4. Place a pin at a distance of about 5 cm from the magnet .Observe what happens. Is the magnet able to attract the pin?
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Ответ:
Density of a substance is defined as the mass occupied by the substance per unit volume. Mathematically it can be expressed as:
Density = Mass/Volume
i.e. ρ = m/V
In SI units, the mass is expressed in kilograms (kg) and the volume in cubic meters (m3). Thus,
Density = kg/m3
SI units for density = kg/m3