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

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−21 newtons?