A small rock moves in water, and the force exerted on it by the water is given by equation f=kv. The terminal speed of the rock is measured and found to be 2.2 m/s . The rock is projected upward at an initial speed of 6.5 m/s . You can ignore the buoyancy force on the rock. Part A In the absence of fluid resistance, how high will the rock rise? Express your answer using two significant figures.

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.

What do you think car designers do if the damage caused by a crash test is too severe?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?