0.5mv^2
0.5 times 40 times 3^2
The kinetic energy is 180
the <u>average powe</u><u>r</u> output of the sun is <u>3.8 × </u>
<u> W</u> given that about 1350 w/m2 reaches the upper atmosphere of the earth.
As we know intensity falling over a surface is equal to Energy falling per unit area per unit volume.
I = 
Since Power is equal to energy/time
I = power/area
or
Power = Intensity × area
Now, Distance from Sun to Earth , r = 149.6 ×
m
So, Surface area of the sphere of radius is:
A = 4 π 
= 4 × 3.14 × (149.6 × )²
= 2.81 × 
m²
Thus Average Power output of the sun will be:
P = 1350 × 2.81 ×
= 3.7935 ×
P = 3.8 × W
So the average power output of the sun is 3.8 × W.
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.Water
Adequate water supplies of high quality are necessary both for community use and local ecosystems. Communities and jurisdictions must work together to assure an adequate water supply to meet future needs. This section presents resources to aid in that effort.Energy
Communities require energy. Nonrenewable sources for power generation, home and workplace, and transportation cause pollution and its harmful impacts. Energy conservation and the use of renewable fuels provide cost-effective and more sustainable alternatives. This section contains resources available to make energy use more efficient.Air and Climate
Both the natural ecosystem and human health can be adversely impacted by declining air quality and climatic change. Communities can preserve air quality by limiting or eliminating the discharge of harmful chemicals into the air and by minimizing the sources of air pollution. This section contains resources and approaches that address air quality and climate change.Biodiversity
Biodiversity is particularly important for creating sustainability because of the specialized roles each species plays in maintaining ecological balance. Communities can promote healthy wildlife by supporting integrative approaches for managing, protecting, and enhancing wildlife populations and habitats appropriate to their area. Some examples are given here.Land, Forests, and Ecosystems
While providing a protective covering for soil, water, and the atmosphere, forests are also renewable sources of an endless variety of products. In a healthy ecosystem, policies and programs must balance economic and conservation needs. This section highlights cases where communities have developed land use practices and businesses that both conserve ecosystems and enhance local economies.
Dropping two objects and seeing them hit the ground at the same time
Answer: C. physical fitness components
Explanation:
The physical activities includes daily activities which are part of daily routine. These include exercise, cooking, walking and others.
The physical fitness components can reduce the risk of beginning of the diseases and they will promote total health. These include cardiovascular endurance which provide safety against the heart diseases, muscular strength will allow the body to perform daily activities without any difficulties, flexibility, and body composition. The body composition will help to keep the body in proper shape.
