The rotational K.E. is given by `frac(1)(2) I omega^2`. Use this equation to obtain dimension of I.

Show that work done by a stretching force in producing an extension in the wire is given by W=frac(1)(2)xx stretching force xx extension .

Evaluate: (frac(1)(2))^-5

Magnitude of force F experienced by a certain object moving with speed v is given by F = Kv^2 where K is a constant. Find the dimensions of K.

Establish the relation S = ut + frac(1)(2) at^2 , using calculus.

Prove that KE = frac(3)(2) KT

Solve: frac(x)(2) -frac(1-2x)(3) =2

Solve : frac(3x)(3x + 2) = frac(1)(2)

Write the dimension of frac(a)(b) from the following relation. F = asqrtx +m bt^2

In a primary school parents asked about of the number of hours they spend per day in helping their children to do home work. There were 90 parents who helped for frac(1)(2) hour to 1frac(1)(2) hours. The distribution of parents according to the time for which, they said they helped is given in the adjoining figure, 20% helped for the than 1frac(1)(2) hours per day, 30% helped for frac(1)(2) hour to 1 hours, 50% did not help at all. Using this, answer the following : How many said that they helped more than 1frac(1)(2) hours?