Its D all of the planets including earth revolve around the sun
Answer:
6 m/s East
Explanation:
Momentum = Mass . Velocity
26100 = 4350. Velocity
Velocity = 6m/s East
As the light pass through different media, it experiences a refraction. This is a phenomenon where the speed and direction of light changes. If the ray of light moves towards the normal line, the angle is decreased. So, is the speed of that light.
Answer:
High altitude
Explanation:
Infrared rays are absorbed by water vapor in the lower parts of our atmosphere such as near the sea level.Infrared telescopes positioned on high mountains can observe the cosmos at a wavelength near-infrared. In this case, this telescope is positioned on a mountain top where the altitude is high.
(b) 71%
The thermal efficiency of a Carnot heat engine is given by:
where
W is the useful work done by the engine
is the heat in input to the machine
In this problem, we have:
is the heat absorbed
is the work done (175 kJ is the heat released to the sink, therefore the work done is equal to the difference between the heat in input and the heat released)
So, the efficiency is
(a) 
The efficiency of an engine can also be rewritten as
where
is the absolute temperature of the cold sink
is the temperature of the source
In this problem, the temperature of the sink is
So we can re-arrange the equation to find the temperature of the source:
