10) An object moves with a constant speed of 30 m/s on a circular track of radius 150 m. What is the acceleration of the object?
Answer is 6m/s^2
A=v^2/r
A=30^2/150= 6m/s^2

Aboat that travels with constant speed of 6.10 m/s in still water is to go directly across a river. the current in the river flows at 1.95 m/s. (a) at what angle must the boat be steered?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.