Question

A beaker of water is sitting on a sensitive spring scale. If you dip your finger into the water, but do not touch the side of the beaker, and the beaker does not overflow, what happens to the reading of the scale? (part of your finger is completely underwater. ) 1. It depends on just how much of your finger is submerged. Unless we are told, we can't answer. 2. The reading of the scale increases because of the extra pressure. 3. The reading of the scale remains precisely the same, of course. 4. It depends on how deep the water is. In some cases, the scale reading might increase, in other cases it might decrease. 5. The reading of the scale decreases

Answer 1

The reading of the scale will increase.

Our fingers push away the water in the cup which requires a lot of force. The scale should apply the same force to your finger. This force increases the reading on the scale. The scale display will rise. When a finger is submerged, the water exerts an upward buoyant force on the finger.

According to Newton's third law fingers exert equal and opposite forces on water. The spring scale reading decreases until the object is completely submerged. The reading, therefore, shows the apparent weight of the stone, which is less than its actual weight. Heavy metals are denser than water and will sink in water, so putting heavy metals in water will change the reading on the spring scale.

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