Your friend you place a 105 kg sofa in the back of a 2600 kg truck. your keen vision tells you that the truck sinks 3.5 cm on its springs when you place the sofa. with what frequency (in hz) will the truck and the sofa oscillate on the springs?

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.