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Calculate the volume of a cuboid, state 3 differences between a luminous and non-luminous flame, and calculate the density of a wooden block.

Physics

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1. Calculate the volume of a cuboid

  1. Identify the given dimensions and convert them to SI units (meters).

    Length (ll) =10 cm=10×0.01 m=0.1 m= 10 \text{ cm} = 10 \times 0.01 \text{ m} = 0.1 \text{ m}
    Width (ww) =4 cm=4×0.01 m=0.04 m= 4 \text{ cm} = 4 \times 0.01 \text{ m} = 0.04 \text{ m}
    Height (hh) =4 cm=4×0.01 m=0.04 m= 4 \text{ cm} = 4 \times 0.01 \text{ m} = 0.04 \text{ m}

  2. Calculate the volume using the formula V=l×w×hV = l \times w \times h.

    V=0.1 m×0.04 m×0.04 mV = 0.1 \text{ m} \times 0.04 \text{ m} \times 0.04 \text{ m} V=0.00016 m3V = 0.00016 \text{ m}^3

    The volume of the cuboid in SI units is: 0.00016 m3\boxed{0.00016 \text{ m}^3}

    2. State 3 differences between a luminous and non-luminous flame

    Here are three differences:

    • A luminous flame is yellow/orange in color, while a non-luminous flame is blue.
    • A luminous flame produces soot due to incomplete combustion, whereas a non-luminous flame is clean and produces no soot due to complete combustion.
    • A luminous flame is cooler, while a non-luminous flame is hotter.

    3. Calculate the density of a wooden block

  3. Identify the given mass and volume, then convert them to SI units.

    Mass (mm) =4 g=4×10−3 kg=0.004 kg= 4 \text{ g} = 4 \times 10^{-3} \text{ kg} = 0.004 \text{ kg}
    Volume (VV) =200 cm3=200×(10−2 m)3=200×10−6 m3=2×10−4 m3= 200 \text{ cm}^3 = 200 \times (10^{-2} \text{ m})^3 = 200 \times 10^{-6} \text{ m}^3 = 2 \times 10^{-4} \text{ m}^3

  4. Calculate the density using the formula ρ=mV\rho = \frac{m}{V}.

    ρ=0.004 kg2×10−4 m3\rho = \frac{0.004 \text{ kg}}{2 \times 10^{-4} \text{ m}^3} ρ=4×10−3 kg2×10−4 m3\rho = \frac{4 \times 10^{-3} \text{ kg}}{2 \times 10^{-4} \text{ m}^3} ρ=2×10(−3−(−4)) kg/m3\rho = 2 \times 10^{(-3 - (-4))} \text{ kg/m}^3 ρ=2×101 kg/m3\rho = 2 \times 10^{1} \text{ kg/m}^3 ρ=20 kg/m3\rho = 20 \text{ kg/m}^3

    The density of the wooden block in SI units is: 20 kg/m3\boxed{20 \text{ kg/m}^3}

    4. Draw and state the function of the following (a) Conical flask

    I cannot provide a drawing, but I can describe the function of a conical flask.

    A conical flask (also known as an Erlenmeyer flask) is a laboratory vessel with a flat bottom, a conical body, and a cylindrical neck. Its main functions include:

    • Holding and mixing liquids, especially during titrations, as its shape allows for swirling without spillage.
    • Heating liquids, as the narrow neck reduces solvent loss through evaporation.
    • Storing and culturing microorganisms.
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