[填空题]
Suppose the space sh;v,b wbt91 tbo.ggkq)*n0ho.fd7eril2o ., ue: chwuuttle is in orbit 400 km from the Earth's surface, and circles the Earth about once every0o2. dnuc*erf:h .h e7 u,lwoi 90 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g , the gravitational acceleration at the Earth's surface. $\approx$ g
