The discussion revolves around the force exerted by a boulder weighing 20,000 N in a tank with a volume of 0.4 m³. Participants explore the relationship between weight, force, and buoyancy in this context.
There is an active exploration of concepts related to buoyancy and force. Some participants have proposed calculations involving buoyant force, while others are verifying the reasoning behind these calculations. No consensus has been reached on the final answer.
Participants mention the need for the density of water and discuss the implications of buoyancy in the context of the problem. The discussion reflects uncertainty regarding the correct approach to determining the force exerted by the boulder in the tank.
Weight is a force of attraction due to gravity, yes.kuhatelyn said:I know the weight of the boulder is 20,000 N and the volume is 0.4 m^3
Wouldn't the answer just be 20,000? Since the force is the same thing as weight?
the options are:
(a) 12,460
(b) 17,860
(c) 16,080
(d) 14,450
(e) none of these
No. What effect does surrounding the boulder with water have?kuhatelyn said:Wouldn't the answer just be 20,000? Since the force is the same thing as weight?
Doc Al said:No. What effect does surrounding the boulder with water have?
Exactly.kuhatelyn said:Oohhh, so I would calculate the buoyant force and then subtract that from the weight of the boulder, so I get the force that the boulder exerts on the ground?
Looks good to me.If I multiply volume x density of water x force of gravity:
0.4 x 1000 x 9.8 = 3920
and then subtract this from 20,000 I get 16080.
Is that right?