Aboat passes a fixed buoy at 9: 00 am heading due west at 3 m/h. another boat passes the same buoy at 10 am heading due north at 5 m/r. how fast is the distance between the boats changing at 11: 30 am?

An astronomer at the equator measures the doppler shift of sunlight at sunset. from this, she calculates that earth’s tangential velocity at the equator is 465 m/s. the centripetal acceleration at the equator is 3.41  10 2 m/s 2 . use this data to calculate earth’s radius.

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

True or false: the revolution of the earth creates day and night as it rotates around the sun