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Science
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A low frequency amplifier has a power gain of 50 dB. The input of the amplifier is 800 ohms resistive. The output is arranged for a 8 ohm loudspeaker. What will be the rms current in the speaker if a...
Liam is trying to remember a 3-digit code. He knows the rule that, the first digit is a cube number. The second digit is a factor of 16. The third digit is an odd number. Liam tries a random code that...
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You must show your working. Only ruler and pair of compasses allowed. The link below shows the layout of a department office 20 metres by 12 metres. A photocopier is to be installed under certain...
A large boat anchored in a port has a ladder which hangs over the side. The length of the ladder is 200cm, the distance between each rung is 20cm and the bottom rung touches the water. The tide rises...
The link below shows a recreation area open to the general public. A park bench is to be installed under the following constraints: i. The bench is to be equidistant from point B and from point D ii....
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....πR² is the area of a circle. There are many, some more elegant than others. I recently learnt a new one that is probably old hat to the mathematicians on here but I loved its elegance. I'll say...
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A man buys a horse for £70. He then sells the horse for £80. He then buys back the horse for £90. Once again he sells the horse for £100. How much did the man make or lose? Or did he break even?...
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There are some people on a train. 22 people get off the train at the first stop and 17 people get on the train. Now there are 59 people on the train. How many people were on the train to begin with??
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The straight line L has equation 3x + 2y = 18 The point A has coordinates (0, 3) The straight line M is perpendicular to to L and passes through point A. Line L crosses the y-axist at the point B Line...
A straight line graph goes through points (a,b) and (c,d) where
a+3=c and b+6=d
Find the gradient of the line....
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How does the structure of a molecule affect its properties and behavior in chemical reactions?
