Midterm2_KEY

# Midterm2_KEY - Name: KEX Midterm 2. ID: 1. With the ﬁgure...

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Unformatted text preview: Name: KEX Midterm 2. ID: 1. With the ﬁgure shown, a block with a mass of 1 kg is initially at rest, and a force, F, along the horizontal direction (towards the left) is applied on the object, (a) If the friction is neglected, how large the force, F, needs t on 0 be for the block to move upkthe slope with a constant acceleration of 1 m/s2 ? 15% (b) If the coefﬁcient of static friction, p3, between the block and the slope is 9! object to move upnthe slope 10% 0.8, how large does F needs to be for the Drawing {heﬁee-body diagrams Would be great in both cases. Along x direction ‘Fx T Ffrx 5“ “M F»: :9” ‘Hmcl Fmso‘? = mg SI‘nBohmq §inhénw 1,: :_ 6‘8W Along Y]: F; 7'ng : F5134; 00+ "153061300 = aLFr‘lixiw: 39/991; @ F 30° (4(0H X: {6:- the Oil/bat to WWI/2 FK ‘725 '" FGx a0 F505§o°-/M5n— mg amigo E]; '. . J J) 1F 0'9(LF+EI)“%J>X2/D re 3%» OI‘lFeétS/r M >0 ~1‘> 0MP ZHJ 3) F ZZWN. 2. The 1kg block, which sits on top of the 2kg block, is tied to the wall with a rope. The 2kg block is pulled to the right by a force F and is moving with a constant acceleration of lm/sz. The coefﬁcient of kinetic friction at the upper and lower surfaces of the 2kg block is 0.2. What is F? 25% ‘For tag llcai bier/k. “1 12%;: K' % W11 “113/1711? jQiC13/f/{k n.: M: m} : (my W58: (xiii/V 79k], : Mg n1) n1: mlgfn‘ﬁ/ndmaﬂr Milli: ZWWV 2} 7%“: mix 2M : 588 N. i?” iicl’lpicp: MM f : llieirliitlyl :ﬁrtw. 2 3. A 1 kg ball is attached to a rope as shown in the ﬁgure. The ball is moving in a horizontal circle of radius of 1 m with a constant Speed of 2m /s. Determine the angle 6 between the rope and the vertical direction. 25% Er 171M? qui/i ' 4. Three balls are traveling on a surface as shown in the ﬁgure. With the impulse approximation (ignoring any other forces except the interactions between balls), determine the magnitude of the velocity of ball C after the collision. 25% Contemth of wwmammm E— M 394%“: WkSikm/t; 7% “Pm: 1)!) —— lXﬁWéﬁiﬁoo “g £51“ 1 2*- UM‘I'E": -l\%§l’ 2kg Before collision PM? 1 211* l >1th Sin/130° :q“(-l\(;[: 2 1111/5 ©V? o. “33" Alt” 6050530913 1"} 2k 1 s PX,]CZ ‘23” l leeJJC 3‘2 'l' l X VGX : PXJZ‘ Aﬁercollision I :3 V511: 0x5?!) “4/5 PL} 2 “lxl TL “V6,; 1 l’m‘:2 I) V5,}I1uhq/s :) Va: Wag—+1411, : o‘ottm/S 7 ...
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## This note was uploaded on 05/12/2010 for the course PHYSICS 20 taught by Professor Yigu during the Spring '10 term at Washington State University .

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Midterm2_KEY - Name: KEX Midterm 2. ID: 1. With the ﬁgure...

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