Stars within the halo move in random orbits that extend above and below the disk of the galaxy is called

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.

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

The force it would take to accelerate an 900-kg car at the rate of 6m/s2