Aflat (unbanked) curve on a highway has a radius of 170.0 m. a car rounds the curve at a speed of 25.0 m> s. (a) what is the minimum coefficient of static friction that will prevent sliding? (b) suppose that the highway is icy and the coefficient of static friction between the tires and pavement is only one-third of what you found in part (a). what should be the maximum speed of the car so that it can round the curve safely?

An charge with mass m and charge q is emitted from the origin, (x, y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.