A woman walks 3.30 km north and then 2.25 km east, all in 2.80 hours. (a) What is the magnitude (in km) and direction (in degrees north of east) of her displacement during the given time?
magnitude
km
direction ? north of east
(b) What is the magnitude (in km/h) and direction (in degrees north of east) of her average velocity during the given time?
magnitude? km/h
direction ? ° north of east
(c) What was her average speed (in km/h) during the same time interval?
km/h

Avalue that describes how heavy an object is and is related to the force of gravity is

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

How is zig zagging a form of acceleration?