ROTATIONAL MECHANICS......

BITSAT 2015 Coaching › Mechanics questions › ROTATIONAL MECHANICS......

A SOLID BODY STARTS ROTATING ABOUT A STATIONARY AXIS WITH AN ANGULAR ACC. 2*10^-2T HERE,T ISD IN SECONDS.HOW SOON AFTER BEGINNING OF ROTATION WILL TOTAL ACC. VECTOR MAKE AN ANGLE OF 60Â° WITH VELOCIRTYT VECTOR?

PLZ SOLVE COMPLETELY AS I HAVE DOUBT IN STEPS! :)

#Physics #Mechanics

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6 Answers

pranav ·2010-02-07 20:57:19

a=2*10^-2T

as w = w₀+at

and w²= w₀+2aâˆ‚

where âˆ‚ is angular didplacement (theta)

so w²=2aâˆ‚ as w₀=0.......(1)

and w= 0 + at.....(2)

putting value of (2) in (1)

a²t² = 2aâˆ‚

solving u get

y³=2âˆ‚/a

solve to get answer is mostly 7.something =7appx

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pranav ·2010-02-07 20:58:58

hey bond tell whetehr its correct...?

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pranav ·2010-02-07 21:19:09

????

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hacker ·2010-02-07 21:57:04

YES ITS 7

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hacker ·2010-02-08 00:20:27

but i din get the solution!

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pranav ·2010-02-08 00:26:55

yaar poora likh diya fir bol rahe ho nahi mila.......use the 2 formulas of rotation in cont accn!

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ROTATIONAL MECHANICS......

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