If we define each of the systems that are given in the options we will have to:
Air conditioning is the air treatment that modifies its conditions to suit certain needs, i.e., the process of removing heat and moisture from the interior of an occupied space to improve the comfort of occupants. Air conditioners are also responsible for controlling humidity in closed rooms.
Positive Pressurization is a pressure within a system that is greater than the surrounding environment. Consequently, if there is any leakage of the system with positive pressure, it will leave the surrounding environment. There is no temperature or humidity control here
Ventilation is done by artificially creating depressions or overpressures in air distribution ducts or building areas. The fans are mechanically responsible for increasing the volume flow of air in a system. Moisture is not controlled directly.
Therefore the correct answer is A.
Don’t forget about the formulas!
P=E/T
E=P•T
T=E/P
P= 45,000J / 90sec
500W is your answer
Answer:
c. Fission and fusion are two processes that release very little amounts of energy.
Explanation:
This statement is false. In fact, both fission and fusion are processes which release very large amounts of energy. The statement can be rewritten as it is true as follows:
"Fission and fusion are two processes that release very large amounts of energy."
Fission occurs when a large nucleus break apart, splitting into smaller nuclei, while fusion occurs when two light nuclei combine together into a larger nucleus. In both cases, the mass of the reactants is larger than the mass of the final products, so some of the mass has been converted into energy, according to Einstein's equation:

where
E is the energy released
is the mass lost in the process
c is the speed of light
Since c is a very large number (
), we see that even a very small mass
causes the released of a huge amount of energy, so both fission and fusion release large amounts of energy.
Not sure .sorry I just don't understand.
Answer: 2.61 s
Explanation:
We are given the following data:
is the initial height of the object
is the initial height of the object
In addition, the motion of the object is given by:
(1)
Where:
is the final height of the object
is the time the object is in the air before hitting the ground
Rewritting (1) with the given data:
(2)
Solving the quadratic equation with the quadratic formula
, where
,
,
and choosing the positive value of time:
(3)
(4) This is the time