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A hair dryer uses 2000J in 5 seconds when on full power. The power used is?

we are told that E = 2000J and t = 5s we need to find P recall which formula used energy, time and power P = E/t sub in values P = 2000/5 = 400 W (DONT FORGET UNITS)
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Answered by Tom F. • Physics tutor
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Work out the value of 4a + 2b when a = 4 and b = 3.

first substitute all the values you know into the formula (use brackets to make your work clear) 4(4) + 2(3) we know that 2 numbers next to eachother means multiply so expand it 4 x (4) + 2 x (3) using BODMA...
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Answered by Tom F. • Maths tutor
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Why is the Haber Process run at 450 °C instead of room temperature?

the forward reaction of the harbour process is exothermic, it gives out heat. so increasing temperature will shift the equilibrium and decrease the yeild, however increasing the temperature also increases th...
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Answered by Tom F. • Chemistry tutor
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What is empirical formula and how is it worked out?

Empirical formula is the simplest ratio of elements in a formula. chemists use it to make big molecules easier to work with when doing calculations. An example of a working out an empirical formula is; Q) He...
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Answered by Tom F. • Chemistry tutor
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What is the significance of Eva Smith's name in 'An Inspector Calls'?

As is often the case in tackling English questions, there is no right or wrong answer, the key is in choosing a few strong ideas which you can support with evidence from the text and which you can communicat...
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