1

This print-out should have 9 questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.

Holt SF 09Rev 18001 10.0 points

A piston A has a diameter of 0.63 cm, asshown. A second piston B has a diameter of2.2 cm.

A

B

561.2 NF

In the absence of friction, determine themagnitude of the force !F necessary to supportthe 561.2 N weight.

Correct answer: 46.0207 N.

Deep in the Ocean002 (part 1 of 2) 10.0 points

Engineers have developed a bathyscaph thatcan reach ocean depths of 10.9 mi.If the density of seawater is about

1030 kg/m3, what is the absolute pressureat that depth? The acceleration of gravity is9.8 m/s2 .

003 (part 2 of 2) 10.0 pointsIf the inside of the vessel is maintained atatmospheric pressure 1.013× 105 Pa, whatis the net force on a porthole of diameter18.9 cm?

Holt SF 09A 02004 10.0 points

A 3.4 kg rectangular air mattress is 2.66 mlong, 0.868 m wide, and 0.178 m thick.

What mass can it support in water beforesinking?

Correct answer: 407.581 kg.

Serway CP 09 33005 10.0 points

An empty rubber balloon has a mass of0.0127 kg . The balloon is filled with heliumat a density of 0.184 kg/m3 . At this densitythe balloon has a radius of 0.54 m .If the filled balloon is fastened to a vertical

line, what is the tension in the line? Theacceleration of gravity is 9.8 m/s2 .

Correct answer: 7.02464 N.

Holt SF 09Rev 62006 10.0 points

A cowboy at a ranch fills a water trough thatis 1.4 m long, 70 cm wide, and 47 cm deep. Heuses a hose having a diameter of 2.3 cm, andthe water emerges from the hose at 1.2 m/s.How long does it take the cowboy to fill the

trough?

Serway CP 09 45007 10.0 points

A jet of water squirts out horizontally from ahole on the side of the tank as shown below.

2

0.538 m

1.54 m

h

If the hole has a diameter of 3.81 mm , whatis the height of the water above the hole inthe tank?

Correct answer: 4.69877 cm.

Constricted Pipe 03008 (part 1 of 2) 10.0 points

A liquid of density 1265 kg/m3 flows withspeed 2.12 m/s into a pipe of diameter 0.13 m .The diameter of the pipe decreases to 0.05 mat its exit end. The exit end of the pipe is8.99 m lower than the entrance of the pipe,and the pressure at the exit of the pipe is1.4 atm .

P1

2.12 m/s0.13 m

P2

v20.05 m

1.4 atm 8.99 m

What is the velocity v2 of the liquid flowingout of the exit end of the pipe? Assume theviscosity of the fluid is negligible and the fluidis incompressible. The acceleration of gravityis 9.8 m/s2 and Patm = 1.013× 105 Pa.

Correct answer: 14.3312 m/s.

009 (part 2 of 2) 10.0 pointsApplying Bernoulli’s principle, what is thepressure P1 at the entrance end of the pipe?

Correct answer: 1.57433× 105 Pa.