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WOW Notes #1 CFU: Density1) What is the mass of 350 cm3 of H2O?
Answer: 350 g
2) What is the volume of 450 kg of H2O? Answer: 0.450 m3
3) ρAl = 2.64 = _______ Answer: 2640
4) What is the mass of 0.500 m3 of Aluminum? Answer: 1320 kg
WOW Notes #2 CFU: Weight5) What is the weight of 0.250 m3 of H2O?
Answer: 2450 N
6) What is the weight of 700. cm3 of Aluminum?
Answer: 18.1 N
WOW Notes #3: Other “density” valuesNote: Sometimes density is given in
weight/volume instead of mass/volume
values for water:8.33 or 62.4 or 2.20
ρg
Fg
V
WOW Notes #3 CFU: Other density values7. What is the weight in pounds of 50.0 gallons
of water? Answer: 417 lbs.
8. What is the volume in cubic feet of 150 pounds of water?
Answer: 2.4 cubic feet
9. What is the weight in pounds of the water contained in 13-2.0 Liter bottles of water?
Answer: 57 lbs.
WOW Notes #4: Archimedes and Buoyant ForceArchimedesWhen a solid object is immersed in a fluid it
displaces a volume of fluid equal to the volume of the solid.
WOW Notes #4 ContinuedArchimedes’ Principle: When an object is
immersed in a fluid, it experiences a buoyant force equal to the weight of displaced fluid.
WOW Notes #4 ContinuedApparent Weight = “true” weight– weight of displaced
fluid (buoyant force)
Fg´= Fg – Fb Fg´= Voρog – Vfρfgo = object and f = fluid
Also works with mass instead of weightThat is…apparent mass = “true” mass – mass of displaced
fluid (buoyant “force”)
WOW Notes #4 CFU: Archimedes and Buoyant ForceWhat is the apparent weight of the aluminum
block pictured when it is immersed in water?Answer: 1.1 N
0.050 meters
0.045 meters
0.030 meters
Aluminum
WOW Notes #5: FloatingWhen an object FLOATS, the buoyant force
and the object’s weight are equal to each other…NO NET FORCE.
When an object is placed in a fluid it will either…Sink to the bottom because the weight of fluid
it displaces (buoyant force) is less than the weight of the object. (the net force is downward)
Sink into the fluid only to the point where it has displaced a volume of fluid equal to its weight. (the net force is zero)
WOW Notes #5 CFU: Floating1) Cannonball floating?2) Explain your observations of the cannonball
using the following vocabulary. (underline)1) Density, buoyant force, weight,
displace/displacement, net force, volume
WOW Notes #7: DraftTo calculate “Draft” as a ratio:
Divide the volume of water necessary to displace by the volume of water that can be displaced.
Divide the weight you must support by the weight of water that can be displaced.