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A given object taken double time to slide down a `45^(@)` rough incline as it takes to slide down a perfectly smooth `45^(@)` incline. The coefficient of kinetic friction between the object and the incline is given byA. `(1)/(4)`B. `(1)/(2)`C. `(3)/(4)`D. `(1)/(sqrt2)` |
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Answer» Correct Answer - C `sqrt((2s)/(g sin 45^(@) - mu g cos 45^(@))) = 2 xx sqrt((2s)/(g sin 45^(@)))` `(1)/(((1)/(sqrt2) - (mu)/(sqrt2))) = (4)/(((1)/(sqrt2)))` `1 = 4 (1 - mu)` `mu = (3)/(4)` |
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