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3 years ago

Convection currents form when warm air rises and cold air sinks. What causes the warm air to rise and the cold air to sink?

Physics

2 answers:

irina1246 [14]3 years ago

5 0

Answer:

The diference in density

Explanation:

astraxan [27]3 years ago

4 0

The warm air rises, because it has become less dense as a result of increase in temperature from heating. Since it is heated, it expands and becomes less dense and such it rises.

The cold air, as result of decrease in temperature contracts, and becomes denser. The cold air is denser than the warm air. The cold air, being the denser sinks. So the cold air sinks because it is denser and heavier than warm air.

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Explain the difference between the degree measure of an arc and its arc length ...?

denis23 [38]

<span>The degree measure tells you how many degrees around a circle it goes; its length is how long it would be if straightened out. Like all semicircles have degree measure 180 no matter how big the circle they came from is.</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

8 0

3 years ago

At a playground, a child slides down a slide that makes a 42° angle with the horizontal direction. The coefficient of kinetic fr

kumpel [21]

Answer:

$a = 5.1\ m/s^2$

Explanation:

Given,

The angle of the slide= $42^\circ$

The mass of the child is= m

coefficient of friction = 0.20

when she slides down now apply Newton's law

$ma =mg \sin\theta - f$

$ma = mg\sin \theta -\mu mg \cos \theta$

therefore the acceleration

$a=g \sin\theta -\mu gcos\theta$

$a=g[\sin \theta -\mu \cos \theta]$

$a=9.8\times [\sin 42^\circ -0.2\times \cos 42^\circ]$

$a = 5.1\ m/s^2$

hence, the magnitude of acceleration during her sliding is equal to $a = 5.1\ m/s^2$

4 0

4 years ago

What is the current drawn if the voltage is 9V and resistance is 1.5 ohms ?

zhuklara [117]

Ohm's Law => V = I/R where
V stands for voltage,
I stands for Current
R stands for resistance.

ATQ
we know V = 9 volts
and R = 1.5 ohm's
so we need to find I.

Lets modify our formula little bit
we know V = IR which we can write as I = V/R
so lets substitute the values in the formula.
I = 9/1.5
I = 6 A

Correct Option is A.

8 0

4 years ago

Read 2 more answers

If a man weighs 900 n on the earth, what would he weigh on jupiter, where the acceleration due to gravity is 25.9 m/s2?

balandron [24]

<span>So, if the man weight 900 newtons on Earth then that means, using F=ma, that the mass of the man is approximately 91.84 kg. This is because 900N=m(9.8m/s^2), and so it follows that 900/9.8=91.84. Using the man's found mass we then plug this into F=ma again. It follows that F=(91.84)(25.9)=2378.57N. This means that the man "weighs" 2378.57 Newtons on Jupiter, or about 2.5x as great as his weight on Earth. This makes sense, considering that 25.9/9.8 is approximately equal to 2.64.</span>

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4 years ago

Why might scientists conduct multiple trial experiments rather than rely on a single trial?

Delvig [45]

Scientists conduct multiple trial experiments because one test might not be as reliable as multiple trials. Another reason they conduct multiple trials is because the scientific method says to conduct multiple experimental tests.

7 0

3 years ago