Aparticle is in uniform circular motion about the origin of an xy coordinate system, moving counter-clockwise with a period of 6.50 s. at one instant, its position vector (from the origin) is r with arrow = (6.00 m)i hat − (6.00 m)j. at that instant, what is its velocity in unit-vector notation?

Explanation:

Given

Time Period

Position Vector

Since it is moving in a circular path therefore magnitude of position vector will give the radius of circular path

this velocity is at angle of

velocity

Therefore unit velocity vector

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.