Physics
If a band is played on the moon the sound will

Not be heard at any distance at all from it
Be heard by us faintly
Be heard upto 10km from it
Reverberate

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the sand is grainy but concrete is smooth.
sand is soft and concreter is hard.
the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.

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