1

JEE Main 2020 (Online) 5th September Morning Slot

Numerical

+4

-0

A force $$\overrightarrow F = \left( {\widehat i + 2\widehat j + 3\widehat k} \right)$$ N acts at a point

$$\left( {4\widehat i + 3\widehat j - \widehat k} \right)$$ m. Then the magnitude of torque

about the point $$\left( {\widehat i + 2\widehat j + \widehat k} \right)$$ m will be $$\sqrt x $$ N m.

The value of x is _______.

$$\left( {4\widehat i + 3\widehat j - \widehat k} \right)$$ m. Then the magnitude of torque

about the point $$\left( {\widehat i + 2\widehat j + \widehat k} \right)$$ m will be $$\sqrt x $$ N m.

The value of x is _______.

Your input ____

2

JEE Main 2020 (Online) 4th September Morning Slot

Numerical

+4

-0

A circular disc of mass M and radius R is rotating about its axis with angular speed $${\omega _1}$$
. If another
stationary disc having radius $${R \over 2}$$ and same mass M is droped co-axially on to the rotating disc.
Gradually both discs attain constant angular speed $${\omega _2}$$
the energy lost in the process is p% of the
initial energy. Value of p is __________.

Your input ____

3

JEE Main 2020 (Online) 3rd September Evening Slot

Numerical

+4

-0

An massless equilateral triangle EFG of side ‘a’ (As shown in figure) has three particles of mass m
situated at its vertices. The moment of inertia of the system about the line EX perpendicular to EG
in the plane of EFG is $${N \over {20}}$$ ma

^{2}where N is an integer. The value of N is _____.Your input ____

4

JEE Main 2020 (Online) 3rd September Morning Slot

Numerical

+4

-0

A person of 80 kg mass is standing on the rim
of a circular platform of mass 200 kg rotating
about its axis at 5 revolutions per minute (rpm).
The person now starts moving towards the
centre of the platform. What will be the
rotational speed (in rpm) of the platform when
the person reaches its centre _________.

Your input ____

Questions Asked from Rotational Motion (Numerical)

Number in Brackets after Paper Indicates
No. of Questions

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