Answer:
The rate at which it will radiate heat is closest to 127.2J.
Explanation:
According to Stefan's law, the heat radiated by a black body can be written as:
is directly proprtional to the 
.
where H is the amount of heat radiated and T is the surface temperature .
<u>Example</u> : The heat is transferred by radiation and an example of heat transferred by radiation is the sunlight reaching earth from sun.
<u>Note</u> : Here the temperature is expressed in Kelvin.
- Initial rate of heat ,
- Final rate of heat ,
= unknown
- Initial temperature ,
- Final temperature ,
.
The rate at which it will radiate heat is closest to 127.2J.
no because there is no chance that it will possibly hit eachother
Answer:
B. 2K + Br2 + 2KBr
D. C + 02 → CO2
Explanation:
In balancing a chemical reaction, the number of atoms on both sides of the expression must be the same in order to obey the law of conservation of mass.
According to the law of conservation of mass, in a chemical reaction, matter is neither created nor destroyed.
So, let us investigate:
Number of atoms
Reactants Products
K 2 2
Br 2 2
C + 0₂ → CO₂
C 1 1
O₂ 2 2
We see that for both equations, the number of atoms on both sides of the expression is the same.
Answer:
Explanation:
Distance of each of the charges from the center are equal . If this distance be d
d = .5 x length of diagonal of square
length of diagonal = 4√2
d = .5 x 4√2
= 2√2
potential at a point
V = k Q / r where k is a constant , Q is charge and r is distance of the point from the charge .
k = 9 x 10⁹
Total potential = 
= 
= 9 √2 x 10⁹ V .
