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3 years ago

On a hot summer day, heat waves can be seen rising from the asphalt. What type of heat transfer do the heat waves demonstrate?

1 answer:

4 0

What you see rising from the road ... and call "heat waves" ...
are rising currents of air. The air that's been heated by
contact with the hot asphalt rises. (Why ? By being heated,
it becomes less dense than the other air around it, and the
buoyant force of being a less dense substance in a more dense
fluid makes it rise (float) ).

If we want to paint a complete picture, we can find all three
types of heat transfer going on here:

1). The air getting heated by direct contact with the hot road ==> conduction

2). The hot air rising through the cooler air around it ==> convection

3). How the road got so hot in the first place ==> radiation, from the sun

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In what ways would organisms living in very deep water need to be specialized?

Nady [450]

Organisms living in great depths of water bodies like oceans and lakes need to be adapted for two (2) things especially; high water pressure and vision in darkness

The water column above from deep in the water can cause lots of hydrostatic pressure on the organisms’ cells. Also the fact that light cannot penetrate to great depth of water due to diffusion means the organisms must live in darkness.

Explanation:

It has been shown that cells from Piezophile bacteria have a high percentage of fatty acids in their membranes to prevent the cells from compacting solid from the high pressure.

Most of the organisms are also detritivores and use chemosynthesis for the autotrophs because light cannot reach these depths and hence photosynthesis is not possible. Organisms with eye vision are adapted to high wavelength light that can at least reach greater depths before diffusing. Nonetheless natural selection would favour use of sight for most organisms in this benthic region.

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4 years ago

Estimate the monthly cost of using a 700-W refrigerator that runs for 10 h a day if the cost per kWh is $0.20.

slamgirl [31]

Power consumed by the refrigerator is given as

$P = 700 W$

Now if refrigerator is used 10 h a day then total usage of refrigerator for 1 month will be given as

$t = 10 * 30 = 300 h$

now the total energy consumed in one month is given as

$E = P * t$

$E = 700 * 300$

$E = 210000$

$E = 210 kWh$

now it is given that cost of one kWh is $0.20

then total cost of one month is given as

$C = $0.20 * 210$

$C = $42$

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3 years ago

A charged particle decelerates as it moves from location a to location b. if va = 160 v and vb = 100 v, what is the sign of the

skelet666 [1.2K]

The sign of the charged particle is positively charged.

<h3>What is potential difference?</h3>

When a single charge is transported in an electric field, work is done by the potential difference (also known as electrical potential).
There is potential energy stored in this charge that could flow when work is done on it.
Voltage is the possibility of a single charge flowing. The need to flow increases with voltage.
Here, voltage can be the potential differences.

The potential difference between the 2 points determines the movement of that particle. An electron moves from lower to higher potential which is negatively charged, and a positively charged particle moves from higher to lower potential.

Now, since the particle is moving from a point A having 160 v potential to point B having 100 v potential that is it is moving from higher potential to a lower potential therefore the particle will be a positively charged one.

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1 year ago

Select the option that best completes the statement: In the absence of a net force, an object can be It is not possible to know

victus00 [196]

In the absence of a net force, an object can be at rest or in motion with a constant velocity.

<h3>What is Newton's first law of motion?</h3>

Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that path <u>unless acted upon</u> by an external force.

This law is also called the law of inertia because it depends on mass.

F(net) = ma

when, F(net) = 0, acceleration will be zero and velocity will be constant.

Thus, in the absence of a net force, an object can be at rest or in motion with a constant velocity.

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2 years ago

Define in importance of building stores

Jobisdone [24]

The building sector plays a large role in the energy consumption which includes space heating or cooling, domestic hot water and electricity. Buildings with their long lifespan and huge amount of already existing buildings, makes revision in energy characteristics of a building constrained.

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3 years ago