HW_Ch10_Sol

# HW_Ch10_Sol - PHY126 HW Set 1 (Chap.10) Problem 10.46...

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PHY126 HW Set 1 (Chap.10) Problem 10.46 Description: You rev your car's engine and watch the tachometer climb steadily from 1200 rpm to 5500 rpm in 27 s. (a) What is the angular acceleration of the engine? (b) What is the tangential acceleration of a point on the edge of the engine's 3.5cm-diameter. .. You rev your car's engine and watch the tachometer climb steadily from 1200 to 5500 in 2.7 . Solution (a) (b) Eq.10.4.) (see constant be to assumed is on accelerati angular if , s 167 rpm/s 1590 s rpm/27 ) 1200 5500 ( / -1 α ω = = = = = t av Eq.10.5.) (see m/s 2.92 cm/2) 5 . 3 )( s 167 ( 2 -2 = = = r a t (c) Eq.10.6.) (see rev 151 min ) rmp(2.7/60 ) 5500 1200 )( 2 / 1 ( ) )( 2 / 1 ( 0 = + = + = t f θ Problem 10.49 Description: A pulley 12 cm in diameter R is free to rotate about a horizontal axle. A 220-g mass (m 2 ) and a 470-g mass (m 1 ) are tied to either end of a massless string, and the string is hung over the pulley. If the string does not slip, what torque must be applied to keep the pulley from rotating?

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## This note was uploaded on 05/28/2011 for the course PHY 126 taught by Professor Staff during the Summer '08 term at SUNY Stony Brook.

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HW_Ch10_Sol - PHY126 HW Set 1 (Chap.10) Problem 10.46...

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