An alloy steel tension strut is fabricated from a lot of material which has an ultimate strength of 135 ksi, yield strength of 120 ksi, and fatigue properties based on experiment as given below. In service the strut is subjected to the following spectrum of completely reversed axial loads during each duty cycle:

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