Two masses, m1 = 9 kg and m2 = 3 kg, are placed at the 60-cm…

Two masses, m1 = 9 kg and m2 = 3 kg, are placed at the 60-cm and 100-cm marks of a meter stick, respectively.  The meter stick has no mass and it is free to rotate about a frictionless pivot at the 0-cm end.  The meter stick is released from rest in the horizontal position.  What is the magnitude of the initial linear acceleration of m1? (Select closest answer)

A woman who weighs 400 N stands on an uniform board that wei…

A woman who weighs 400 N stands on an uniform board that weights 500 N and is 10 m long.   The board is supported at points A and B.  The support force at B is twice the support force at A.  How far from the left end is the woman standing?  (Select closest answer)

A scuba diver has his lungs filled to 3 liters when 10 meter…

A scuba diver has his lungs filled to 3 liters when 10 meters below the surface and at a temperature of 10 oC. The diver holds his breath while quietly rising to a depth of 5 meters which is at a warmer temperature of 20 oC. What will be the volume of the diver’s lungs (in liters) at this 5-meter depth?  (Note:  The density of water is 1000 kg/m3 and an approximation for pressure with depth in water may be used.)