6 In the 50 minutes between 13:10 and 14:00 the lorry travelled 25 km. Calculate the average speed in km/h.
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When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

The least penetrating form of radiation is

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