A car is rounding a curve. Friction between the tires and the flat road surface provides the force needed to keep the car on the road. A driver can round this curve on a dry road with a coefficient of friction of 0.68 0.68 at a speed of 28 m/s 28 m/s. What must the speed be on ice with a coefficient of friction of 0.15 0.15

Abanked road comer of radius 146 m is to be constructed. if the comer is designed for vehicles moving with a speed of 20.0 m/s, what should the banking angle be, in units of degrees?

What are the applications of electromagnetic waves

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".