Answer:
η = 40 %
Explanation:
Given that
Qa ,Heat addition= 1000 J
Qr,Heat rejection= 600 J
Work done ,W= 400 J
We know that ,efficiency of a engine given as
Now by putting the values in the above equation ,then we get
η = 0.4
The efficiency in percentage is given as
η = 0.4 x 100 %
η = 40 %
Therefore the answer will be 40%.
The Earth itself is a source of terrestrial radiation. Radioactive materials including uranium, thorium, and radium exist naturally in soil and rock. Essentially all air contains radon<span> , which is responsible for most of the dose that Americans receive each year from natural background sources.</span>
The correct answer is creativity
Being kind and helpful in no way helps you develop theories, however, being creative does because creativity leads to ingenuity and testing and trying various things.
Wave speed = frequency * wavelength
Input the numbers into this equation :
Wave speed = 200 * 3
Work it out and you will get the answer :
Wave speed = 600 m/s
The statement “All of the earth's life and weather exists
within the stratosphere” is false. The answer is letter B. The answer is the
troposphere. The first layer, troposphere, is where we are able to do most of
our activities. This is where we can see the formation of clouds, the
production of rain, hail, snow and other weather phenomenon. Also, this layer
is where the greatest amount of air pressure because most of the molecules of
air are in this area. Like us, air has also mass and the pressure is brought
down by the earth’s gravity causing an increase in weight exerted on you as you
descend lower into the atmosphere. So, as you enter into the other layers of
atmosphere above the troposphere, the air pressure starts to decrease. <span>Below the
atmosphere is the hydrosphere. This is where all liquid forms are located. And
since the seawater has a greater mass than air, it has the greatest
pressure. </span>
