Physics
What is the range of masses involved in the study of Physics?

10-19 kg to 1055 kg
10-30 kg to 1030 kg
10-30 kg to 1055 kg
10-19 kg to 1038 kg

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

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

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