For Newton's second law, the force is equal to the product between the mass and the acceleration of the rocket:

From which we can rewrite the acceleration as

where m=7.0 kg.
The velocity of the rocket is the derivative of the acceleration:

and if we substitute x=9.0 m, we find the rocket velocity after 9.0 m:
Explanation:
thet amplify DC, because of the voltage ( small current input signal)
Answer:
The tension in the string is quadrupled i.e. increased by a factor of 4.
Explanation:
The tension in the string is the centripetal force. This force is given by

m is the mass, v is the velocity and r is the radius.
It follows that
, provided m and r are constant.
When v is doubled, the new force,
, is

Hence, the tension in the string is quadrupled.
Let us consider body moves a distance S due to the force F.
Hence the work by the body W = FS
If the force is not along the direction of displacement,then the work by a body for travelling a distance S will be -
where
is the component of the force along the direction of displacement.


As per the question the power P is given as -




Hence alternative definition of power P = F.V
Answer:

Explanation:
Given that
Length= 2L
Linear charge density=λ
Distance= d
K=1/(4πε)
The electric field at point P



So

Now by integrating above equation
