Question
Materials for rain proof coats and tents owe their
water proof properties to –Solution
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
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Raj scored 140 marks in a test getting 3 marks for each right answer and losing 1 mark for each wrong answer, had 4 marks been awarded for each correct...
Find the value of 6 + 66 + 666 + 6666 +hellip;hellip;hellip;hellip;.. + n terms.
1. `(2)/(3) ((10 xx (10^(n)- 1))/9 - n)`
2.
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