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3 years ago

6

Chemicals in the air can combine with rain to produce acid rain, which is harmful to the environment. Which of these is most lik

ely to be the pH of acid rain?

1 answer:

irinina [24]3 years ago

7 0

Hi there!

Normal rain has a pH between 5.0 and 5.5, which is slightly acidic on the pH scale. Acid rain on the other hand has an average pH of 4.0, much more acidic than your average rain.

Therefore, the most likely pH of acid rain would be 4.0.

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dezoksy [38]

Answer:

Both particle and wave properties

Explanation:

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Experiments performed with light indicate that light exhibits both particle and wave properties.

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3 years ago

Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 708-k

Varvara68 [4.7K]

Answer:

a) $I=646.9298\ A$

b) $I=1942.018\ A$

Explanation:

Given:

efficiency of the motor, $\eta=0.95$

voltage of the battery, $V=12\ V$

mass of the car, $m=708\ kg$

a)

initial velocity, $u=0\ m.s^{-1}$

final velocity, $v=25\ m.s^{-1}$

time taken for the acceleration, $t=1\ min=60\ s$

Now we know by the Newton's second law of motion:

$F=m.a$

$F=708\times \frac{(25-0)}{60}$

$F=295\ N$

Now the power will be :

$P=F.v$

$P=295\times 25$

$P=7375\ W$

<u>According to the question:</u>

0.95 times of the electrical power should yield this mechanical power.

$P=V.I\times 0.95$

$7375=12\times I\times 0.95$

$I=\frac{7375}{12\times 0.95}$

$I=646.9298\ A$

b)

height climbed by the car, $h=200\ m$

velocity of climb, $v=25\ m.s^{-1}$

time taken to climb the height, $t=2\ min=120\ s$

force exerted to overcome air and frictional resistances, $f=423\ N$

Now the Power required to climb the hill:

$P=\frac{m.g.h}{t} +f\times v$

$P=\frac{708\times 9.8\times 200}{120}+423\times 25$

$P=22139\ W$

<u>Now according to the electrical efficiency:</u>

$P=V.I\times 0.95$

$22139=12\times I\times 0.95$

$I=1942.018\ A$

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