# practice problems for ex 1 fall18.doc - 1. How large a...

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1. How large a force is necessary to stretch a 2.0-mm-diameter steel wire (E= 2.01011N/m2) by 1.0%?N
2. Crew members attempt to escape from a damaged submarine 80 m below the surface. What force must theyapply to a pop-out hatch of radius of 18 cm to push it out? Assume the density of ocean water 1025 kg/m3.
3.A cylindrical submarine with mass 20 x 105kg , radius of 2.75 m and length of 100 m is anchored to thebottom of a channel as shown schematicallyin the figure. What is the tension in the cable assuming thesubmarine is totally submerged?N
4.A 1500 g block of wood floats in a container of oil (the oil’s density is 750 kg/m3). What volume ofoil does thewood displace?
5. A sample of unknown material appears to weigh 300 N in air and 200 N when immersed in water. What isthe density of the material? (the density of water is 1000 kg/m33

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Term
Fall
Professor
Sha'Queel Dyer
Tags