【单选题】if a speaker uses a simple example of the well-known Golden Gate Bridge when illustrating the topic of suspension bridge, what is his purpose by doing so?
【单选题】A thin rod whose length L is 12.4cm and whose mass m is 135g, suspended at its midpoint from a long wire. Its period T a of angular SHM is to be 2.53s. An irregularly shaped object X is then hung from...