colostrum
发表于 2025-3-25 06:19:29
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天然热喷泉
发表于 2025-3-25 09:08:43
Vectorsould be quite right. But does a force of 3N added to a force of 5N always produce a force of 8N? What would be the result if they pulled on a body in opposite directions? Two forces, one of 5N one way and the other of 3N the other way are equivalent to one single force of 2N in the first direction.
Cosmopolitan
发表于 2025-3-25 12:22:15
Work, Energy and Power loads by burning oil or petrol. People can do similar jobs, for example lifting cases into the boot of a car. In order to do this, they must take in energy by eating food. If we were unable to get this ‘food energy’, or . as scientists call it, we could not work and we would grow weaker and weaker.
争吵加
发表于 2025-3-25 19:13:13
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宽度
发表于 2025-3-25 23:50:22
Expansionhe straw rotates. Now a small rotation of the needle results in a much larger movement of the end of the straw. If the length of the rod increases by an amount equal to the circumference of the needle, the straw will make one complete rotation. Solids expand very little on heating compared with liqu
确定方向
发表于 2025-3-26 02:05:26
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失望昨天
发表于 2025-3-26 05:43:50
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开花期女
发表于 2025-3-26 10:47:21
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Stricture
发表于 2025-3-26 16:35:07
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Apogee
发表于 2025-3-26 19:16:18
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