red hot is hot, but other colours are even hotter. stars may be hotter than red hot.
there is also something calle the red shift.
Answer:disequilibrium
Explanation:
When the net force is not zero it is called disequilibrium
Elliptical and Spiral have some similarities, they both are huge and contain lost of dust and also they are held by gravitational forces.
Answer:
(a) Heat transfer to the environment is: 1 MJ and (b) The efficiency of the engine is: 41.5%
Explanation:
Using the formula that relate heat and work from the thermodynamic theory as:
solving to Q_out we get:
this is the heat out of the cycle or engine, so it will be heat transfer to the environment. The thermal efficiency of a Carnot cycle gives us: 
where T_Low is the lowest cycle temperature and T_High the highest, we need to remember that a Carnot cycle depends only on the absolute temperatures, if you remember the convertion of K=°C+273.15 so T_Low=150+273.15=423.15 K and T_High=450+273.15=723.15K and replacing the values in the equation we get:
