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2010 midterm solutions

# 2010 midterm solutions - golu‘h‘dﬂf‘ 20 go F.5...

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Unformatted text preview: golu‘h‘dﬂf‘) 20 go F... .5. _ WIMWW I Mtol «Wm M...“ MElZSBP Wednesday, April 28,‘ 2010 Midterm, Closed Book and Notes Problem 1. The vehicle below has its CG centered between the wheels at a height h as shown. a) If the weight of the vehicle is W, what are the weights Wf, and‘Wb on the front and rear axles respectively. \$7/mvln—LW.) W1; awr: % b) The vehicle accelerates with acceleration ax. What is the weight on the rear axle (Show your work). C l 0 Ce, M; 32 p (a ‘ . *lmxr ﬂeece elem}? WW”? WW:— 4» Wevrﬁc'ﬁ “"7” 2. K m .r whee MW “2* ML ' We“ Car Problem 2. A vehicle has the following properties: Nf “4—” 3 (ﬁnal differential gear ratio) Nt = 2 (transmission gear ratio) I5 3 1 kg~1n2 (engine rotational inertia) Id = 0.1 kg—m2 (drive-shaft rotational inertia) r u 0.1 m (Wheel radius) What do the engine and drive—shaft contribute to the equivalent mass, Mr. "L 1 Mr: (New) It, "‘r J39 Ice. \(2' V1, ; Heel 4— fl. '* £01 ‘0: SE s W {3‘ “o i) Problem 3. The traction force versus velocity is shown for a vehicle in 4th gear. a) If the 4th gear ratio is I and the 2ad gear ratio is 2. Sketch the traction force purve for 211d . ‘ gear End- ‘JYIAJ 1 ~Mﬁm€w haw “1x194 h a! M 2% K to aw; k 27M)"j l .3: ““““ “WM” “MK. *" A... k Wk- bkyﬁ k ‘< H?“ ‘ K .\\ \V -m.” _.‘.u.....‘-. in, m ....,..«:‘i§, go (go 3 0 M/m C J? n \ aw 9: Rugs»- Wﬁ x a r \L» x M M 4,; N TY M [\{C \ KW“) -~ 1Q ( MAW Mr Jud/W f C“: J/ 6 /// / ‘1 ﬂ 5} wt" 60 j f: QM W (/0va (’3 Co \ 0%) 0* \,/“~C““ a W) Problem 4. List as many contributors that you know of to rolling resistance. At high speed, rolling resistance can increase dramatically —~ expiain. “""HV‘Q (Rd hem {WN— “iﬂﬁ Vﬁjmﬂ! I hy‘yH’WeSls M deCq/msmgy Maggi/3 Tex deﬁwmmg ﬁtdewaEB We COW%’€)~.C§€" w h wise-ewe si 5 i \ b i H ‘ {k' s A” _ “N §C_.Y VAC} CH W133 wkﬂ; l u M ..... ‘S’ToLq‘éBUP ‘ _ i “new “h‘rﬁ £3 {V}; x; mm <2: g’ﬁJmW/XM : m; _E ﬂ-ﬁ. «ﬂew Q 3 f’" V - ,. m p. M. m W ‘ U .4“;me I u ‘ r a heme-n. WA; & m BﬁWOQb/Xﬁ) {ADKSLVQQJ \V\. mm Ema“ f N. iwknrg, I Woodbecﬂ GQ‘PLGC‘ATCV‘ (6‘5. ﬁend.) ﬂ Problem 5. Soap box derby cars employ the foliowing type of lever brake. A) For the torque and other parameters shown, what is the drag force? b) If one compares this to a shoe in a drum brake. Is it more like a leading or lagging shoe? \ ‘ ...
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2010 midterm solutions - golu‘h‘dﬂf‘ 20 go F.5...

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