Answer:
4.5
Explanation:
volume is length x breath x height
since 75 is in cm, we convert it to metre
= 0.75m
= 1.2m x 5m x 0.75m
=

Answer:
The minimum launch speed is 13366.40 m/s.
Explanation:
Given that,
Mass of planet 
Radius 
Height = 6R
We need to calculate the speed
Using relation between gravitational force and total energy




Put the value into the formula


Hence, The minimum launch speed is 13366.40 m/s.
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.
The Answer is true, the saying opposites attract are true for magnets when poles match though they repel.
Answer:
Explanation:
Given
mass of object is m
Mass of planet is M
radius of planet is R
Total Energy associated with mass m at a height h above planet is Gravitational Potential Energy which is given by

When it falls on earth with some velocity v
=Kinetic Energy+Potential Energy

As Energy is conserved therefore



