Answer:
18,375 kJ
Explanation:
Parameters given:
Density of water: 1000 kg/m³
Acceleration due to gravity = 9.8 m/s²
Dimensions of pool = 30m × 10m × 2.5m
Depth of pool = 2.5 m
First we need to find the mass of the water in the pool:
Density = mass/volume
Mass = density * volume
Since the pool is full of water, the volume of the water is equal to the volume of the pool:
Volume = 30 * 10 * 2.5 = 750 m³
Mass = 1000 * 750
Mass = 750,000 kg
We can now find the force required to pump the water out of the pool:
F = m * g
Where m = mass of water
g = acceleration due to gravity
F = 750,000 * 9.8 = 7,350,000 N
The work needed to be done is the product of the force required by the distance the water would need to move to be pumped out (depth of pool):
Work = F * d
Work = 7,350,000 * 2.5
Work = 18,375,000 J = 18,375 kJ
Answer:
high density can withstand high acceleration and applied forces
Heavy metals are toxic to humans,
the clay is quite abundant and in general it is not toxic
Explanation:
The selection of materials for the construction of rockets takes into account many aspects, the technical resistance to the demands of space travel, but also the abundance of the material. Heavy metals have two very serious problems. The first one, some of them are a little scarce in nature, but the most serious problem is that almost all of them are toxic to humans, for example: lead and mercury.
On the other hand, the clay is quite abundant and in general it is not toxic to living beings.
If we use Newton's second law
F = m a
let's use the concept of density
rho = m / V
m = rho V
let's substitute
F = rho V a
From this expression we see that a material with high density can withstand high acceleration and applied forces, such as those existing in spacecraft clearance and re-entry to Earth.
Unfortunately with this law there is no criterion to select a material unless its density is high, in addition to this criterion low toxicity criteria for human beings are used,
Answer:
The pole stores elastic potential energy when the pole is bent because its shape is change from its natural shape and it will want to go back to its original form, just like a spring or stretched elastic material.
Question:
Why did you lie about being in college?
<span>Matter is c) something that has mass and occupies space. Everything in our known universe takes up space, and everything is made up of matter. Matter as a concept is not something that can have any unit of measurement put upon it. </span>
