1 1.The gravitational force___an object at the Earth’s surface is called the weight of the object A.being acted on B acting on C having acted on D to act on Gravitational 重力的 我觉得是选D的吧,是要求不定式做宾语补语 但答案怎么是B呢 再说了 force后面能跟动名词么?(求ACD不能选的原...
This chapter considers the gravitational field of the earth. The chapter mentions the forces acting on elementary volume of the rotating Earth in an inertial frame and considers the second Newton's law in non-inertial system. It introduces the centrifugal force and gravitational field, as well as...
If the distance between the Earth and the Moon were to double, while the masses remained the same, the gravitational force would become ___. A. F/2 B. F/4 C. 2F D. 4F 相关知识点: 试题来源: 解析 B。引力与距离的平方成反比,距离变为 2 倍,引力变为原来的 1/4,答案是 B 选项...
A. their size B. their weight C. their distance to Earth D. the depth of the oceans 相关知识点: 试题来源: 解析 C 正确答案:C 解析:根据文章第四段中的第二句“Although the Sun is larger than the Moon.The Moon is closerto Earth and,therefore,its gravitational force is approximately 2.2...
If you weigh 90 pounds, you___to the earth by a gravitational force of 90 gounds. A. have pulled B. pull down C. are being pulled D. have been pulled 相关知识点: 试题来源: 解析 C 应选[C],本句为被动语态的正在进行时态。〔A〕项语态错误,〔B〕项不仅语态错误,还用了错误的介词与动...
The gravitational force of the Sun and the Moon upon Earth depends on ___. A. their size B. the depth of the oceans C. their weight D. their distance to E. arth 相关知识点: 试题来源: 解析 D 答案:D 解析:分析第三段可知,太阳和月亮对地球的引力与其和地球的距离有关。反馈...
The gravitational field at a point in space equals the gravitational force experienced by a test particle placed at that point divided by the mass of the test particle. Note that the presence of the test particle is not necessary for the filed to exist -- the Earth creates the gravitational...
Journal of the Franklin InstituteWilson, Raymond H., Jr.: A Gravitational Force Function for the Earth Repre- senting All Deviations From a Spherical Geoid. Franklin Inst. Jour.. ,. vol. 268, no. 5,. Nov. 1959, pp. 378-387.
Based on the above discussion we come to know that weight is a gravitational force acting between the earth and an object. Due to this gravitational force, the earth pulls any object towards its surface. Therefore, the direction of the weight of the object is towards the earth's center....
A simplified formula that relates weight and mass comes from the previously presented equation for the force of gravity. Weight = mass x acceleration of gravity (g) Where g has a value approximately equals to 9.81m/s2 for a body near the surface of the Earth. Lesson...