Aphysics experiment is done in which three masses are used to balance a bar on a fulcrum. two masses (21 kg and 12 kg) are placed on one side of the fulcrum, 12 cm and 21 cm away, respectively. where must the third mass (18 kg) be placed in order to make the bar balance?

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?