a ball of mass m is attached to a string of length r and negligible mass. the ball moves clockwise in a vertical circle, as shown above. when the ball is at point p, the string is horizontal. point q is at the bottom of the circle and point z is at the top of the circle. air resistance is negligible. express all algebraic answers in terms of the given quantities and fundamental constants.

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation