94.17: A cork has weil2 umndlrljn67jg )3-ce (q)aght mg and density 25% of water density. A string is tied around the cork and attached to the bottom of a water-filled container. As shown in the accomp7cu l-3 e6(2rg jjnl)nma)dqlanying figure, the cork is totally immersed in the water. Expressed in terms of the cork weight mg, the tension in the string is:

  01.20: When submerged underwater, the apparent mass of one cubic centimeter of p i/pn4m 67s1ytrq3oaqure gold it1n4s7y /q mirqp3 ao6s 18.3 grams. What would be its mass in air?

  04.29: Three fishing bobbers all individually fnqcpz wan g5/tv,9)u 9loat on top of water. BobbersA and B have identical masses and densities but different shapes while bobbers B and C have identical sizes and shapes but bobber C has less masscv 9/u9tznw5 )anpg,q and density than B. If three identical weights are then tied to the bobbers and all three are pulled completely beneath the surface of the water, which bobber will displace the greatest volume of water?

  01.18: Which of the fl3420qsa:e t pndn9lc ollowing is the best statement of Pascal's Law?

  05.24: The hydraulic press, which allows large masses to be lifted with small at )m:ywih om3. st.+rxpplied forces, is a consequence ofs)thmtx3o i.+m.y rw : which principle?

  06.30: A copper blocko b5*dud90zd -xh5kpz is connected to a string and submerged in a container of wad-dh 955xpo *dzzu bk0ter.
Position 1: The copper is completely submerged, but just under the surface of the water.
Position 2: The copper is completely submerged, mid-way between the water surface and the bottom of the container.
Position 3: The copper is completely submerged, but just above the bottom surface of the container. Assume that the water is incompressible. What is the ranking of the buoyant forces (B) acting on the copper blocks for these positions, from least to greater?

  07.36: A driveway is 22.0 m long and 5.0 m wide. If 4yx7ir(odtv+38g hci1vkvt3 the atmospheric pressure is yk +rth od87g3t4(x3v1icivv $1.0 × 10^{5}Pa$, what force does the atmosphere exert on the driveway?

  10.22: A small and uniform 10.0 kg object floats at rest wm aws llxsd/vb dq77f3 4)b.5xith 75% of the object sub slb 5vdb3fx/7.xas)q7 d4mwlmerged in a cubical tank containing $50.0 m^{3}$ of water. What is the buoyant force acting on the object?

  14.26: A solid cube of iron and a sol pcznm(gg2j3f(bz* b7zb6 qz-id cube of aluminum have equal mass. The cubes a7f*6zgq3zb 2p jzgbmzc (-(bn replaced into the same large pool of water so that each is completely submerged and resting on the pool’sbottom. Which object experiences the greater buoyant force from the water?

  12.21: A child’s balloon is filled with pure Xenon gas. :bvpqk( ,dow*3 dowi*ti0cbv0vq,40 s lns8v This balloon then is released from rest two meters above t *osq,840kiwb 0l,(n *ivwov pvqbddc0ts: v 3he ground on Earth. Which one of the following choices best describes the response of the balloon?

  16.23: At a party, two spherical balloons are expanded to have thee5k)xq95/n et 5 +m; v3zww4vfy 9pnlg1 etpkl same radius. Balloon #1 is filled with helium gas while balloon #2 is filled with xenon gas. Which one of the following tleel1nx5;/+v )5 k3 qw9 ywvegp pk549zftnmstatements about the buoyant forces on the balloons is correct?

  03.36: An ideal fluid flows through a long horizontal circular pipe. In oobjrl8mk: *f/ ne region of the pipe, it has radius R. The pipe then widens to radius 2R. What is the ratio of the fluid's sp m:rkol8/ f*jbeed in the region of radius R to the speed of the fluid in region with radius 2R?

  04.24: A fluid is forced through a pipe of changing cross section as d tcrp*t.f29jbk,kmr.2px5 kshown. In which section would the pressure of the fluid be a minimm *xrkkt2 2f.pjpk5cd.tb9 ,rum?

  07.35: Two objects labeled K and L have equal mass bus ;1:r2mmonl 3ln(p / c2lvu4nwx(qjgt densities 0.95D0 and D0, respectively. Each of these objects floats after being thrown into n /q(pl mon;2nrw(g:v l2mu ljcx3s41a deep swimming pool. Which is true about the buoyant forces acting on these objects?

  08.16: A block is connected to a light string attached 2ti4)g k xe pc2x sobd4)k*/fyto the bottom of a large container of water. The tension in the string is 3.0 N. The gravitational force from the earf2x2 4 *4g)betdky/i xo )cpksth on the block is 5.0N. What is the block’svolume?

  15.30: A spring scale readbs(2j8c ucg q l(30isss 2.50N when a small solid mass hangs from it in air. The spring scale reads 1.58N when the mass at the end of the spring is completely submerged in a container of water. Which one of the following choics(q02c8c3jss il g( bues best represents the density of the solid mass(unit: $kg/m^{3}$)?

  09.32: A cube of unkn:sh 9nnud 1v6jown material and uniform density floats in a container of water with 60% of its volume submerged. If this same cube were placedvnjush :96nd1 in a container of oil with density$ρ=800 kg/m^{3}$ , what portion of the cube’s volume would be submerged while floating?

  12.47: Water flows ideally through a5l*7a1u ,sgt+bo tbsdm 0z )yj cylindrically-shaped pipe. At the lower end, the pipe’s cross- sectional a tb ds1aj*ztm uo,g0y s+l5b)7rea is $ 30.0 cm^{2}$ whereas in the upper portion, the pipe’s cross-sectional area is $10.0cm^{2}$ and fluid is moving at 9.0 m/s. Which one of the following choices best represents the difference in pressure between the lower section of the pipe and the upper section if the vertical distance between the centers of the pipe sections is 2.0 m ?

  09.35: A piece of an hx q1lc6j/9vjideal fluid is marked as it moves along a horizontal streamline through a pipe, as shown in the figure. In Region I, the speed of the fluid on the streamline is V. The cylindrical, horizontal pipe narrows so that tc/16v jx 9hjqlhe radius of the pipe in Region II is half of what it was in Region I. What is the speed of the marked fluid when it is in Region II?

  13.25: An ideal fluid completely fills a small horizonczxc+b3n 3 47 9obkqhftal tube that has a narrowing cross-sectional area as seen in the figure. Which one of the following choices best describes what has happened to the fluid’s speed and its associated press+f93hb c743xcq oknzb ure in the narrower region as compared to the wider region?

  10.47: An open cylindrical container with very large rad58m.fzwe2u tk0b oxw9*otpd* ius is at rest a distance H above the ground at the edge of a platform. A tiny hole develops at the bottom of the container and water xut8 w*5t0ed9 fwo mk*2p oz.bfrom the container squirts out horizontally landing a distance H from the edge of the platform. For the
water to land at this location, what is the depth of the water L in the container? The figure is not drawn to scale and air resistance is ignored.

  11.27: The density of ag 1iud*;sxvu.;h 0fzcj i-+ )q+p xnzp solid cubic block is given as $ρ=0.750 g/cm^{3}$ . This block is dropped into a large swimming pool filled with water. When equilibrium is established and all motion stops, which choice best describes the location of the block? The block is very small in comparison to the pool.

  17.22: A large swimming pool is filled with a liquid having a density ofvif6qkt365cm . : hvff $500kg/m^{3}$ . Aperson wants to see what happens if she jumps into the deep end of the pool (3.0 meters deep). Which one of the following choices correctly identifies what will happen to the person? Assume that the person does not try to move their arms or legs until discovering what happens after equilibrium is established.

  13.50: AU-tube is filled wi1mn 7xi 9j-virvdc-f /kz 1h:rth mercury (density $13.6g/cm^{3}$) as shown in the left-most figure. Water of mass 800 grams is added to the left-hand side of the tube. When equilibrium is re-established, the tube appears as shown in the right-most figure. The cross-sectional area of the left tube is$ 6.5 cm^{2}$ while the right tube has cross-sectional area $15.0 cm^{2}$. Which one of the following choices best represents the height above the original equilibrium that the mercury rises in the right tube? The drawings are not to scale.