What is the correct name for the ionic compound, MgCl2? A) manganese chloride B) magnesium chloride C) magnesium dichloride D) m
2 answers:
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Answer:
R' = R/4
Explanation:
The resistance of a metal rod is R. It is given by the relation as follows :
Where
l is the length and A is the area of cross-section
If both its length and its diameter are quadrupled, it means,
l' = 4l
and d'= 4d
It means,
Let new resistance be R'. So,
So, the correct option is (B) "R/4".
- Initial velocity=u=10m/s
- Final velocity=v
- Acceleration=a=4m/s^2
- Distance=s=60m
According to third equation of kinematics
The density of the nugget is and is made of gold
Explanation:
The density of an object can be calculated as
where
d is the density
m is the mass
V is the volume of the object
We have to note that density of an object actually depends on the material the object is made of (therefore, two objects made of the same material can have different mass and different volume, but they have same density).
For the nugget in this problem, we have:
mass: m = 38 g
volume:
So, its density is
And by looking at the table, we see that this value corresponds approximately to the density of gold, so the nugget is made of gold.
Learn more about density:
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