Answer:
a) ΔE = 25 %
b) v = 8,85 m/s
c) The energy was used against air resistance
Explanation:
In any situation total energy of a body is equal to potential energy plus
kinetic energy, then, just at the moment when Isaac dop the ball the situation is:
Ei = Ep + Ek where Ep = m*g*h and Ek = 1/2*m*v²
As v = 0 (Isaac drops the ball)
Ei = Ep = m*g*h = 2*m*g
At the end (when the ball bounced to 1,5 m
E₂ = Ep₂ + Ek₂ again at that point v =0 and
E₂ = 1,5*m*g*
Ei = E₂ + E(lost)
E(lost) = Ei - E₂
E(lost) = 2*m*g* - 1,5*m*g and the fraction of energy lost is
E(lost)/Ei
ΔE = (2*m*g* - 1,5*m*g )/ 2*m*g
ΔE = 0,5*m*g / 2*m*g
ΔE = 0,5/2
ΔE = 0,25 or ΔE = 25 %
b) The speed of the ball is
Potential energy is converted in kinetic energy just when the ball is touching the ground, then
m*g*h = 1/2*m*v²
2*h*g = 1/2 *v²
v² = 4*g*h
v² = 4*2*9,8
v² = 78,4
v = 8,85 m/s
If the impact is an elastic collision, then Ek before and after the impact is the same.
Answer:
the distance between the particles and also the amount of electric charge they carry.
Explanation:
yup
Answer:
82.25 moles of He
Explanation:
From the question given above, the following data were obtained:
Volume (V) = 10 L
Mass of He = 0.329 Kg
Temperature (T) = 28.0 °C
Molar mass of He = 4 g/mol
Mole of He =?
Next, we shall convert 0.329 Kg of He to g. This can be obtained as follow:
1 Kg = 1000 g
Therefore,
0.329 Kg = 0.329 Kg × 1000 g / 1 Kg
0.329 Kg = 329 g
Thus, 0.329 Kg is equivalent to 329 g.
Finally, we shall determine the number of mole of He in the tank. This can be obtained as illustrated below:
Mass of He = 329 g
Molar mass of He = 4 g/mol
Mole of He =?
Mole = mass / molar mass
Mole of He = 329 / 4
Mole of He = 82.25 moles
Therefore, there are 82.25 moles of He in the tank.
Answer:
Acid mine drainage is dissolved toxic materials wash from mines into nearby lakes and streams.
Explanation:
Acid mine drainage is the flow of acidic water with pH typically between 2 and 4, and high concentrations of other dissolved toxic materials from mines into nearby lakes and streams. It mainly occurs during metal sulfide mining, when the metal sulfide ore such as pyrite (FeS2) is exposed to water and oxygen from air to produce soluble iron and sulfuric acid.
Microorganisms, especially acidophile bacteria like Acidithiobacillus ferrooxidans grow by pyrite oxidation, i.e., oxidizing the Fe²⁺ in pyrite to Fe³⁺, which again react with pyrite and water to produce sulfuric acid. Then the acidic water flows into nearby water sources and reduces the pH value of water in those sources. As a result, heavy metals such as copper, lead, mercury, etc in other mineral ores also get dissolved into the water. The action of acidophile bacteria also increases the rate and degree of acid-mine drainage process.
The acid mine drainage causes water pollution and adversely affect the aquatic plants and animals. It also results in the contamination of drinking water, corrosion of infrastructures such as bridges, etc.
Answer: Potassium iodide
Explanation: their you go
