【简答题】(1) Find the expression of t he free-fall acceleration at a location which is h distance above the Earth’s suce. Suppose that radius R E and mass M E of the Earth is known. (2) Using the known radi...
【简答题】阅读理解。 One day a farmer went out for a walk with his daughter. The farmer put on a pair of wrong shoes one with a thick sole (鞋底) and the other with a thin one. So as he began to walk, he ...