A disc of 8.0 cm in radius rotates at a constant rate of 1200 revolution per minute about its central axis. Calculate the
(a) angular velocity in rad s?

(b) tangential speed at a point 3.0 cm from its centre.

(c) distance travelled by a point at the edge of the disc in 2.0 s.

(d) angular acceleration if the disc stop rotating at 3.0 s.

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