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题目:某行星沿椭圆轨道绕太阳运行,近日点离太阳的距离为a,远日点离太阳的距离为b,行星在近日点的速率为v_a,则行星在远日点的速率是:(1)v_b=b/av_a;(2)v_b=(b/a)~(2/1)v_a;(3)v_b=(a/b)~(2/1)v_a;(4)v_b=(a/b)~(2/1)v_a。常见错误答案:行星在运行中只受到太阳的引力,万有引力提供作圆运动所需的向心力,即G(Mm)/(R~2)=m(V~2)/R式中M、m分别为太阳和行星的质量。在近日点有
Title: A planet orbits the sun in an elliptical orbit. The distance from the sun to the sun is a. The distance from the sun to the sun is b. The planet’s velocity at the nearest point is v_a. The planet’s rate at the far day point is: (1) V_b=b/av_a; (2) v_b=(b/a)~(2/1)v_a; (3)v_b=(a/b)~(2/1)v_a; (4)v_b=(a/ b) ~(2/1)v_a. Common Mistakes Answer: The planet is only subject to the sun’s gravitational force during its operation. Gravity provides the centripetal force required for circular motion, that is, G(Mm)/(R~2)=m(V~2)/R where M and m are respectively For the quality of the sun and planets. In recent days there are