To solve this problem we will apply the concepts related to the Impulse-Momentum theorem. On this theorem it is specified that the Momentum is defined as the product between the mass and the velocity of the object, and the Impulse as the product between the Force and time. Both concepts fully comparable to each other. Mathematically they can be described as,
And
Here,
According to the value given we have that the change in velocity in the momentum is
Using this value to find the Net force we have that
Therefore the correct answer is C.
Answer;
A. hydroelectricity
Explanation;
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I will assume you are asking what the initial acceleration of the sphere is since the information provided seems to indicate that.
First we need to know Newton's Law
F=ma.
We know the mass of the sphere and we want a so we solve to get
a=F/m.
Now we need the force on the charged sphere. This is given by the electric field, E and the charge, Q. The relationship is F=Q×E. (Recall that the electric field units can be expressed in Newtons/Coulomb).
Now the electric field above a large (~infinite) sheet of charge with a known charge density σ, is given by
E = σ/(2ε0)
Plug in your values of σ, to get E, then the sphere charge Q to get F, the the mass into a = F/m to get the acceleration
- Flat mirror is given here
- We know that in a flat mirror the distance of object from the mirror is equal to distance of image from the mirror i.e v=u
- Only the side of image changes ime left is seemed right.
So the speed remains same 0.25m/s.
