Answer:
When light enters from air to water i.e. it is moving from rarer to denser medium, it changes its original path as there is a change of speed of light and deflects itself towards the normal. This is known as the refraction of light and this is why a pencil in a cup of water looks as if it is broken and larger.
Explanation:
Answer: what do you mean ''beyond certain temperature'', Do you mean ask in cooling the liquid down or heating the liquid up?
Explanation:
Answer:
<u>B. Should be rested</u>
Explanation:
That is the only reasonable answer.
The sum of an object's potential and kinetic energies is called the object's mechanical energy. As an object falls its potential energy decreases, while its kinetic energy increases. The decrease in potential energy is exactly equal to the increase in kinetic energy.
Answer:
1961 kJ
Explanation:
Since the mass of each substance is 1 kg, the heat required to change a substance at is boiling point is its latent heat of vapourization, L. For a given mass, m, the quantity of heat Q = mL
For liquid water, m = 1 kg and L = 2256 kJ/kg.
So, quantity of heat required is thus Q₁ = 1 kg × 2256 kJ/kg = 2256 kJ
For liquid mercury, m = 1 kg and L = 295 kJ/kg.
So, quantity of heat required is thus Q₂ = 1 kg × 295 kJ/kg = 295 kJ
The amount their thermal energies differ is thus Q₁ - Q₂ = 2256 kJ - 295 kJ = 1961 kJ
