3/15 What mass mB will cause the system to be in equi­librium? Neglect all friction, #statics

4.22 The uniform plank ABC weighs 400 N. It is supported by a pin at A anda cable that runs #statics

Buoyancy is the upward force exerted by a fluid, such as water, that opposes the weight of an object submerged in it. When an object is placed in water, it displaces a certain volume of water, and the water in turn exerts a force that can cause the object to float if this force is greater than the object's weight. This is known as Archimedes' principle and explains why some objects float while others sink. In "Pirates of the Caribbean," Jack Sparrow and Will Turner use an upturned boat as a make