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Q: If two people with different body sizes want to compare their strength levels when lifting the same object. For a fair comparison what should they measure?
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Which requires more work lifting a 25 kgbag of cement 10 meters vertically or lifting a 50 kgbag 5 meters vertically?

I think the formula is something like work (energy) is mass by height by gravity. as gravity is a constant, dont worry about it in comparison. 25*10 is 250 50*5 is 250. They require the same effort


How can you weigh things without equipment?

You can estimate the weight of things by lifting them with your hands, and you can compare it with standard weights - which weighs less - if you think that counts as "not using equipment". However, don't expect a great precision from this method.


How can you connect four dots shaped like a square without lifting the pen?

you join the dots without lifting your pen.


How can you tell if a graph is continuous?

If you can draw it without lifting your pencil


Bernoulli's equation and an airplane's wing?

Bernoulli's equations explain 100% of the lifting force created by wings. But Newton's third law also explains 100% of the lifting force. This should not be suprising, since Bernoulli's equations are based on Newton's laws. Bernoulli and Newton are two different ways of explaining a complicated situation. Neither is more "right" than the other. If we choose one explanation while ignoring the other, then our understanding of flight will be incomplete. To be clearer... Bernoulli's equation describes the lifting force in terms of pressures applied to the wing surface. There are no other forces involved. If we know the pattern of pressures, then we know the lifting force. Yet the explanation of flight remains incomplete. Wings feel pressure because they change the motion of the surrounding "parcels" of air, and air has mass. If a wing applies a force which causes air to accelerate downwards, then by Newton's 2nd and 3rd laws, the wing must experience an equal upwards lifting force. If we know the acceleration of the air surrounding the wing, then we know the lifting force.

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