Q1:

A simple pendulum is made from a 0.890-m-long string and a small ball attached to its free end. The ball is pulled to one side through a small angle and then released from rest. After the ball is released, how much time elapses before it attains its greatest speed? Number a Units 4} When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4x 109 N/m, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 2.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by how much does it stretch? Number Units mA gymnast does a one-arm handstand. The humerus, which is the upper arm bone between the elbow and the shoulder joint, may be approximated as a 0.32-m-long cylinder with an outer radius of 1.07 x 10"2m and a hollow inner core with a radius of 3.8 x 10-3 m. Excluding the arm, the mass of the gymnast is 54 kg. Bone has a compressional Young's modulus of 9.4 x 109 N/m2. (a) What is the compressional strain of the humerus? (b) By how much is the humerus compressed? Humerus rout (a) Number Units m/s (b) Number Units m