Moving up along the inclined road, the wind creates a drag resistance on the car of FD=1.3v2, where FD is the drag force in N and v is the velocity in m/s. The drag force acts in the opposite direction of the car’s velocity. The car acceleration is 5 m/s2 starting from rest. Find the engine's input power when t=4s.

Identify two factors that determine the rate of stream erosion

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.

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.