Quiz3_Solution

# Quiz3_Solution - Quiz 3 Monday February 11m 2008 PHY 252 So...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Quiz 3. Monday, February 11m, 2008 PHY 252 So 1. U'TIOIU Name: 1. Identical-size lead and aluminum cubes are suspended at different depths by two thin wires in a large container of water. a. Which cube experiences a greater buoyant force? (1 point) The. buodan‘t force depevals. on like Volume o-S- displaced waiter, Lolath is the same for both. Cubes, The. buogaut jar-:95. are l‘deu‘bl'c.¢(, . 7“ = b. For which cube is the tension in the wire greater? “Tension == wequa't of; Mass -— lanai-14nd: force "The heavier Mass] lead.) glues the greater tens/om it" since the ioWan't'fOr‘Ceé are £119 same 0. Which cube experiences a greater force on its lower face? (1 point) *4 The. lower cube has the greafef-force. Fate " PXA = (P.+ng)ﬁ. The. M Chaise L04 iLe .Lo-ﬁei-L. h— 63515th d. For which cube is the ifference in pressure between the upper and lower faces greater? PW :- pﬂ ALL wt.“ Ar = %@4ﬁlaaq(lpoint) beanie-m, war MJ. ,(ecoer Surf-:1 ofwcdg Sum-(.2 :Hq, auLeAMtLaSWJ LotLasm, F0 2. A cable, of density pc and cross-sectional area A, is suspended vertically in the ocean (density p0) to a depth 11. Derive an expression for the tension in the cable as a function of depth z, where O S z 5 h. Tension = wéGL-t gig cable Below 2 -- bubdau'tjforce an allele lac-glow 2 2:}: :: mass of Cable belowz x5 — displace»! Mass ofwd‘erloelowz. 23 :: ﬂaw-2h “PORCH-1):? T62) = AﬂCk-2)(Pc-pa) ﬁr. -‘- Ulla»; 11.21) tCMLLM ::=O/ \$14,144 Um P¢=Pa / FEWJ»: :0 Si—Ma :é-Le (.4194: ami-jloa‘éi'uj Quiz 3. Monday, February 11‘“, 2008 PHY 252 3. The diagram is of a horizontal tube with a circular cross section everywhere and a radius of 10.0 mm at the left and right ends, A and C. The tube narrows in the middle, at B, where the cross sectional area is reduced to one-quarter of that at the ends. Water (incompressible) flows out at C at a steady horizontal velocity of 5.00 m/sec. You can assume that there is steady, non-viscous, laminar (streamline) flow everywhere. The diagram shows the tube and the streamlines. 5‘00 W560 1 Continuity: -d—V = Av Bernouilli: P + pgy + E pv2 = constant dt a. What is the velocity of water at the input end A? (1 point) no t amid-Ki _: aﬁuz :: AC1”; : AAA}:z Az=HA) cit AL \ “ u}:u-;_= Sioomise¢ b. What is the velocity of water at B? (1 point) At 3/ :Hm. Wto i6“ ﬂ—am=eae=r4m =2 Ua=Aevz = aria—9+ Ji- - +715 c. If the pressure at A is 3,800 torn, what is the pressure at C in pascal? (1 point) (A merciful hint: latm = 760 torr — you should know this!) ram EMM'S SIM-u. {-36:39 thﬁu)motvhzvc t‘. 9c: pA- ' p4 = aaootc-er (div-4 x ins-P4 : KXIDSIPa. % ?60faﬂ in. 54:044. (1. What is the pressure at B? _ (1 point) Use gamma 5,, = 3,, _ pp, + 35pm? = F‘s-tip”: 2 pvipczwc)‘ 1 pﬁ-ri-pv: : P3 +8911: (51m. 7),, =14) P5 = PA - \$2597): '. pg =5‘lDEPa "‘ 15x Ciaookjlmﬂx (Suds)!- = 312:500 Pa. 3 3424b“ _* e. For a bonus point, can you w briefly how the water flow relates to the pressure difference between A and C? (1 point) From Cc) we. W PHMJL paw”; TM 1A “0 PM“ loa‘irweui 44-an C, W twice M—o—j-m CMIELL “WW-"km are“)? Sim ﬁlmy: m ahead-j, 76W 4W— uo fﬂwfmea. “my; La Maureen‘s fme feral-AHA. Tim 5M Made-.0 at 0L ﬂuid rah 34 13M absent; erg aim (loaﬂ wrwoiddéd) Heart, dies-rm. M ION/mm C’J-loafelmm—lﬁino:t ...
View Full Document

{[ snackBarMessage ]}

### Page1 / 2

Quiz3_Solution - Quiz 3 Monday February 11m 2008 PHY 252 So...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online