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A 120-kg wooden raft (p=800kg/m^3) floats in a freshwater canal

Physics
Tutor: None Selected Time limit: 1 Day

1) What fraction of the raft is submerged?
2) if the canal has a diameter of 10m, and the water flows with a velocity of 4m/s, how fast will it flow when it reaches the river (diameter=20m)?
3)A stripe is painted at the level of the water when the raft is in the river.  If the raft drifts to the ocean (p=1025kg/m^3), will the stripe be above, below, or at the water level?

Apr 17th, 2015

1) the fraction is (1000-800)/1000 = 20% 

2) 10*10 *4 = 20*20*V 

V = 1m/s 

3) the stripe will be above the water level, because the raft will emerge less into the water. 

Apr 17th, 2015

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Apr 17th, 2015
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Apr 17th, 2015
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