I think the correct answer from the choices listed above is the last option. When electrical energy is converted into thermal energy, the <span>total amount of thermal energy plus electrical energy doesn't change. This is base on the Law of Conservation of energy where energy cannot be created or destroyed. </span>
The right answer is b) copper
It depends on the type of question, mechanical condition and given values,
You can use the formula,
Coefficient of static friction = Force of Static friction / Normal force (perpendicular to contacting surfaces)
Hope this helps!
Answer:
solids are strong and compact, they are not compressable.
liquids are flexible and less compacts they can not be coompresed