Question 8 5 pts A mass m at the end of a spring oscillates with a frequency of 0.65 Hz. When an additional 600-g mass is added to m, the frequency is 0.45 Hz. What is the value of m (in kg)? S Question 9 5 pts How long must a simple pendulum be if it is to make exactly one swing in 1.4s? (That is one complete oscillation takes 2.85.) E Question 10 5 pts A 0.45 kg cord is stretched between two supports 7.5m apart. When one support is struck by a hammer. a transverse wave travels down the cord and reaches the other support in 0.75. What is the tension in the cord? E