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3 years ago

Which scientist first showed a clear connection between mechanical energy and heat?

1 answer:

5 0

James Prescott Joule first showed a clear connection between mechanical energy and heat

In short, Your Answer would be Option B

Hope this helps!

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Which of the following best describes a hypothesis?

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3 years ago

(MICROWAVE) Describe the device and its function.

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3 years ago

Give an example of a theory scientists believed for a long time that was eventually proved false

jolli1 [7]

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3 years ago

A 2.0-mm-diameter copper ball is charged to 40 nC . What fraction of its electrons have been removed? The density of copper is 8

murzikaleks [220]

Answer:

0.02442 × 10⁻⁹

Explanation:

Given:

Diameter of copper ball = 2.00 mm = 0.002 m

Charge on ball = 40 nC = 40 × 10⁻⁹ C

Density of copper = 8900 Kg/m³

Now,

The number of electrons removed, n = $\frac{\textup{Charge on ball}}{\textup{Charge of an electron}}$

also, charge on electron = 1.6 × 10⁻¹⁹ C

Thus,

n = $\frac{40\times10^{-9}}{1.6\times10^{-19}}$

n = 25 × 10¹⁰ Electrons

Now,

Mass of copper ball = volume × density

Mass of copper ball = $\frac{4}{3}\pi(\frac{d}{2})^3$ × 8900

Mass of copper ball = $\frac{4}{3}\pi(\frac{0.002}{2})^3$ × 8900

Mass of copper ball = 0.03726 grams

Also,

molar mass of copper = 63.546 g/mol

Therefore,

Number of mol of copper in 0.03726 grams = $\frac{ 0.03726}{63.546}$

Number of mol of copper in 0.03726 grams = 5.86 × 10⁻⁴ mol

and,

1 mol of a substance contains = 6.022 × 10²³ atoms

Therefore,

5.86 × 10⁻⁴ mol of copper contains = 5.86 × 10⁻⁴ × 6.022 × 10²³ atoms.

5.86 × 10⁻⁴ mol of copper contains = 35.88 × 10¹⁹ atoms

Now,

A neutral copper atom has 29 electrons.

Therefore,

Number of electrons in ball = 29 × 35.88 × 10¹⁹ = 1023.37 × 10¹⁹ electrons.

Hence,

The fraction of electrons removed = $\frac{25\times10^{10}}{1023.37\times10^{19}}$

The fraction of electrons removed = 0.02442 × 10⁻⁹

3 0

3 years ago