Acar is stopped at a traffic light. it then travels along a straight road such that its distance from the light is given by x1t2 = bt2 - ct3, where b = 2.40 m> s2 and c = 0.120 m> s3. (a) calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s. (b) calculate the instantaneous velocity of the car at t = 0, t = 5.0 s, and t = 10.0 s. (c) how long after starting from rest is the car again at rest?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.