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Sidana [21]
3 years ago
7

How do i explain to kids how much water on earth is drinkable?

Physics
1 answer:
Sergio [31]3 years ago
5 0
3% of water on earth is fresh water and 2.4% of that is permanently frozen in glaciers 
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A length of copper wire has a resistance 44 Ω. The wire is cut into three pieces of equal length, which are then connected as pa
WINSTONCH [101]

Answer:

\frac{R}{1} = \frac{44}{9}\ohm

Explanation:

Let us imagine that there are three wire of length equal length having equal resistances each of 44/3 Ω

Now connect these wires in parallel to so that their equivalent resistance is R.

then

\frac{1}{R} = \frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}

\frac{1}{R} = \frac{3}{44}+\frac{3}{44}+\frac{3}{44}

\frac{1}{R} = \frac{9}{44}

⇒\frac{R}{1} = \frac{44}{9}\ohm

5 0
2 years ago
Read 2 more answers
A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of th
Blababa [14]
Efficiency = (Wanted) energy out ÷ energy in × 100

Energy in = 400J
Wanted Energy out = 240J

Energy cannot be used up, only transferred, so the remaining energy is most likely to be transferred into unwanted energy (loss of energy) such as heat energy.

Efficiency = 240 ÷ 400 × 100
Efficiency = 0.6 × 100
Efficiency = 60%
8 0
3 years ago
Define unit aland how many types of unit are there . Name them?​
Lana71 [14]

Answer:

7. They arethe meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd)

Explanation:

7. They arethe meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd)

4 0
2 years ago
the strength s of a rectangular wooden beam is proportional to its width and the cube of is septh. If the beam is to be cut from
babymother [125]

Answer:

Can see it in the pic

Explanation:

Can see it in the pic

4 0
3 years ago
What is the process called when the moon begins to fade from a full moon to the new moon?
nataly862011 [7]
Waning is what it’s called
8 0
3 years ago
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