Question 3
Density and UpthrustA heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because
- A.the density of water is less than that of the object
- B.the pressure is low just below the water surface
- C.it experiences an upthrust
- D.the tension in the string neutralizes part of the weight.
Show the answer and explanation
Answer: C (it experiences an upthrust)
Explanation
The water pushes up on the object with an upthrust equal to the weight of water displaced, so less tension is needed to hold it.