NCERT Solutions for Class 9 Science Chapter 10
Important NCERT Questions
Gravitation
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-145
Questions No-21
The volume of 50 g of a substance is 20 cm^3. If the density of water is 1 g cm^–3, will the substance float or sink?
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To determine whether the substance will float or sink in water, we need to compare the density of the substance with the density of water.
Given:
– Mass of the substance = 50 g
– Volume of the substance = 20 cm³
– Density of water = 1 g/cm³
The density of a substance is calculated using the formula: Density = Mass / Volume
For the substance:
Density = Mass / Volume = 50 g / 20 cm³ = 2.5 g/cm³
Comparing the density of the substance (2.5 g/cm³) with the density of water (1 g/cm³):
– The density of the substance (2.5 g/cm³) is greater than the density of water (1 g/cm³).
Since the density of the substance is greater than the density of water, the substance will sink in water.