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JEE Main 2022 (Online) 28th July Morning Shift
Numerical
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Out of Syllabus
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The frequency of echo will be __________ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h towards a hill from which an echo is heard by the train driver. Velocity of sound in air is 330 m/s.

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2
JEE Main 2022 (Online) 28th July Morning Shift
Numerical
+4
-1
Change Language

The diameter of an air bubble which was initially $$2 \mathrm{~mm}$$, rises steadily through a solution of density $$1750 \mathrm{~kg} \mathrm{~m}^{-3}$$ at the rate of $$0.35 \,\mathrm{cms}^{-1}$$. The coefficient of viscosity of the solution is _________ poise (in nearest integer). (the density of air is negligible).

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3
JEE Main 2022 (Online) 28th July Morning Shift
Numerical
+4
-1
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A block of mass '$$\mathrm{m}$$' (as shown in figure) moving with kinetic energy E compresses a spring through a distance $$25 \mathrm{~cm}$$ when, its speed is halved. The value of spring constant of used spring will be $$\mathrm{nE} \,\,\mathrm{Nm}^{-1}$$ for $$\mathrm{n}=$$ _________.

JEE Main 2022 (Online) 28th July Morning Shift Physics - Work Power & Energy Question 35 English

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4
JEE Main 2022 (Online) 28th July Morning Shift
Numerical
+4
-1
Change Language

Four identical discs each of mass '$$\mathrm{M}$$' and diameter '$$\mathrm{a}$$' are arranged in a small plane as shown in figure. If the moment of inertia of the system about $$\mathrm{OO}^{\prime}$$ is $$\frac{x}{4} \,\mathrm{Ma}^{2}$$. Then, the value of $$x$$ will be ____________.

JEE Main 2022 (Online) 28th July Morning Shift Physics - Rotational Motion Question 39 English

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