The mass of 1 cm 3 of iron is 7.8 g, its density in S.I. unit is : 1. 7.8 kg/cm 3 2. 7.8 g cm -3 3. 7800 g/cm 3 4. 7800 kg/m 3

7800 kg/m 3 Reason Density = = g/cm 3 Converting g cm -3 into kg m -3 , We know, 1 g = 10 -3 kg 1 cm = 10 -2 m 1 cm 3 = 10 -6 m 3 Therefore, 7.8 = 7.8 = 7.8 = 7.8 x 1000 kg m -3 Hence, 7.8 g/cm 3 = 7800 kg/m 3

Physics

The mass of 1 cm³ of iron is 7.8 g, its density in S.I. unit is :
7.8 kg/cm³
7.8 g cm^-3
7800 g/cm³
7800 kg/m³

Fluids Upthrust

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Answer

7800 kg/m³

Reason —

Density = $\dfrac{\text{mass}}{\text{volume}}$ = $\dfrac{7.8}{1}$ g/cm³

Converting g cm^-3 into kg m^-3,

We know, 1 g = 10^-3 kg

1 cm = 10^-2 m

1 cm³ = 10^-6 m³

Therefore,

7.8 $\dfrac{\text {g}}{\text {cm}^3}$

= 7.8 $\dfrac{10^{-3}\text {kg}}{10^{-6} \text{m}^3}$

= 7.8 $\dfrac{10^{3}\text {kg}}{1 \text{m}^3}$

= 7.8 x 1000 kg m^-3

Hence,

7.8 g/cm³ = 7800 kg/m³

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Physics

The mass of 1 cm³ of iron is 7.8 g, its density in S.I. unit is :
7.8 kg/cm³
7.8 g cm^-3
7800 g/cm³
7800 kg/m³

Fluids Upthrust

Answer

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Physics

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Fluids Upthrust

Answer

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decreases with an increase in temperature
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first decreases then increases with a decrease in temperature
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The density of water is maximum at …………… °C and is …………… kg/m³
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mercury
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