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A boy of mass m is sliding down a vertical pole by pressing it with a horizontal force f. If is the coefficient of friction between his palms and the pole, the acceleration with which he slides down will be

Chemistry

A very small amount of a nonvolatile solute (that does not dissociate), is dissolved in 56.8 cm³ of benzene (density 0.889 g cm^-3). At room temperature, vapour pressure of this solution is 98.88 mmHg, while that of benzene is 100mmHg. Find the molality of this solution, if the freezing temperature of this solution is 0.73 degree Celsius lower than that of benzene. What is the value of molal freezing point depression constant of benzene?

Mathematics

A key bunch contains m keys exactly one of which opens the door. A man tries to open the door by choosing a key at random discarding the wrong key after each trial. The probability that the door opens at the r^th trail , is

(a) 1 / m (b) 1 / r (c) r / m (d) (r-1) / m

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