To accelerate, an object must * A. change both its speed and direction.
B. change its direction.
C. either change its speed or direction.
D. change its speed.

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

An object's buoyant force and weight mean the same thing.a. trueb. false

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.