Ahhhhhhhhh I'm stuck at this physics problem! I thought I at least knew tension is 9.8 * 7100 but thats not right! please help, thank u!
A cubic meter of some material has a mass of 7100 kg. The block of material is lowered into a lake by a strong cable until the block is completely submerged. (Free fall diagram can be made).
Find the buoyant force on the block and the tension in the cable (answers in N)
2007-10-29 13:55:27 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Physics
*should read bouyant force in question.
2007-10-29 13:55:48 · update #1
The forces on the mass m=7100kg are:
W = -mg (weight of mass, downward)
T (the upward tension in he string), and
W_b (read "W subscript b", the buoyant force, upward)
Because the mass isn't moving, the net force is 0, so:
-mg + T + W_b = 0, or
T = mg - W_b
The buoyant force is equal in magnitude to the weight of the water that is displaced, only directed upward instead of downward. Can you get home from here?
2007-10-29 16:51:14 · answer #1 · answered by husoski 7 · 0⤊ 0⤋