Soap Definition and 103 Threads

A wet bar of soap slides freely down a ramp 9.35 m long inclined at 7.00°. How long does it take to reach the bottom? Assume muk = 0.0550. Okay I've got my x & y componants 9.35cos(7)=9.28 9.35sin(7)=1.14 But now what since I don't have the mass of the soap or the acceleration, what do I...

Show that inside a soap bubble, there must be a pressure \Delta P in excess of that outside equal to \Delta P = 4 \gamma /r where r is the radius of the buble and \gamma is the surface tension. My first question is: The pressure on what!? Are they referring to the pressure on the bubble...

To know what I'm talking about you'll have to do a little experiment... Go to your bathroom, take some soap and foam up your hands. Make a "bubble" with your index finger and your thumb, then reflect the light from a lamp in the "bubble". After a little while oil-like rainbowcolored patterns...