Two double bonds means that the total number of electrons being shared in the molecule is
1 answer:
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The quantity with units of length only is
Explanation:
We have to combine the following constants:
- , Planck constant, with units
- G, the Newton's gravitational constant, with units
- , the speed of light, with units
The combination of these constant should have units of length only, so with meters (m).
First, we notice that has [kg] in its units, while G has
in its units, so in order to make the [kg] disappear, we have to multiply them and they should have same power, so:
Now we have to make the seconds, [s], disappear. We do that by dividing the new quantity by , so that the new units are:
We are almost done: now the quantity has units of an area, squared meters. Therefore, in order to make it have it units of length, we just take its square root:
Learn more about gravitational constant:
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Answer:
(a) 86.65 J
(b) 149.65 J
Solution:
As per the question:
Diameter of the pool, d = 12 m
⇒ Radius of the pool, r = 6 m
Height of the pool, H = 3 m
Depth of the pool, D = 2.5 m
Density of water,
Acceleration due to gravity, g =
Now,
(a) Work done in pumping all the water:
Average height of the pool, h =
h =
Volume of water in the pool, V =
Mass of water,
Work done is given by the potential energy of the water as:
(b) Work done to pump all the water through an outlet of 2 m:
Now,
Height, h = 2.75 + 2 = 4.75
Work done,