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trangtamtan2003
2 năm trước
Một tên lửa có m = 10 tấn kể cả chất khí xuất phát theo phương thẳng đứng lên biết tốc độ phụt khí là 1000m/s. Biết khối khí là m' = 2 tấn được phụt tức thời. a, Tính v xuất phát biết khí phụt ra trong thời gian dài và mỗi giây phụt được 1 lượng Δm=100kg b, Tính v tên lửa sau 1s đầu tiên, g=9,8m/s2
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