Answer:
a. 80 J/cell b. 1.02 × 10²¹ W/m² c. 8.77 × 10¹¹ V/m d. 2.92 × 10³ T
Explanation:
a. We know that energy E = Pt where P = power and t = time
The total energy delivered to all the 100 cells is E = average power × time
average power = 2 × 10¹² W and time = 4 ns = 4 × 10⁻⁹ s
E = 2 × 10¹² W × 4 × 10⁻⁹ s = 8 × 10³ J
The energy per cell E₁ = E/100 = 8 × 10³ J/100 = 80 J/cell
b. Intensity, I = P/A where P = power per cell = 2 × 10¹² W/100 = 2 × 10¹⁰ W and A = area = πr². Since the cell is modeled as a disk of diameter d = 5.0μm, r = d/2 = 5.0 μm/2 = 2.5 μm = 2.5 × 10⁻⁶ m
I = P/A = P/πr² = 2 × 10¹⁰ W/π(2.5 × 10⁻⁶ m)² = 1.02 × 10²¹ W/m²
c. The intensity I = E²/2cμ₀ where E = maximum value of electric field, c = speed of light = 3 × 10⁸ m/s and μ₀ = 4π × 10⁻⁷ H/m
E = √(I2cμ₀) = √(2 × 1.02 × 10²¹ W/m² × 3 × 10⁸ m/s × 4π × 10⁻⁷ H/m) = 8.77 × 10¹¹ V/m
The maximum magnetic field B is gotten from E/B = c
B = E/c = 8.77 × 10¹¹ V/m/3 × 10⁸ m/s = 2.92 × 10³ T
c. Money serves as a store of value.
b. Money is a unit of account.
d. all of the above
Answer;
A. Money is a medium of exchange.
Explanation;
Money actually serves several different key functions in our economy. It is a medium of exchange, a unit of account, and a store of value.
D. All of the above statements are true. Money is a medium of exchange, a unit of account, and a store of value.
Money is a medium of exchange because it is used to buy goods and services. It is also a unit of account because prices and values are expressed in terms of money. Lastly, money serves as a store of value, allowing individuals to save and accumulate wealth over time. Money serves various essential functions in modern economies. It is a medium of exchange, facilitating the buying and selling of goods and services.
Money also acts as a unit of account, providing a common measure of value for comparing prices. Additionally, it serves as a store of value, allowing individuals to save and transfer purchasing power over time. Money enables economic efficiency, trade, investment, and financial transactions, making it a cornerstone of economic systems.
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dissolved toxic materials wash from mines into nearby lakes and streams.
a buildup of residual acidity in soils destroys large areas of vegetation.
the acidity of metals in mines exceeds level 9 on the pH scale.
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:
final velocity will be44.72m/s
Explanation:
HEIGHT=h=100m
vi=0m/s
vf=?
g=10m/s²
by using third equation of motion for bodies under gravity
2gh=(vf)²-(vi)²
evaluating the formula
2(10m/s²)(100m)=vf²-(0m/s)²
2000m²/s²=vf²
√2000m²/s²=√vf²
44.72m/s=vf
Answer:
44.2m/s
Explanation:
2gs = vf*2 - vi*2
2 x 9.8 x 100 = vf*2 - 0
1960 = vf*2
vf = 44.2 m/s
c. has strong, spinning winds
b. has warm, calm air and light winds
d. has spiraling bands of heavy rain
Answer:
Explanation:
The eye of a hurricane is calm and "peaceful", it's the region with calm weather. But the eyewall is really dangerous, due to its pressure and speed difference. Actually, the eyewall has the most severe winds and weather. Another important characteristic is that the eye has the lower pressure.
So, among the options, b. is the right answer.
b. has warm, calm air and light winds
Answer:
o m
Explanation:
The net displacement is 0 because it returns to its original position. The final position and initial position are the same, so displacement is 0.