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Three children, each of weight 356 N, make a log raft by lashing together logs of diameter 0.30m and length 1.80 m. How many logs will be needed to keep them afloat in fresh water? Take the density of logs to be 800 kg/m^3.

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Tod Thiel
Tod ThielLv2
7 May 2018

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1. The USS Farragut (DDG-99) Guided Missle Destroyer) displaces9200 long tons (1 long ton= 2240 lbs) of seawater. Assuming theaverage density of seawater surrounding the ship is 1.024 g/mL,calculate the total volume of seawater(in m^3) displaced by theship's hull.

2. A cargo ship of 455 ft. length, 62 ft. beam, and 38 ft. depth(deack to keel) has been loaded so much that is displaces 15,036.75m^3 of seawater (assume a uniform density of 1.024 g/m). What isthe total weight of the cargo ship (in kg) with its present load?If you first calculate the ship's overall volume, what is theship's overall density (in g/mL)? If there was a hull breach, howmuch seawater (in m^3) could she take on before sinking?

3. Your ship is in the middle of the Pacific Ocean, in waters 4500meters deep. While enjoying the day on deck, a breeze picks up atiny grain of quartz sand (0.3 mm diameter, 2.65 g/mL) in your hairand carries it out to sea. If the sand grain is deposited on theocean surface, how long will it take to sink to the ocean floor(assuming a perfectly still ocean with a uniform density=1.024g/mL)?
v (setting)= (2r^2g(d(particle)-d(fluid))/9u

r=particleradius (m)

g= 9.8m/s^2

d=density (kg*m^-3)

u=(1.17*10^-6 m^2 s^-1)* d(fluid)

4. If the particle in Question 3 were a flake of dandruffinstead (1.035 g/mL), at what depth would the dandruff flake ceaseits descent in a layered ocean like the one dipicted here? How longwill it take for the dandruff flake to reach its final destination?Make sure you choose a meaingful unit of time; a simple algebraicmethod is fine.

1.017g/mL 500m

1.025g/mL 2000m

1.028g/mL 2600m

1.032g/mL 3175m

1.037g/mL 3800m

1.042g/mL 4500m

Question 1
What hanging mass will stretch a 1.5-m-long, 0.64mm - diametersteel wire by 1.0mm?

Question 2
The density of aluminum is 2700 kg/m^3. How many atoms are in a1.20cm x 1.20cm x 1.20cm cube of aluminum?

Question 3
Smoking tobacco is bad for your circulatory health. In an attemptto maintain the blood's capacity to deliver oxygen, the bodyincreases its red blood cell production, and this increases theviscosity of the blood. In addition, nicotine from tobacco causesarteries to constrict. For a nonsmoker, with blood viscosity of2.5x10^-3 Pa*s, normal blood flow requires a pressure difference of8.0 mm of Hg between the two ends of an artery. If this person wereto smoke regularly, his blood viscosity would increase to 2.7x10^-3 Pa*s, and the arterial diameter would constrict to 90% ofits normal value. What pressure difference would be needed tomaintain the same blood flow?

Question 4
A stiff, 15 cm-long tube with an inner diameter of 3.0 mm isattached to a small hole in the side of a tall beaker. The tubesticks out horizontally. The beaker is filled with 20 degreesCelsius water to a level 50 cm above the hole, and it iscontinually topped off to it maintain that level.What is the volumeflow rate through the tube?

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