Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are unaffected by atmospheric disturbances.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.
Short waves are more energetic than long waves.

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and remain floating
Burst after reaching some height
Reach a particular height and start coming down

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

coal tar is a liquid and it flows in the barrel when it is rolled
more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled

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