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3 years ago

What is necessary for a convection cell to be set up in a fluid?

Physics

2 answers:

disa [49]3 years ago

6 0

Answer:

Option (C)

Explanation:

In order to generate convection cells, the fluid must be of extremely high temperature and low density.

The lower part of the fluid when heated, the temperature increases significantly, as a result of which it expands. Due to this, it becomes less dense, and tends to rise up towards the surface. This rising fluid when reaches the surface, its temperature eventually decreases. It then becomes denser and subsequently sinks to the bottom. This is how the cycle repeats, forming the convection cells in the fluid.

Thus, both the thermal gradient as well as density is responsible for the formation of convection cells in a fluid.

Hence, the correct answer is option (C).

Vitek1552 [10]3 years ago

3 0

Convection cells don't work in solids.

In order for convection to happen, material with some temperature and density has to FLOW to a place where the material there has a different temperature and density.

Material doesn't FLOW in solids, only in FLuids.

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How does the amount of resistors affect the current in a series circuit

Yuki888 [10]

The current in a series circuit decreases as the TOTAL RESISTANCE increases. Resistors come in many values, so the total resistance has nothing to do with the number of resistors. There could easily be one single resistor with greater resistance than 500 resistors with smaller values.

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3 years ago

A rocket weighs 1.000. N on the surface of Earth. What is its weight at a distance of two Earth radii above the

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3 years ago

A ruby laser delivers a 16.0-ns pulse of 4.20-MW average power. If the photons have a wavelength of 694.3 nm, how many are conta

stepan [7]

Answer:

The value is $n = 2.347 *10^{17} \ photons$

Explanation:

From the question we are told that

The amount of power delivered is $P = 4.20 \ M W = 4.20 *10^{6} \ W$

The time taken is $t = 16.0ns = 16.0 *10^{-9} \ s$

The wavelength is $\lambda = 694.3 \ nm = 694.3 *10^{-9} \ m$

Generally the energy delivered is mathematically represented as

$E = P * t = \frac{n * h * c }{\lambda }$

Where $h$ is the Planck's constant with value $h = 6.262 *10^{-34} \ J \cdot s$

c is the speed of light with value $c = 3.0*10^{8} \ m/s$

$4.20 *10^{6} * 16*10^{-9}= \frac{n * 6.626 *10^{-34} * 3.0*10^{8} }{694.3 *10^{-9}}$

=> $n = 2.347 *10^{17} \ photons$

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3 years ago

A punter wants to kick a football so that the football has a total flight time of 3.7 s and lands 56m away (measured along the g

Irina18 [472]

The maximum height is 16.8 m

Explanation:

In order to find the maximum height reached by the football, we can just analyze its vertical motion.

The vertical motion of the ball is a free fall motion, affected only by the force of gravity. So it is a uniformly accelerated motion, and we can use suvat equations.

First of all, we notice that the motion of the ball is symmetrical, so the time taken to reach the maximum height is equal to the time needed to fall down: Since the total time of flight is

T = 3.7 s

It means that the time to reach the maximum height is

$t=\frac{T}{2}=\frac{3.7}{2}=1.85 s$