Aspaceship, 150 m long as seen on board, moves by the earth at 0.914c. what is its length (in m) as measured by an earth-bound observer?

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?