A man travels 8,000 meters in 20 mins how fast is he going

1 answer:

5 0

Speed = 8000m/20min = 400m/min

Convert meters/min to meters/second.
60seconds in 1minute:
400m/60sec = 6.67m/s

Speed is: 6.67m/s

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During which step of the scientific method does a scientist make an educated

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Answer:

form a hypothesis

Explanation:

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3 years ago

Two large metal plates of area 0.7 m2 face each other. They are 5.1 cm apart and have equal but opposite charges on their inner

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Explanation:

The given data is as follows.

Area (A) = 0.7 $m^{2}$ .

Electric field between the plates, (E) = 55 N/C

Since, electric field is related to surface charge density as follows.

$\sigma = \frac{Q}{A}$

Also, E = $\frac{\sigma}{\epsilon_{o}}$

or, $\sigma = \epsilon_{o} E$

Therefore, charge will be calculated as follows.

Q = $\sigma \times A = \epsilon_{o} E \times A$

= $8.854 \times 10^{-12} \times 55 \times 0.7$

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Thus, we can conclude that magnitude of the charge on each plate is 341 pC.

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4 years ago

Is there any change in mass of substance after it changes its state? Explain with an example

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Answer:

Explanation:

When a substance changes its state , there will not be any change in the mass of substance . For example , if we change 100 grams of water (liquid) to ice(solid) , the mass of ice will be same i.e., 100 grams . This shows there is no change in the mass even if a substance changes its state.

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2 years ago

A copper sphere was moving at 25 m/s when it hit another object. this caused all of the ke to be converted into thermal energy f

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ΔT= 81°C was the increase in temperature.

<h3>steps</h3>

As evidenced by energy conservation

To increase its temperature, all of its kinetic energy will be converted to thermal energy.

$\frac{1}{2}mv ^{2} = ms$ ΔT