3. The length of the biceps muscle increases 1.7cm over the course of an overhead softball throw. The stiffness constant for the biceps is 225,000 N/cm. Calculate the strain potential energy (in Nm) of the system during the throw. Points: 4 4. If the gravitational potential energy of the softball thrown overhead is 3.3kg-m/s, calculate the height above the 5'6" softball player's head at which the ball was released. A standard softball ball weighs 6 ounces. Points: 5 5. A crane accidently drops a box full of material into a freshwater pool measuring 20 feet long, 10 feet wide, and 6 feet deep before the box is dropped causing the water level to rise to 6.05 feet after the box is dropped. The box is 10x8x12 inches and the material inside weighs 2.4 lbs/in. Water weighs 8.3 lbs/gallon. Will the object sink or float? (Hint: calculate the volume and weight of water displaced in the pool and compare it to the volume and weight of the material in the box. Then see slide 22)