Atorsion spring described below is used in a hand-held spring clamp. the jaws of the clamp are 1.5 inches from the pivot. the spring angle is 45° when the clamp is closed and 0° when the clamp is open. determine torsional spring constant, clamping force when closed and clamping force when open. use units of torque/rev for torsional spring constant. ignore end effects from the spring arms.

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.