Answer:
Calcium and barium
Explanation:
Krypton is a noble gas it do not take part in any reaction its physical and chemical property does not resembles to other atoms.
Hydrogen is the reducing gas its physical and chemical property does not resembles to other atoms.
Silicon is a semiconductor its physical and chemical property does not resembles to other atoms.
Calcium and Barium are placed in the same group 2 in the periodic table . Both are alkaline earth metal.
As both element are placed in the same group they have same physical and chemical properties.
Example:
- Electro-negativity of Calcium and barium are approximately same.
- Both have same oxidation states +2, both are strong basic oxide.
- Both are present in nature in solid state.
- Both are s- block element.
Thus, we can say Barium and Calcium have similar properties.
Input energy is: 200 joule
Output energy is: 100 joule
100/200*100=%50 efficiency
When it’s about to be dropped
Answer:
The value is 
Explanation:
From the question we are told that
The current is 
The inductor is 
The voltage induced is 
Generally the emf induced is mathematically represented as
Here 
is the time taken
=> 
=> 
=>
Answer:
It is<em> impossible</em> to construct a machine which produces the <em>work output greater than the work input.</em>
Let us consider the II law of thermodynamics.
According to Kelvin Plank's statement any engine/machine does not give hundred percent efficiency. And violating the PMM-II(Perpetual motion of machine II kind), Always some amount of energy transferred to the sink or surroundings.
Therefore
W(ouput) = Q₁-Q₂
There are many reasons to lower the work output, just for an example friction between the mating parts reduces the work output.
