To develop muscle tone, a woman lifts a 2.4 kg weight held in her hand. she uses her biceps muscle to flex the lower arm through an angle of 21°. what is the instantaneous angular acceleration if she starts her workout with her arm vertical in the downwards direction? assume the weight is 29 cm from the elbow joint, her forearm has a moment of inertia of 0.245 kg⋅m2, and the muscle force is 850 n at an effective perpendicular lever arm of 1.7 cm in rad/s2.

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