Physics
A vacuum cleaner works on the principle of pressure difference. On the moon it will

Not work at all
Work as efficiently as on the earth
Work with reduced efficiency
Work with increased efficiency

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The initial momentum of the rubber ball is greater than that of the metal ball
The metal ball suffers greater change in momentum
The rubber ball suffers greater change in momentum
Both suffer the same change in momentum

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