Advertisements
Advertisements
Question
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?
Advertisements
Solution
`W = barF.barS = Fs cos theta`
`cos theta` maximum value 1 = FS
`:. theta = 0^@`
APPEARS IN
RELATED QUESTIONS
Why is a jack screw provided with a long arm?
Differentiate between energy and power.
What do you mean by degradation of energy?
Does the earth move around the sun with a uniform velocity?
How many joules are there in 1 mega joule?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
State larger units of power.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
