<span>Hard Rock
mining works when a narrow horizontal vein orebody will be mined by room and
pillar or a longwall method whereas a vertical narrow vein orebody will be
mined by an open stoping or cut and fill method. However, there are further
consideration needed for the strength of the ore as well as the surrounding
rock. In addition an orebody hosted in strong self-supporting rock may be mined
by an open stoping method while an orebody hosted in poor rock may need to be
mined by a cut and fill method were the void is continuosly filled as the ore
is removed. </span>
B. Mexico is one of the first Latin American countries to have a separate ministry of tourism with dedicated funds within its federal governmental structure.
Given :
John's car had 106,076 miles on it. Of that distance, John's wife drove 29,432 miles, and his son drove 5,389 miles. John drove the rest.
To Find :
How many miles did John drive.
Solution :
Total miles = miles drive by john( j ) + miles drive his wife + miles drive by his son
106076 = j + 29432 + 5389
j = 106076 - 29432 - 5389
j = 71255 miles
Therefore, miles drive by John is 71255 miles .
Hence, this is the required solution.
Answer:
Explanation:
Given data:
wavelength = 21 cm
from wein's displacement relation we have
Where,
b is wein's constant and it is given as
and T is temperature of radiation , represent wavelength
Putting all value in the above equation to obtained desired temperature value