Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
Given, mass m = 400 kg, height = 20 m, g = 10ms-2
P.E = mgh = (400) (10) (20) = 80000 J
APPEARS IN
संबंधित प्रश्न
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 of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
State the energy changes which take place when A toy car with a wound spring moves on ground.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.
A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
