Answer:
C.Electrons,protons.
Explanation:
Cations:
When metal loos it electrons then it will form cations.
Ex:
Anion:
When metal gain electron then it will from anions.
Ex:
So from above we can say that ,the cations have fewer electrons than protons.Protons is also called as positive charged ions and electron are also called negatively charge ions.
SO the option is C is correct.
Answer:
The change in momentum is
Explanation:
From the question we are told that
The time taken for the stone to stop is
The net force on the rock is
The impulse of the rock can be mathematically represented as
Substituting values
Now impulse is defined as the rate at which momentum change
Hence the change in momentum of the rock is equal to the impulse of the rock
So
The frictional force is 39.4 N
Explanation:
We can solve this problem by applying Newton's 2nd law of motion: in fact, the net force acting on the block is equal to the product between its mass and its acceleration. So we can write
where
is the net force
m is the mass
a is the acceleration
Here we know that the box is moving with constant velocity, so its acceleration is zero:
This means that the net force is also zero:
The net force on the block is given by the applied force, forward, and the frictional force, backward:
where
is the applied force
is the frictional force
Therefore, solving for ,
Learn more about friction:
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