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elena-14-01-66 [18.8K]
3 years ago
8

Convection currents in air and water occur because _____. warm fluids are less dense than cold fluids cold fluids are less dense

than warm fluids the molecules of warm fluids bump into the molecules of cold fluids electromagnetic waves move the air or water
Physics
2 answers:
PtichkaEL [24]3 years ago
7 0

Answer: Option (a) is the correct answer.

Explanation:

A process in which a fluid (liquid or gas) whose cooler material (more dense) sinks at the bottom and warm material (less dense) rises at the top is known as convection process.

This intermixing of materials leads to the development of convectional currents.

Therefore, we can conclude that convection currents in air and water occur because warm fluids are less dense than cold fluids.

GrogVix [38]3 years ago
4 0
Warm fluids are less dense than cold fluids.
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Energy in motion is _____ energy. potential scientific kinetic
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kinetic energy

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If the radius of an atom is 60 pm and the radius of the Earth is 6000 km, by how many orders of
kherson [118]

Answer:

1 x 10¹⁷

               

Explanation:

Given data:

        Radius of the earth  = 6000km

        Radius of an atom  = 60pm

Now, how many orders is the radius of the earth larger than an atom

Solution:

To solve this problem, let us express both quantity as the same unit;

         1000m  = 1km

    6000km  = 6000 x 10³m   =  6 x 10⁶m

    60pm;

            1 x 10⁻¹²m  = 1pm

    60pm  = 60 x  1 x 10⁻¹²m  = 6 x 10⁻¹¹m

Now;

The order:   \frac{6 x 10^{6} }{6 x 10^{-11} }   = 1 x 10¹⁷

               

6 0
2 years ago
If a stone is dropped from a height of 400 feet, its height after t seconds is given by s = 400 − 16t2. Find its instantaneous v
soldier1979 [14.2K]

Answer:

v = -32 t

Explanation:

given,

s = 400- 16 t²

we know,

Velocity of an object is defined as the change in displacement per unit change in time.

velocity an also be return as

v = \dfrac{ds}{dt}

v = \dfrac{d}{dt}(400-16t^2)

v= 0 -2\times 16 t

v = -32 t

Hence, instantaneous velocity function given by v = -32 t

To calculate instantaneous velocity, you need to insert value of time.

ex, instantaneous velocity at t = 4 s

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A hypothetical planet has a mass of 1.66 times that of Earth, but the same radius. What is gravitiy near its surface?
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A certain parallel-plate capacitor is filled with a dielectric for which Κ = 5.5 .The area of each plate is 0.034 m2 , and the p
Nesterboy [21]

Answer:

The maximum energy that can be stored in the capacitor is  6.62 x 10⁻⁵ J

Explanation:

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E = ¹/₂ x 8.275 x 10⁻¹⁰ x (400)²

E = 6.62 x 10⁻⁵ J

Therefore, the maximum energy that can be stored in the capacitor is  6.62 x 10⁻⁵ J

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