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3 years ago

How can you cause a substance to turn from a solid to a liquid or from a liquid to a gas? Help

Physics

1 answer:

Katyanochek1 [597]3 years ago

5 0

Answer:

When the temperature increases

Explanation:

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An electric vehicle starts from rest and accelerates at a rate a1 in a straight line until it reaches a speed of v. The vehicle

levacccp [35]

(a) $t=\frac{v}{a_1}+\frac{v}{a_2}$

In the first part of the motion, the car accelerates at rate $a_1$ , so the final velocity after a time t is:

$v = u +a_1t$

Since it starts from rest,

u = 0

So the previous equation is

$v= a_1 t$

So the time taken for this part of the motion is

$t_1=\frac{v}{a_1}$ (1)

In the second part of the motion, the car decelerates at rate $a_2$ , until it reaches a final velocity of v2 = 0. The equation for the velocity is now

$v_2 = v - a_2 t$

where v is the final velocity of the first part of the motion.

Re-arranging the equation,

$t_2=\frac{v}{a_2}$ (2)

So the total time taken for the trip is

$t=\frac{v}{a_1}+\frac{v}{a_2}$

(b) $d=\frac{v^2}{2a_1}+\frac{v^2}{2a_2}$

In the first part of the motion, the distance travelled by the car is

$d_1 = u t_1 + \frac{1}{2}a_1 t_1^2$

Substituting u = 0 and $t_1=\frac{v}{a_1}$ (1), we find

$d_1 = \frac{1}{2}a_1 \frac{v^2}{a_1^2} = \frac{v^2}{2a_1}$

In the second part of the motion, the distance travelled is

$d_2 = v t_2 - \frac{1}{2}a_2 t_2^2$

Substituting $t_2=\frac{v}{a_2}$ (2), we find

$d_1 = \frac{v^2}{a_2} - \frac{1}{2} \frac{v^2}{a_2} = \frac{v^2}{2a_2}$

So the total distance travelled is

$d= d_1 +d_2 = \frac{v^2}{2a_1}+\frac{v^2}{2a_2}$

7 0

3 years ago

13. Which shows a magnified, real image?<br><br> A <br> B <br> C

torisob [31]

Maybe c but I’m not sure

3 0

3 years ago

If you were to stir salt in water until the salt disappeared, which is the solute?

emmainna [20.7K]

Salt is the solute in that situation

6 0

3 years ago

Read 2 more answers

Charges may be blocked by:

stiks02 [169]

If the conductor isn't working it would be blocked

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3 years ago

Are wind-driven currents found near the surface of the oceans or in the deep waters of the ocean?

drek231 [11]

Wind-driven currents are found NEAR THE SURFACE of the oceans

Explanation:

Surface currents are at the interphase between the hydrosphere and atmosphere. Therefore the feel the greatest effect of drag by wind currents, especially prevailing winds (that blow predominantly in one direction like westerlies and easterlies) within the lower atmosphere. The deep currents, on the other hand, are more influenced by Coriolis effect of the earth’s rotation. It is these differences in influences of surface and deeper currents that cause Ekman transport in oceans.

Learn More:

For more on surface and deep ocean currents check out;

brainly.com/question/3552427

brainly.com/question/3008799

brainly.com/question/3700721

brainly.com/question/11975138

brainly.com/question/2804873

#LearnWithBrainly

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4 years ago