Wheel of an engine rotates `3000` times/minutes & produce energy of 200 Hp. Calculate the torque.

The rate of a reaction at 400 K is 10 times than the rate of the reaction at 200 K . Calculate activation energy of the reaction.

The rate of a reaction at 200 K is 10 times less than the rate of the reaction at 400 K. Calculate activation energy of the reaction.

A first order reaction takes 30 minutes for 50% completion. Calculate the time required for 90% completion of this reaction . (log2=0.3010)

The rate constant of a reaction at 200k is 0.1 times its value at TK . If the energy of activation of the reaction is 7.65"kJ.mol"^(-1) , find the value of 'T'?

The earth rotates around the sun in a circular orbit of radius R. Calculate the orbital speed of rotation of the earth around the sun. Also find the time period of rotation. Take the mass of the earth =m, mass of the sum =M.

An electric iron which has a resistance of 80 Omega is used on 200V source. Calculate the electric energy consumed in kilowatt hour if it is used for 2 hours-

An infinite line charge produces a field of 9times10^4N//C at a distance of 2 cm. Calculate the linear charge density.

For increasing temperature from 300K to 320K the rate of reaction increases by 4 times calculate energy of activation for that reaction.