3 years ago

8th grade science help help

Physics

1 answer:

Maslowich3 years ago

7 0

Answer: A

Explanation:

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A ball is thrown upward at 4 meters per second starting from ground level. How long does it take for the ball to return to the g

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Answer:

it takes 2 min to return

Explanation:

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3 years ago

A honey bee flaps its wings 200 times per second. How much time is required for one wingbeat? Give your answer in milliseconds.

kakasveta [241]

A bees wings move so rapidly that studying them, even seeing them, has proved difficult.
The honeybees have a rapid wing beat honeybee flaps its wings 230 times every second.

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3 years ago

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What is the magnitude of an electric field that balances the weight of a plastic sphere of mass 2.1 g that has been charged to -

Liula [17]

Answer:

Electric field, $E=6.86\times 10^6\ N/C$

Explanation:

It is given that,

Mass of sphere, m = 2.1 g = 0.0021 kg

Charge, $q=-3\ nC=-3\times 10^{-9}\ C$

We need to find the magnitude of electric field that balances the weight of a plastic spheres. So,

$ma=qE$

a = g

$E=\dfrac{mg}{q}$

$E=\dfrac{0.0021\ kg\times 9.8\ m/s^2}{-3\times 10^{-9}\ C}$

$E=6860000\ N/C$

$E=6.86\times 10^6\ N/C$

Hence, the magnitude of electric field that balances its weight is $6.86\times 10^6\ N/C$ . Hence, this is the required solution.

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3 years ago

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bogdanovich [222]

Answer: understandable have a nice day

Explanation:

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3 years ago

What is the average total energy density in electromagnetic radiation that has an intensity of 475 W/m^2?

Andreas93 [3]

Answer:

1.6 x 10⁻⁶ J/m³

Explanation:

I = Intensity of electromagnetic radiation = 475 Wm⁻²

U = average total energy density of electromagnetic radiation

c = speed of electromagnetic radiation = 3 x 10⁸ m/s

Intensity of electromagnetic radiation is given as

$I = Uc$

Inserting the values

$475 = U (3\times 10^{8})$

U = 1.6 x 10⁻⁶ J/m³

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4 years ago