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Physics Physics Difficulty: Medium

During long jump, athlete runs before taking the jump. By doing so he__________________? A device used for converting a.c. into d.c. is called When the short circuit condition occurs, the current in the circuit Consider the following statements. 1. According to Kepler's first law, each planet moves in an elliptical orbit around the sun, the sun being at one of the foci of the ellipse. 2. According to Kepler's Second Law, the radius vector of any planet relative to the sun sweeps out equal areas in equal times, that is the areal velocity of the radius vector of the planet is constant. Which of the statements given above is/are correct? Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R). Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape. Reason (R): The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct?