A lady is driving a car clockwise around a circular track of radius 20m. It takes her 105 s to complete one lap around the track. Find the driver’s speed, and centripetal acceleration.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory