Question

temperature of changing solid iron into liquid​

Answer 1

Answer:

Given:-

Initial velocity ,u = 0m/s

Acceleration ,a = 2m/s²

Time taken ,t = 20 s

To Find :-

Final velocity ,v

Solution:-

⠀⠀⠀⠀⠀⠀⠀⠀⠀According to the Question

It is given that the particles start from rest & accelerate at 2m/s² . We have to calculate the final velocity of particles after 20s . Using 1st equation of motion

v = u + at

where,

v denote final velocity

u denote initial velocity

a denote acceleration

t denote time taken

Substitute the value we get

:\implies:⟹ v = 0 + 2×20

:\implies:⟹ v = 0 + 40

:\implies:⟹ v = 40 m/s

Hence, the final velocity of the particles is 40m/s

So ,the required option is (a) 40m/s .

Answer 2

Answer:

yes! absolutely it's true

Water is a solid (ice) below 0o C, a gas (water vapor) above 100o C. Iron becomes a liquid when we heat it to a temperature of 1535o C; this is its melting point. If we further heat the liquid to 3000o C it boils; iron is a gas above this temperature.