A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force. (a) Write the expression for the work done by the force. (b) what should be the angle between the force and displacement to get the (i) zero work (ii) maximum work?
Name the physical quantity which is measured in calorie. How is it related to the S.I. unit of the quality?
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.