Why Is It Harder to Walk Uphill than Downhill?
Why Is It Harder to Walk Uphill than Downhill? It is harder to walk uphill than downhill because you must lift the weight of your body and to do this requires greater...
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When Will a Car Engine Stall?
When Will a Car Engine Stall? A car engine will stall—that is to say, it will suddenly stop when you do not want it to—if it is unable to provide sufficient power to...
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Why Do Some Cars Need Aerofoils?
Why Do Some Cars Need Aerofoils? Racing cars capable of moving at speeds well in excess of 100 mph need aerofoil’s to counter the effect of lift created by their highly...
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Who Invented the Rocket?
Who Invented the Rocket? The rocket, as far as can be established, was invented by the Chinese during the 12th or 13th Century. The Chinese used their rockets as...
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Why Do Oil and Water Not Mix?
Why Do Oil and Water Not Mix? Oil and water do not mix because the molecules (tiny particles) of which they are composed are so different. The molecules in oil are much...
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