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3 years ago

9

What energy transformation do batteries perform?

2 answers:

Hitman42 [59]3 years ago

6 0

Answer:

B) chemical --> electrical

Explanation:

Chemicals are stored in batteries with led metal to give positive and negative charges which produce electricity when the circuit of the battery is closed

zalisa [80]3 years ago

4 0

Answer: Option B) chemical --> electrical

Explanation:

Batteries convert their stored chemical energy into electrical energy in order to power appliances.

So, the conversion of chemical energy to electrical energy explains how energy is conserved in nature, such that energy is neither created nor destroyed.

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What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is 5.66 0.09 m?

iren2701 [21]

Answer:

4.77 %

Explanation:

We know that the volume V for a sphere of radius r is

$V(r) = \frac{4}{3} \ \pi \ r^3$

If we got an uncertainty $\Delta r$ the formula for the uncertainty of V is:

$\Delta V(r) = \sqrt{ (\frac{dV}{dr} \Delta r)^2 }$

We can calculate this uncertainty, first we obtain the derivative:

$\frac{dV}{dr} = 3 * \frac{4}{3} \ \pi \ r^2$

$\frac{dV}{dr} = 4 \ \pi \ r^2$

And using it in the formula:

$\Delta V(r) = \sqrt{ (4 \ \pi \ r^2\Delta r)^2 }$

$\Delta V(r) = \sqrt{ 4^2 \ \pi^2 \ r^4 \Delta r^2 }$

$\Delta V(r) = 4 \ \pi \ r^2 \Delta r$

The relative uncertainty is:

$\frac{\Delta V(r)}{V(r)}$

$\frac{ 4 \ \pi \ r^2 \Delta r }{ \frac{4}{3} \ \pi \ r^3}$

$\frac{ 3 \Delta r }{ r}$

Using the values for the problem:

$\frac{ 3 * 0.09 m }{ 5.66 m} = 0.0477$

This is, a percent uncertainty of 4.77 %

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3 years ago

99 percent of the earth's atmosphere by mass is made up of only elements. These elements are

Alja [10]

99% of the earth´s atmosphere by mass is made up of only these elements: Nitrogen and oxygen.

Answer: B) Nitrogen and oxygen.

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lesya692 [45]

I think the answer is C

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alekssr [168]

D. Power. The unit of power is watt.

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Molodets [167]

Answer:

Metals, nonmetals and metalloids.

Explanation:

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