The amount of work done by the hairdryer is equal to 450 Kilojoules.
<u>Given the following data:</u>
To determine the amount of work done by the hairdryer:
Mathematically, the work done by an object with respect to power and time is given by the formula:

Substituting the given parameters into the formula, we have;

Work done = 450,000 Joules
<u>Note:</u> 1000 Joules = 1 Kilojoules.
Work done = 450 Kilojoules.
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A judgement or an observation?
Answer:
Angle of light at which it will travel in the quartz is given as

Explanation:
As we know that the refractive index of a medium is the ratio of speed of light in air and speed of light in the medium
So we will have

here we have


now by Snell's law we have



Answer:
the statement given is False.
Explanation:
The pressure is defined by
P = F / A
The force of the air is its weight,
P = W_air / A
The weight of an air column on us depends on the energy of the molecules that is related to the temperature
E = 3/2 K T
When the air is warmer it has more energy so the molecules can move more distance and therefore the average density of the gas decreases, as the density decreases, the weight of the column on us also decreases, therefore the pressure low.
The correct statement is: When the air is hotter it has less pressure than when the air is cold.
It is summary the statement given is False