標題:
Phy CE past paper mc mechanics
發問:
An object is acted on by three forces F1, F2 and F3 in suitable directions such that it remains at rest. Which of the following Combinations of the magnitude of the forces is/are possble? F1 F2 F3(1) 3N 4N 5N(2) 3N 4N 7N(3) 3N 5N 9NA. (2) only B.(3) only C. (1) and... 顯示更多 An object is acted on by three forces F1, F2 and F3 in suitable directions such that it remains at rest. Which of the following Combinations of the magnitude of the forces is/are possble? F1 F2 F3 (1) 3N 4N 5N (2) 3N 4N 7N (3) 3N 5N 9N A. (2) only B.(3) only C. (1) and (2) only D.(1) and (3) only Why B is the answer?
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最佳解答:
Ans is C. 圖片參考：http://j.imagehost.org/0927/ScreenHunter_33_Apr_19_23_53.gif http://j.imagehost.org/0927/ScreenHunter_33_Apr_19_23_53.gif
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