \\ { E }_{ k }=4\cdot 16\\ \\ { E }_{ k }=64\quad \\ \\](https://tex.z-dn.net/?f=%7B%20E%20%7D_%7B%20k%20%7D%3D%5Cfrac%20%7B%201%20%7D%7B%202%20%7D%20%5Ccdot%20m%5Ccdot%20%7B%20v%20%7D%5E%7B%202%20%7D%5C%5C%20%5C%5C%20%7B%20E%20%7D_%7B%20k%20%7D%3D%5Cfrac%20%7B%201%20%7D%7B%202%20%7D%20%5Ccdot%208%5Ccdot%20%7B%204%20%7D%5E%7B%202%20%7D%5C%5C%20%5C%5C%20%7B%20E%20%7D_%7B%20k%20%7D%3D%5Cfrac%20%7B%201%20%7D%7B%202%20%7D%20%5Ccdot%208%5Ccdot%2016%5C%5C%20%5C%5C%20%7B%20E%20%7D_%7B%20k%20%7D%3D4%5Ccdot%2016%5C%5C%20%5C%5C%20%7B%20E%20%7D_%7B%20k%20%7D%3D64%5Cquad%20%5C%5C%20%5C%5C%20)
It's kinetic energy is 64 Joules.