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The density of air is 1.293 kg /m^3. Exp...

The density of air is 1.293 kg /`m^3`. Express it in cgs units.

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Chromium is added to steel to impart strength and shine. If the density of chromium is 7.19 g//cm^(3) . Express in SI unit (kg//m^(3)) .

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Knowledge Check

  • The intensity of a plane progressive wave of frequency 1000 Hz is 10^(-10) Wm^(-2) . Given that the speed of sound is 330 m//s and density of air is 1.293 kg//m^(3) . Then the maximum change in pressure in N//m^(2) is

    A
    `3 xx 10^(-4)`
    B
    `3 xx 10^(-5)`
    C
    `3 xx 10^(-3)`
    D
    `3 xx 10^(-2)`

  • A balloon inflated with helium gas (density = 0.2 kg//m^(3) ) has a volume of 6 xx 10^(-3) m^(3) . If the density of air is 1.3 kg//m^(3) . What is the buoyant force exerted on the balloon ?

    A
    `0.01 `N
    B
    `0.8 ` N
    C
    `0.08 N`
    D
    `1.3` N

  • A rain drop with radius 1.5 mm falls from a cloud at a height 1200 m from ground. The density of water is 1000 kg/m^(3) and density of air is 1.2 kg/m^(3) . Assume the drop was spherical throughout the fall and there is no air drag. The impact speed of the drop will be:

    A
    `27 km/h`
    B
    `550 km/h`
    C
    Zero
    D
    `129 km/h`

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    Vanadium metal is added to steel to impart strength. The density of vanadium is 5.96g//cm^(3) . Express this in S.I units (kg//m^(3)) .

    By using (i) Newton's formula and (ii) Laplace's formula, calculate the speed of sound in air at standard pressure and temperature. The density of air is 1.293 kg//m^(3) . gamma = 1.4 for air.

    Given the density of air is 1.29 kg m^(-3) . Then, the relative density of air is ________.

    The density of air at NTP is 1.293kgm^(-3) . Calculate its density when its temperature is 16.6^(@)C and pressure is 75cm of mercury.

    Density of an object is g//cm^(3) . Express it in kg//m^(3) .

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