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Ahat [919]
2 years ago
10

Alex is conducting an experiment to find the specific heat capacity of water. She finds that 90 kJ were needed to raise the temp

erature of 350 g of water from 25°C to 75°C. What equation should she use to calculate the specific heat capacity?
Physics
1 answer:
aksik [14]2 years ago
3 0

The equation that she will use to calculate the specific heat capacity is Q/(mΔθ).

<h3>What is specific heat capacity?</h3>

Specific heat capacity is the quantity of heat required to raise 1 kg unit mass by 1 kelvin temperature.

Q = mcΔθ

where;

  • Q is quantity of heat required
  • m is mass of the water
  • c is the specific heat capacity
  • Δθ is change in temperature = 75 - 25 = 50°C

c = Q/(mΔθ)

c = (90,000) / (350 x 50)

c = 5.143 J/g°C

Thus, the equation that she will use to calculate the specific heat capacity is Q/(mΔθ).

Learn more about specific heat capacity here: brainly.com/question/16559442

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Answer:

The force pulling the roller along the ground is 128.55 N

Explanation:

A force of 200 N acting at an angle of 50° with the ground level

This force is pulled a garden roller

We need to find the force pulling the roller along the ground

The force that pulling the roller along the ground is the horizontal

component of the force acting

→ The force acting is 200 N at direction 50° with ground (horizontal)

→ The horizontal component = F cosФ

→ F = 200 N , Ф = 50

→ The horizontal component = 200 cos(50) = 128.55 N

128.55 N is the horizontal component of the force that pulling the

roller along the ground

<em>The force pulling the roller along the ground is 128.55 N</em>

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Answer:

Explanation:

Answer:

Explanation:

The half life is the time taken for half of a radioactive substance to disintegrate.

The shorter the half life, the larger the decay constant and the faster the decay process.

For a very large half life, it would take a very long time for the radioactive nuclide to decay to half.

With each half life reached, a new set of daughter cell is formed. Atoms that have short half life would decay rapidly. Every radionuclide has its own characteristic half-life.

If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life. With this observation, we can hypothesise and conduct experiment to support the assertion that as the number of half-lives increases then the number of radioactive atoms decreases.

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