Midterm3_KEY

# Midterm3_KEY - Kp é”[Ml-MW Name ID 1 A 10kg block on a...

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Unformatted text preview: Kp/ é” [Ml-MW Name: ID: 1. A 10kg block on a frictionless horizontal surface is attached to a spring with k=10N/m, as shown in the ﬁgure. The other end of the spring is attached to the wall. The spring is neither compressed nor stretched initially. A 2kg block is moving with a constant velocity of 6m/s towards the 10kg block. Assuming the collision is perfectly elastic, what is the maximum compression of the spring? 25% T7(ool<l is at rest M‘t‘a/u/ ”For pafa’cl/ eta/ﬁfth catfish?“ k=10Nl V '— Zm’ VI ‘ m I’f- 1411'th ’1’ 2 :31: 16:?”34/5 1 {0+1/ vhf n m vetoci‘h/ 93‘ black 7, rljrtt offer We 0056;;in For M001: 2 , 5mm, Ts WWI/ed after ”W412 “WW/WI. K? i— U‘wa‘ : kf‘f USFJC ﬁxmvbflioz OtﬁlcoXV 1:} rioxlﬁ lire/0K0?" 3) 657(1))ﬂ/1 2. A block is sliding down along a vertical wall. The kinetic friction coefﬁcient between the block and the wall is 0.1. (a) Determine the work done by the forces F1, F2, F3, F3, and fk (kinetic friction force; not shown in the ﬁgure) when the object slides down 2 m along the wall. 15% (b) Determine the change in the kinetic and potential energies of the block when it slides down 2 m. 6% (c) Is the mechanical energy conserved in this process? If not, how much does it change? 4% (a) Wz‘f-‘ﬁ : FPMQ WE : F. may: F, mas/90°: ~Flr‘ :—f¥L= 40] We: Rm 0939 :lOVHWét’D': WWI: '01 WP; *1 it; Fwd/700: 0 Wm ; mgrmo" :LMo‘WL: We] Micz/Mkmcﬁslgvoxr : —2//lrh 71: RTE/005530: Wi/ov‘g = 20556” a) Mile: -Ly {M x M166 33—1752] (lo) 0 {:2 Wd Who 3 WEiWFtt W57 W;Q tMtz—(oﬂoﬂéﬂrlﬁwv =’ M? I . , Du: -W¢: -' Wm: '3‘K2] 3507 .Thz WEGth‘mL wag/t3, LS mt marl/u? 3. A spring, which is compressed 2m with k=5N/m, is used to launch a 1 kg block across the horizontal surface. The block is not ﬁxed to the spring. The kinetic friction coefﬁcient between the block and the horizontal surface is 0.2. The block is initially at rest. How far can the block move from the launch point? 25% éEYheci‘ :— Emecuoc - Ewan”: : Wm: (Wm-l: 099w. by, Jar/L2 k=SN/m 7W?!" 6941.5er'wtf,‘ve ‘FDYLQ‘J w.- BWWLf-«O. :9 Who- O'{U:"/0j Heme} WM 73 the WI: dam 177 ’5’”? £76175?! fierce. TIE; Wm * 72km" “5/300 Zrﬁcor -> 75K 2/4“” ﬂing}: manning/v V Writ :' ”ligél‘: “[0] Z.) r: f'lm 4. The total torque experienced by an object with the moment of inertia of 5 kgn'i2 is shown in the ﬁgure. The object has an initial (t = Os) angular velocity of 10 rad/s. What is the object’s angular velocity at t = 2s, 6s, and 83? 25% “(=1&2 1% TM) :7 law): ”3091‘: 2 rajlcﬂwz Etch? ﬂan Ts m area {MM ”(mt curve t _. . 62s) _ A r zs‘jw Idlw: all/ms At t_ 6;, WW) :7 [WCw- wloﬂ ”EHLVMS [vi/(65)— Moﬂvy; mum: ., 0 no? :) WCZS): q‘émcpzc Alf f :1wa: l :3'1’ 4 r we»? mom”: 6%: :3 MM): H17, rad/5 ...
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