Physics, 01.07.2021 14:00, imatrueguyp612be

Nếu quả nặng E có trọng lượng 30 lb và góc 15o
 
, xác định trọng lượng của quả nặng F và lực

căng trong các sợi dây DC, CB, và BA để hệ ở trạng thái cân bằng.

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Nếu quả nặng E có trọng lượng 30 lb và góc 15o
 
, xác định trọng lượng của quả nặng...