In lab you find that a 1-kg rocksuspended above water wights 10 N. when the rock

Question

In lab you find that a 1-kg rocksuspended above water wights 10 N. when the rock issuspended beneath the surface of the water , the scale reads8N. a. what is the buoyant force on the rock?
b. if the container of water wights 10 N on the weightingscale, what is the scale reading when the rock suspending beneaththe surface of the water?
c. what is the scale reading when the rock is released andrest at the bottom of the container? In lab you find that a 1-kg rocksuspended above water wights 10 N. when the rock issuspended beneath the surface of the water , the scale reads8N. a. what is the buoyant force on the rock?
b. if the container of water wights 10 N on the weightingscale, what is the scale reading when the rock suspending beneaththe surface of the water?
c. what is the scale reading when the rock is released andrest at the bottom of the container?

Explanation / Answer

The bouyancy force is a force which acts upwards: The bouyantforce on a body immersed in a fluid is equal to the weigth of thefluid displaced by that object A: Fb = 8 N, because the bouyancy force is equal to the weigth of thefluid displaces by the rock. In this case, the rock is "floating"on water which is impossible. B: do not understand the question C: The rock is in water, so the bouyancy force is: Fb = Vg = mg = 1.0 * 9.81 The density of the rock is greater then that of water. Therefore,the rock sinks. This means that the rock displaces a mass of waterof 10 N

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