通过影子长度求2根杆子的距离原文如下:Two vertical 3 m poles are used to measure the radius of the Earth.For one,the Sun is overhead and casts no shadow,The other is at the same longitude and it casts a shadow 20cm in length.How far ap
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通过影子长度求2根杆子的距离原文如下:Two vertical 3 m poles are used to measure the radius of the Earth.For one,the Sun is overhead and casts no shadow,The other is at the same longitude and it casts a shadow 20cm in length.How far ap
通过影子长度求2根杆子的距离
原文如下:Two vertical 3 m poles are used to measure the radius of the Earth.For one,the Sun is overhead and casts no shadow,The other is at the same longitude and it casts a shadow 20cm in length.How far apart the poles?(Assume that the radius of the Earth is 6370 km ).实验通过两根3米长的竿来测量地球的半径,其中一根正好在太阳底下没有影子,而在同一经线上另外一根竿有20厘米长的影子,已知地球半径是6370km,求两杆的距离.
通过影子长度求2根杆子的距离原文如下:Two vertical 3 m poles are used to measure the radius of the Earth.For one,the Sun is overhead and casts no shadow,The other is at the same longitude and it casts a shadow 20cm in length.How far ap
楼上的没弄懂题意.
其实有两个常识性近似.
1太阳很远,认为其射过来的是平行光.
2.20cm相对地球半径相差很大,认为其是直的而不随地球表面弯曲.
知道这两个事,这题就很简单啦
我觉得和地球半径没有关系，而是和太阳到地球的距离有关。