At noon on a cloud-free summer day, sunlight intensities at the Earth’s surface are nearly always less than 940 W/m2 (0.12 hp/ft2 ). (a) At this intensity, if the solar collector and electric motor could convert 10% of the collected solar energy to mechanical power, how large a collector would be required on a tractor to supply 100 kW (134 hp) of mechanical power? (b) If the length of the collector was twice its width, what would be the dimensions of the collector?

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