1.) a steel rod is 3 cm in diameter at 25 C. a brass ring has an interior diameter of 2.992 cm at 25 C. at what common temperture will the ring just slide into the rod? for this Q, i am not too sure which equation to use. i think it's the volume change one, which is delta V= beta(Vo)(delta T) but i dont know how the temperature and the diameter is going to fit in... 2.) a grandfather's clock is calibrated at a temperature of 20 C. the pendulum is a think brass rod with a heavy mass attached to the end. on a hot day, when the temperature is 30 C, does the clock run fast or slow? how much time does it gain or lose in a 24 hour period? this Q...i just have no idea how to start..... thanks in advance, any suggestions/comments are greatly appreciated.