JEE Main 2022 (Online) 24th June Evening Shift | Circular Motion Question 37 | Physics

A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be :

7.5 rad

15 rad

20 rad

30 rad

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

A boy ties a stone of mass 100 g to the end of a 2 m long string and whirls it around in a horizontal plane. The string can withstand the maximum tension of 80 N. If the maximum speed with which the stone can revolve is $${K \over \pi }$$ rev./min. The value of K is :

(Assume the string is massless and unstretchable)

400

300

600

800

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

A huge circular arc of length 4.4 ly subtends an angle '4s' at the centre of the circle. How long it would take for a body to complete 4 revolution if its speed is 8 AU per second?

Given : 1 ly = 9.46 $$\times$$ 10¹⁵ m

1 AU = 1.5 $$\times$$ 10¹¹ m

4.1 $$\times$$ 10⁸ s

4.5 $$\times$$ 10¹⁰ s

3.5 $$\times$$ 10⁶ s

7.2 $$\times$$ 10⁸ s

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

A particle of mass m is suspended from a ceiling through a string of length L. The particle moves in a horizontal circle of radius r such that $$r = {L \over {\sqrt 2 }}$$. The speed of particle will be :

$${\sqrt {rg} }$$

$${\sqrt {2rg} }$$

$${2\sqrt {rg} }$$

$${\sqrt {{{rg} \over 2}} }$$

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