Answer:
Force, |F| = 1360.24 N
Explanation:
It is given that,
Water from a fire hose is directed horizontally against a wall at a rate of 69.4 kg/s,
Initial speed of the water, u = 19.6 m/s
Finally water comes to stop, v = 0
To find,
The magnitude of the force exerted on the wall.
Solution,
Let F is the force exerted on the wall. The product of mass and acceleration is called the force exerted. Using second law of motion to find it as :
|F| = 1360.24 N
So, the magnitude of the force exerted on the wall is 1360.24 N.
A. iodine is located in period 5, group 17 and is classified
as a nonmetal
Group is the column, period is the raw.
Answer: 276 days
Explanation:
This problem can be solved using the Radioactive Half Life Formula:
(1)
Where:
is the final amount of the material
is the initial amount of the material
is the time elapsed
is the half life of polonium-210
Knowing this, let's substitute the values and find from (1):
(2)
(3)
(4)
Applying natural logarithm in both sides:
(5)
(6)
Clearing :
(7)
Answer:
so the distance between two points are
Explanation:
Surface charge density of the charged plane is given as
now we have electric field due to charged planed is given as
now we have
now for the potential difference of 100 Volts we can have the relation as
It is definitely letter D. <span>A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.
A1 and B1 is either both north poles or both south poles. Repulsion of both magnets says it all--like poles always repel while opposite poles always attract. Thus, the best conclusion to this would be choice D.</span>