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If the distance between the earth and moon were halved, the force of the attraction between them would be:
a) One fourth as great
b) One half as great
c) Twice as great
d) Four times as great
Ans:
The force of the attraction among them would be four times as great.
Which of the following particles has more electrons than neutrons: (1) C (2) F- (3)O -2 (4)Al +3 Ans: O -2
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Driving nails with the help of inertia Extend a thin board over the edge of a table and support it well by having someone stand on the part in excess of the table. Try to drive
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what happens when a melt contains 1% ag with 99%pb?
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