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mariarad [96]
3 years ago
11

For hundreds of years humans have been adding chemicals and other pollutants to the earths water supply. Can earths water ever b

e clean and pure again? What is clean and pure water?
Physics
1 answer:
AfilCa [17]3 years ago
7 0
Pure water is a colorless, odorless liquid with no molecules
except H₂O in it.  You can buy it at the supermarket, or make
it at home if you have the equipment and know how to use it.
At the supermarket, it's sold in gallon jugs, marked "Distilled
Water".

It turns out that pure water tastes bleah, and you would not
want to drink it for very long.

The Earth's water cycle is constantly purifying our water.
When the sun warms the ocean's surface and evaporates
water, what evaporates and rises into the atmosphere is
pure water.  The pollutants don't evaporate.  The clouds,
the rain, and the rivers are self-purifying.  Another example
of a process of nature that makes life possible here.

The junk is collecting in the oceans.  We're lucky that the oceans
have such huge volume that we haven't been able to significantly
pollute that entire layer of the Earth and kill off all sea life yet. 
But we're working on it.

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Elenna [48]

Answer:

1. Sports education-uses seasons and teams to educate

2. Adventure education-uses challenging recreational activities

3. Outdoor education-may use camps to teach activities

4. Dance education-uses cultural movement activities

5. fitness education-teaches concepts and self-management skills

Explanation:

I figured that these answers made the most sense so ya.

3 0
3 years ago
An object with little mass won't require a lot of force to move.
Anna35 [415]

Answer:

True

Explanation:

Heavier objects (objects with more mass) are more difficult to move and stop. Heavier objects (greater mass) resist change more than lighter objects. Example: Pushing a bicycle or a Cadillac, or stopping them once moving. The more massive the object (more inertia) the harder it is to start or stop.

7 0
2 years ago
A hot air balloon is hovering in the air when it drops a 40 Kg food package to some lost golfers. If the package is dropped from
UNO [17]
We can calculate this with the law of conservation of energy. Here we have a food package with a mass m=40 kg, that is in the height h=500 m and all of it's energy is potential. When it is dropped, it's potential energy gets converted into kinetic energy. So we can say that its kinetic and potential energy are equal, because we are neglecting air resistance:

Ek=Ep, where Ek=(1/2)*m*v² and Ep=m*g*h, where m is the mass of the body, g=9.81 m/s² and h is the height of the body.

(1/2)*m*v²=m*g*h, masses cancel out and we get:

(1/2)*v²=g*h, and we multiply by 2 both sides of the equation

v²=2*g*h, and we take the square root to get v:

v=√(2*g*h)

v=99.04 m/s

So the package is moving with the speed of v= 99.04 m/s when it hits the ground. 
5 0
3 years ago
A 6.89-nC charge is located 1.76 m from a 4.10-nC point charge. (a) Find the magnitude of the electrostatic force that one charg
iogann1982 [59]

Answer: a) 8.2 * 10^-8 N or 82 nN and b) is repulsive

Explanation: To solve this problem we have to use the Coulomb force for two point charged, it is given by:

F=\frac{k*q1*q2}{d^{2}}

Replacing the dat we obtain F=82 nN.

The force is repulsive because the points charged have the same sign.

5 0
3 years ago
What is the equivalent resistance between terminals A and B, measured in ohms?
Usimov [2.4K]

Answer:

c. 0.80

Explanation:

they will choose the path that has not resistance

8 0
2 years ago
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