Direction. Velocity is a vector that describes both speed and direction, while speed is a scalar that describes only speed regardless of direction.
Harnessing the sun's energy to produce heat or electricity is : A. Non - Polluting
This energy generating method will cause no dangerous emission for environment (unlike the one that came from fossil fuel), but the energy that produced from the sun tend to be more expensive so it's still not widely used
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Answer:
The Height is H = 70.02 m
Explanation:
We are given that the
Initial length is = 
= 
from what we are told in the question the circumference of the circle is = 
This means that the Radius would be :
Let C denote the circumference
So
=> 
We are told that 1-meter bar of steel that increases its temperature by 1 degree C will expand 
meters
Hence
The final length would be
Where T is the change in temperature 
is the Coefficient of linear expansion for steel
let 
denote the final length
So
![L_{final} =40000*10^{6} *[1+ 11*10^{-6}]](https://tex.z-dn.net/?f=L_%7Bfinal%7D%20%3D40000%2A10%5E%7B6%7D%20%2A%5B1%2B%2011%2A10%5E%7B-6%7D%5D)
Now the Height is mathematically represented as
Night vision cameras
Explanation:
One of the most common use of infrared waves is in night vision cameras. Infrared waves are electromagnetic radiations whose wavelengths are longer than those of visible light in the electromagnetic spectrum
They are used:
- In night vision cameras
- Thermal imaging whereby the radiation is used to monitor temperature differences between bodies.
- It can also be used as source of heating.
Learn more:
Radiation brainly.com/question/7746015
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The answer is 195 . i hope you enjoy the help
