Q. A wooden raft has a mass of 65 kg. When empty it floats in water (density 1000 kg/m3) with 41% of its volume submerged. What mass of sand can be put on the raft without it sinking?
Q. A relaxed biceps muscle requires a force of 25.0 N for an elongation of 3.0 cm; the same muscle under maximum tension requires a force of 500 N for the same elongation. Find Young's modulus for the muscle tissue under each of these conditions if the muscle is assumed to be a uniform cylinder with length 0.200 m and cross sectional area 50.0 cm^2.