Question 3
Density and UpthrustA test tube of radius 1.0cm is loaded to 8.8g. If it is placed upright in water, find the depth to which it would sink. [g = 10ms−2, density of water = 1000kgm−3]
- A.2.8cm
- B.5.2cm
- C.25.5cm
- D.28.0cm
Show the answer and explanation
Answer: A (2.8cm)
Explanation
It floats when it displaces 8.8 g of water, i.e. 8.8 cm3. πr2h = 8.8 with r = 1 cm gives h ≈ 2.8 cm.