Answer:
A. The combustion of fossil fuels heats water to produce steam, which then turns a turbine.
Explanation:
Most heat-based generation of electricity uses steam and steam-driven turbines to actually turn the generator. This includes coal, oil, gas, and nuclear power, and some solar power as well.
The heat source is used to heat water, turning it to steam. The steam is then directed at a turbine, turning it and the attached generator to produce electricity.
The time it takes for 1g of strontium-90 to decay to 250 mg is; 57.6 years
<h3>What is the half life of an element?</h3>
The formula for half life is;
A(t) = A₀ * (¹/₂)^(t/t_1/2)
Where;
A(t) is amount left after t years
A₀ the initial quantity of the substance that will undergo decay;
t_1/2 is the half-life of the decaying quantity.
We are given;
t_1/2 = 28.8 years
A₀ = 1 g
A(t) = 250 mg = 0.25 g
Thus;
0.25 = 1 * (¹/₂)^(t/28.8)
log 0.25 = (t/28.8) log (1/2)
-0.60206 = (t/28.8) * -0.3010
t = 2 * 28.8
t = 57.6 years
Read more about half life at; brainly.com/question/11152793
Congressional acts and the Constitution
Answer:
The agrarian nature of medieval European economies and their reliance on coerced labor.
Explanation:
The passage is a letter from King Edward III of England which was written in the year 1351. He stated in the letter that the nation was just recovering from a pestilence that had debilitating effects. The farmers who were mostly slaves were refusing to work unless they were given increased wages.
King Edward addressed this problem which caused "grave inconveniences" by stating in his letter that all slaves must be forced to return to their masters and that they were to be paid the wages agreed upon five years ago. He also stated that whoever refused to abide by this rule was to be confined to jail.
Answer:
that seems pretty hard good luck btw
