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williamabigan
12.11.2020 •
Physics
Why are wildfires getting worse ? Does is have to do with Climate Change ?
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Ответ:
There is a logical explanation for that.
Explanation:
Human activities such as lighting campfires and discarding lit cigarettes are responsible for starting fires, hotter weather makes forests drier and more susceptible to burning.
Rising temperatures, a key to climate change, evaporate moisture from the ground, drying out the soil, and making vegetation more flammable. At the same time, winter snowpacks are melting a month earlier, meaning forests are drier for longer periods.
As drought and rising heat continue with rising greenhouse gas emissions, there will be more expected wildfires in the years ahead, especially with the fire seasons getting longer.
Ответ:
1. By performing an experiment.
2. By calculating it using law of gravitation.
Explanation:
Method 1:
Step 1: First you need a timer, a ball and a smart phone with camera.
Step 2: Go to, say, third floor of your school building, drop the ball and start the timer.
Step 3: Take a shot every 1 second until the ball reaches the ground.
Step 4: Check your photo. Pay attention to where it reaches at every second. Try to measure the distance it goes from the top. Ex: t = 1, d = ?, t = 2, d = ? ...
Step 5: Since velocity = distance / time, now you can calculate like v1 = d1 / t1, v2 = d2 / t2 ...
Step 6: Since acceleration = velocity / time, now you can calculate a1 = v1 / t1, a2 = v2 / t2 ...
Step 7: Repeat this measurement for several times, and you'll find the average acceleration of gravity to be nearly 9.8 m/s^2.
Method 2:
We can simply apply the equation for getting the acceleration of gravity:
g = GM/r^2,
where G is the gravitational constant, M is the mass of Earth, r is the radius of Earth (since you probably need to know the acceleration of gravity near the surface of Earth).
Let's plug numbers in:
g =![6.67 \times 10^{-11} \frac{5.97 \times 10^{24}}{(6.38 \times 10^{6})^2}](/tpl/images/0282/5269/37780.png)
Try to calculate this, and you will get that g = 9.8 m/s^2.