Chapter 15: Problem 5
Why is it easier to float in the ocean than in fresh water?
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Chapter 15: Problem 5
Why is it easier to float in the ocean than in fresh water?
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You're a robotics engineer designing a hydraulic system to move a robotic arm. The hydraulic cylinder that drives the arm has diameter \(5.0 \mathrm{cm}\) and can exert a maximum force of \(5.6 \mathrm{kN} .\) Hydraulic tubing comes rated in multiples of \(1 / 2 \mathrm{MPa},\) and for safety, you're to specify tubing capable of withstanding \(50 \%\) greater pressure than it will ever experience in use. What pressure rating do you specify?
Styrofoam's density is \(160 \mathrm{kg} / \mathrm{m}^{3} .\) What percent error is introduced by weighing a Styrofoam block in air (density \(1.2 \mathrm{kg} / \mathrm{m}^{3}\) ), which exerts an upward buoyancy force, rather than in vacuum?
A vertical tube \(1.0 \mathrm{cm}\) in diameter and open at the top contains \(\left.5.0 \mathrm{g} \text { of oil (density } 0.82 \mathrm{g} / \mathrm{cm}^{3}\right)\) floating on \(5.0 \mathrm{g}\) of water. Find the gauge pressure (a) at the oil-water interface and (b) at the bottom.
Compressed air with mass \(8.8 \mathrm{kg}\) is stored in a \(0.050-\mathrm{m}^{3}\) cylinder. (a) What's the density of the compressed air? (b) What volume would the same gas occupy at a typical atmospheric density of \(1.2 \mathrm{kg} / \mathrm{m}^{3} ?\)
A typical human aorta, the main artery from the heart, is \(1.8 \mathrm{cm}\) in diameter and carries blood at \(35 \mathrm{cm} / \mathrm{s}\). Find the flow speed around a clot that reduces the flow area by \(80 \%\)
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