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  1. A

    Simple Loop Problem

    yup conservation of energy is the way to go
  2. A

    Pressure in a bottle

    firstly your conversion of atm to pascals is wrong....cos 5.4 atm = 547 155 pascals secondly p= force/area area = 2.54X10^-4 m2 thus force = area X pressure = 139 N
  3. A

    Angular accelaration problem help

    Basically the penny will begin to slip when the centrifugal force is greater than the frictional force. Your frictional force is Umg where U is the coefficient of friction(0.5) in this case. Ur centrifugal force will be mw^2r where w is the angular velocity. solve for Umg=mw^2r first to get w...