You lift a heavy book from the floor of the r | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The work done $(W)$ by an external force in lifting an object against gravity is given by the formula: $W = mgh$.Here,$m$ is the mass of the objec

Vedclass · Accepted Answer

Weight of the book and height of the bookshelf

Vedclass · Answer

(B) The work done $(W)$ by an external force in lifting an object against gravity is given by the formula: $W = mgh$.Here,$m$ is the mass of the object,$g$ is the acceleration due to gravity,and $h$ is the vertical displacement (height).Since the weight of the book is $W_b = mg$,the work done can be expressed as $W = W_b 	imes h$.Therefore,the work done depends only on the weight of the book and the height of the bookshelf.It does not depend on the time taken to perform the work,as time is a factor in calculating power,not work.

You lift a heavy book from the floor of the room and keep it in the bookshelf having a height of $2 \, m$. In this process,you take $5 \, s$. The work done by you will depend upon:

Similar Questions

When a force of $50 \, N$ is applied to an object,it undergoes a displacement of $10 \, m$ at an angle of $60^\circ$ with the direction of the force. The work done is ......... $J$.

If force and displacement of a particle in the direction of force are doubled,the work done would be:

$A$ heavy box of $40\, kg$ is pushed along $20\, m$ by two coolies over a railway platform whose coefficient of friction with the box is $0.4$. The work done by the two coolies is: .................. $J$ (Take $g = 10\, m/s^2$)

$A$ body of mass $3\, kg$ is under a constant force which causes a displacement $s$ in metres in it,given by the relation $s = \frac{1}{3}t^2$,where $t$ is in seconds. Work done by the force in $2$ seconds is

$A$ chain of mass $4 \ kg$ and length $2 \ m$ is hanging such that one-fourth of its length is hanging over the edge of a table. The work done to pull the hanging part onto the table is . . . . . . $J$. (Take $g = 10 \ m/s^2$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module