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**[SOLVED] Help with a few problems**

A pair of fuzzy dice is hanging by a string from your rearview mirror. While you are accelarting from a stoplight to 20 m/s (in 5 seconds), what angle does the string make with the vertical?

A train traveling at a constant speed rounds a curve of radius 275 m. A chandelier suspended from the ceiling swings out to an angle of 17.5º throughout the turn. What is the speed of the train?

Help on where to start and how to solve the problems would be appreciated.