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quiz3

# quiz3 - 7A-2 Quiz 3 DL See(J Name CHE A m Last First E"...

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Unformatted text preview: 7A-2 Quiz 3. DL See (J Name CHE A m Last First E!" C (III) tceuseon)‘ I certify by my signature that I will abide by the code ,1 _ of academic conduct of the University of California. Signature e .. " Lu“. 0 Lew / _ 1. Identical, beau}r 25 kg crates are slid up either of two frictionless ramps, A and B, to the same vertical height offthe ground, d= 1.5 m. (a) (30%) Using the energy-interaction model you have been learning in DL, explain in words on which of the ramps (A, B, or neither) is more work required to push the crate up to the top, and why. ’- \ W "I W‘s: AREthlW MK :0 5 ”‘3 A‘i {Both (rte-\$23 have We saw masts . ‘ 'Fer Berlin {was (some; mtg eone'io‘er M efmaell ﬁhél amide) position). Were'FnrQ, Hm work “Hymnal ire push one; (ma-Q we ram? A be iaem¥tcal he We work magma-eel 1h, {ugh We oi’htr crate up: ramp 3. (b) (25%) Calculate the amount of work (in units of Joules) required to push the crate up each of the ramps. 'FrbM earl (0.3) 4M1 work is 'HAQ S we ”FM- 'bo‘l"lri Etien‘ett‘l m3 = (25 1:31 to “my 1.50“) E 37—5 “M 23:15 3" (c) (45%) Suppose the 25 kg crates are now allowed to freely slide down from rest (v; = 0 m/s) from the top of both ramps, but now there is ﬁictign The ramps are made of identical materials. Using the energy-interaction model, explain in words on which ramp (A, B, or neither) will the crate have a greater velocity by the time it reaches the a bottom, and why. Your explanation must mention the energy-system changes, and their relative magnitudes, for each case- 59E same {1" berth \$439413 . ~. K53; enemy IS iii-3+ tv’mm Al’f rl-“AKEJF AE‘W, a ) Mere. bE-Hq en (”AMP A \$‘t‘CE Al’Eaeﬂl’Eg maveﬁe we”: [5 “may” Wﬁhd MH‘ We argues; ~ - r AKE rump, mallow-3A; ’fﬁeere’Fm'e) is smaﬁef om rmmhaA Gubell ’(V‘K’. urged-ix! is swalier (K MCE -* J-mvf -—%;,,ZJ;}1) My Jthe time “the male reaches 'Hm; heiﬁ-em‘ e); r'an A'I‘Tﬁﬁ ES, ‘l‘ML trait 03‘“ have a ﬁre-ask!“ valet-Hy bx, the lane 't-l‘ 111de We ‘ipeH—wm 01E ramp 6. Use at e nations and constants: W = Fqu; AEq-H '-= CAT; APEE = mgAy; AKE = lﬂvaz); APE,” = lf2kdl?); g5 = 10 kag (=or mfsz); Units of Joule: kg(m2/sz) = Nm. ...
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