An example of a mechanical wave is a sound wave
Parallel to the velocity city is zero
<h2>The K.E of the charge is 1.02 x 10⁻¹⁷ J</h2>
Explanation:
When the charge of 2e is placed in between the plates .
The force applied on this charge by plates is = q E
here q is the magnitude of charge = 2 e = 2 x 1.6 x 10⁻¹⁹ C
and E is the magnitude of electric field intensity
The work done = Force x displacement
Thus W = q E x S
here S is displacement
Therefore W = 2 x 1.6 x 10⁻¹⁹ x 4 x 8
= 1.02 x 10⁻¹⁷ J
This work will be converted into the kinetic energy of charge .
Thus K.E = 1.02 x 10⁻¹⁷ J
If a car is traveling on the highway at a constant velocity, then the force that pushes the car forward must be <em>equal to the force of friction exerted upon the car</em>, AND in exactly the opposite direction. <em>(D)</em>
If that's true, then the forces on the car are balanced, and the car doesn't accelerate ... which is exactly what we need, because you told us that the car is moving along the highway "at a constant velocity".
