Summary

• Density
• Pressure in fluids
• Pascal's principle

• Written Quiz    Timer
  
  
• Archimedes' principle
• buoyant forces
• sinking: object displaces its volume
• floating: object displaces its mass
• object density applet
• fluid density applet
  
• apparent weight applet

Example #1

sj6 14.28
About how many 0.125 m radius, 5 gram helium balloons do you need to get airborne? ρ_air = 1.29 kg/m³ and ρ_He = 0.179 kg/m³.
A. 200
B. 2000
C. 20,000
D. 200,000
Answer















 



C. 20,000