S1: | A force of exists between everybody in the universe. |
P : | Normally it is very small but when the one of the bodies is a planet, like earth, the force is considerable. |
Q : | It has been investigated by many scientists including Galileo and Newton. |
R : | Everything on or near the surface of the earth is attracted by the mass of earth. |
S : | This gravitational force depends on the mass of the bodies involved. |
S6: | The greater the mass, the greater is the earth's force of attraction on it. We can call this force of attraction gravity. |
S1: | There is a touching story of Professor Hardy visiting Ramanujan as he lay desperately ill in hospital at Putney. |
P : | 'No Hardy, that is not a dull number in the very least. |
Q : | Hardy, who was a very shy man, could not find the words for his distress. |
R : | It was 1729. |
S : | The best he could do, as he got to the beside was "I say Ramanujan, I thought the number of taxi I came down in was a very dull number" |
S6: | It is the lowest number that can be expressed in two different ways as the sum of two cubes. |
S1: | Payment for imports and exports is made through a system called foreign exchange. |
P : | The value of the money of one country in relation to the money of other countries is agreed upon. |
Q : | These rates of exchange vary from time to time. |
R : | For instance, an American dollar or a British pound sterling is worth certain amounts in the money of other countries. |
S : | Sometimes a United States dollar is worth 12 pesos in Mexico. |
S6: | Another time it may be worth eight pesos. |
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