Answer: O furo diminui enquanto a chapa aumenta a sua dimensão.
(The diameter decreases and the dimensions of the metal increases)
Explanation:
I will answer in English:
Here we have a piece of metal with a small hole on it, that is heated in a hoven.
We know that when a piece of metal is heated, it will expand (the density decreases, so the dimensions of the piece of metal increase).
Now, particularly, the hole will also expand but inwards, as each "extreme" of the piece of metal, will expand into where it has less resistance, so it will expand in the region where there is no material. This "inwards" expansion is why the diameter of the hole will decrease.
Answer:
drag
Explanation:
drag is the force that acts against any moving object.
if it takes him any amount of time to get from one speed to another, it is caused by drag.
Answer:
500 joule
Explanation:
given,
mass(m)= 5kg
height(h)= 10m
acceleration due to gravity(g)= 10m/s^2
potential energy =?
We know that,
potential energy = mgh
= 5×10×10
= 500 joule
B!
This is because gravitational pull energy needs a height. The higher the height the higher the energy.
