What is easier to move a box from rest or to move it when it is already in motion

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.