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Which of the following elements is a metal? A. Carbon B. Copper C. Helium D. Krypton

Physics

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Step-by-step solution

3 steps
  1. To determine the density of mercury, we use the formula for relative density.

  1. Recall the formula for relative density.

    $$
\text{Relative density} = \frac{\text{Density of substance}}{\text{Density of water}}
$$

  2. Rearrange the formula to solve for the density of mercury and substitute the given values.

    $$
\text{Density of mercury} = \text{Relative density of mercury} \times \text{Density of water}
$$
$$
\text{Density of mercury} = 13.6 \times (1.0 \times 10^3 \text{ kg m}^{-3})
$$
$$
\text{Density of mercury} = 13.6 \times 1000 \text{ kg m}^{-3}
$$
$$
\text{Density of mercury} = 13600 \text{ kg m}^{-3}
$$

  3. Compare the calculated density with the given options.

    The calculated density matches option A.

The final answer is $\boxed{\text{A. } 13600 \text{ kg m}^{-3}}$.

    2. Runners are horizontal stems that grow along the ground, producing new plants at their nodes. Among the given options, sweet potato plants produce long, trailing vines that can root at the nodes, which is characteristic of runners.

    The final answer is $\boxed{\text{B. sweet potato}}$.

    3. Percussion instruments are those that produce sound when struck, shaken, or scraped. - Cymbals are struck, making them percussion instruments. - Violins are string instruments played with a bow, not percussion. - Gong gong (a type of gong) is struck, making it a percussion instrument. Therefore, Cymbals (I) and Gong gong (III) are percussion instruments.

    The final answer is $\boxed{\text{B. I and III only}}$.

    4. Thrombocytes, also known as platelets, are cell fragments essential for blood clotting. They are produced in the bone marrow from large cells called megakaryocytes.

    The final answer is $\boxed{\text{A. bone marrow}}$.
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