A block of mass m is kept in an elevator whic | vedclass

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

Question

(C) The observer $B$ is on the ground (inertial frame). For observer $B$,the block starts from rest and moves downward with an acceleration $a$. The d

Vedclass · Accepted Answer

$\frac{1}{2}mgat_0^2$

Vedclass · Answer

(C) The observer $B$ is on the ground (inertial frame). For observer $B$,the block starts from rest and moves downward with an acceleration $a$. The displacement $s$ of the block in time $t_0$ is given by the equation of motion: $s = ut + \frac{1}{2}at^2$. Since initial velocity $u = 0$,the displacement is $s = \frac{1}{2}at_0^2$ (downward). The force of gravity acting on the block is $F_g = mg$ (downward). Since both the force and the displacement are in the downward direction,the work done by gravity is positive. Work done $W = F_g \cdot s = (mg) \cdot (\frac{1}{2}at_0^2) = \frac{1}{2}mgat_0^2$.

$A$ block of mass $m$ is kept in an elevator which starts moving downward with an acceleration $a$ as shown in the figure. The block is observed by two observers $A$ and $B$ for a time interval $t_0$. The observer $B$ (who is on the ground) finds that the work done by gravity on the block is:

Similar Questions

$A$ force $\overrightarrow{F} = 6\hat{i} + 2\hat{j} - 3\hat{k}$ acts on a particle and produces a displacement of $\overrightarrow{s} = 2\hat{i} - 3\hat{j} + x\hat{k}$. If the work done is zero,the value of $x$ is

$A$ block of mass $m$,kept on a horizontal surface,is moved through a distance $s$ by applying a horizontal force $F$ to it. What is the work done by the normal reaction?

$A$ chain of mass $M$ and length $L$ is hanging from the edge of a table such that one-third of its length is hanging off the edge. The work done to pull the hanging part onto the table is:

$A$ force $\vec F = (5\hat i + 3\hat j) \ N$ is applied to a particle,which displaces it from its original position to the point $\vec s = (2\hat i - 1\hat j) \ m$. The work done on the particle is ......... $J$.

If a person is pushing a box inside a moving train,the work done in the frame of the earth will be: (where $\vec{s}$ is the displacement of the box in the train and $\vec{s}_0$ is the displacement of the train relative to the ground)

Vedclass Test Series

Exam Paper Generator

Online Exam Module