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# grade11

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Explain why spokes are fitted in the cycle wheel.
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Explain why spokes are fitted in the cycle wheel.

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Why bridges are declared unsafe after a long use?
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Why bridges are declared unsafe after a long use?

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A man carrying a bucket of water on his hand always leans to the opposite side. Explain.
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A man carrying a bucket of water on his hand always leans to the opposite side. Explain.

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Why is a horse more stable than a man?
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Why is a horse more stable than a man?

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If the earth is struck by meteorites, the earth will slow down slightly. Why?
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If the earth is struck by meteorites, the earth will slow down slightly. Why?

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Suppose two forces act on rigid body and two forces have same magnitude but opposite direction. what conditions the body rotate?
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Suppose two forces act on rigid body and two forces have same magnitude but opposite direction. what conditions the body rotate?

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Why a wrench of longer arm is preferred in comparison to a wrench of short arm?
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Why a wrench of longer arm is preferred in comparison to a wrench of short arm?

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Explain which one is more elastic- rubber or steel.
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Explain which one is more elastic- rubber or steel.

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During pregnancy, woman often develop back pains from leaning backward while walking. Why do they have to walk this way?
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During pregnancy, woman often develop back pains from leaning backward while walking. Why do they have to walk this way?

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How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.
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How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.

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Explain why the moon has no atmosphere?
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Explain why the moon has no atmosphere?

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The weight of a body is less inside the earth than on the surface. Explain.
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The weight of a body is less inside the earth than on the surface. Explain.

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If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?
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If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?

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Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?
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Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?

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What will happen to the value of ‘g’ if the earth stops rotating?
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What will happen to the value of ‘g’ if the earth stops rotating?

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