Abicycle traveled 150 meters west from point a to point b. then it took the same route and came back to point a. it took a total of 2 minutes for the bicycle to return to point a. what is the average speed and average velocity of the bicycle? a. the average speed is 2.5 meters/second, and the average velocity is 2.5 meters/second east. b. the average speed is 0 meters/second, and the average velocity is 2.5 meters/second east. c. the average speed and average velocity are both 0 meters/second. d. the average speed is 2.5 meters/second, and the average velocity is 0 meters/second.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

12. a body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in a. size and shape. b. motion and force c. time and space. d. location and movement.