Conditions
1. Work with a partner.
2. Open Book.
3. Open Notes.
4. Calculators Allowed.
5. Six points up for grabs.
A sphere of steel (S = 7.8) is on the bottom of the
ocean at a depth of 60 ft. The sphere has a volume of
1.5 liters. What is the buoyant force (in newtons) on the
sphere?
1.
2.
3.
4.
5.
6.
15.1N
115 N
118 N
274 N
14,500 N
None of the above
What is the approximate buoyant force (in newtons) acting on a floating basketball? The ball has a
mass of 600 g, an inflation pressure of 8 psig, and
a circumference of 29.5 inches? Assume the water
is at 15oC.
1. 6 N
2. 8 N
3. 10 N
4. 12 N
5. 22 N
6. 24 N
7. 26 N
A SCUBA diver is swimming in the ocean while carrying a basketball. As the diver descends in depth,
what happens to the buoyant force on the basketball?
The buoyant force
1. Increases
2. Decreases
3. Stays the same
The balloons are identical except balloon A is filled with
helium and balloon B is filled with air.
Balloon filled
with helium
Case A
Balloon filled
with air
Case B
Regarding the Buoyant force on the balloons:
1.
2.
3.
4.
(Buoyant force A) = (Buoyant force B)
(Buoyant force A) > (Buoyant force B)
(Buoyant force B) < (Buoyant force A)
Cannot be determined without more information
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Physics
Buoyant force is due to the hydrostatic pressure distribution. ==> Does not matter what the object is.
Math
(Buoyant force) = (Weight of the displaced fluid)
In Case A and Case B, the same weight of air is displaced.
The sketch shows two identical containers filled
with water. The level of water in same in each
container.
Container B has a duck floating in it. Each container is weighed.
Which statement is most correct?
1. Container A weighs more than B
2. Container B weighs more than A
3. Weight of A = Weight of B
A rectangular block (S = 0.9) is floating in water.
Then, oil (S = 0.8) is poured over the block until the
block is completely immersed in the oil/water mixture.
Oil
Regarding the location of the block relative to surface of
the water.
1.
2.
3.
4.
The block will move up
The block will move down
The block will not change its location
There is not enough information to answer
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