Kinetic energy from plate A to plate B

In summary, an electron gains 3.45x10^(-16) J of kinetic energy when it is accelerated by an electric field in a computer monitor from plate A to plate B. The potential difference between the plates is 2.16x10^3V and plate B is at a higher potential. The potential energy of the electron at plate A is not given, but it is related to the difference of the plates' potentials through conservation of energy. The electron would be attracted to a positive plate and the plate with the higher potential would be positive.
  • #1
hanna.eunice
2
0

Homework Statement


An electron acquires 3.45x10^(-16) J of kinetic energy when it is accelerated by an electric field in a computer monitor from plate A to plate B. What is the potential difference between the plates, and which plate is at the higher potential?


Homework Equations


KE=1/2mv^2


The Attempt at a Solution


The given answer is 2.16x10^3V...How and why?
Plate B has the higher potential.
 
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  • #2
What is the potential energy of the electron at plate A?
 
  • #3
Nothing is given other than the acquired electron energy of 3.45x10^(-16). Sorry!
 
  • #4
Would the electron be attracted to a positive plate or a negative plate? Which plate (positive or negative) would have a higher potential?

Conservation of Energy: All the electric potential will be converted to kinetic.
 
  • #5
hanna.eunice said:
Nothing is given other than the acquired electron energy of 3.45x10^(-16). Sorry!

That is correct, but the electron still has some potential energy. How is it related to the difference of the plates' potentials?
 

FAQ: Kinetic energy from plate A to plate B

What is kinetic energy?

Kinetic energy is the energy an object possesses due to its motion. It is a form of energy that results from an object's mass and velocity.

How is kinetic energy transferred from plate A to plate B?

Kinetic energy can be transferred from one object to another through contact or through waves. In the case of plate A and B, kinetic energy can be transferred through contact if they are in direct contact with each other, or through waves if one is vibrating and causes the other to vibrate as well.

What factors affect the amount of kinetic energy transferred from plate A to plate B?

The amount of kinetic energy transferred between two objects depends on their mass, velocity, and the type of contact or interaction between them. The distance between the two objects can also play a role in the amount of kinetic energy transferred.

How can the kinetic energy transfer between plate A and plate B be measured?

Kinetic energy can be measured using the formula KE = 1/2 mv^2, where m is the mass of the object and v is the velocity. The kinetic energy transferred between two objects can be measured by calculating the change in kinetic energy of one object before and after the transfer.

What are some real-life applications of kinetic energy transfer between two objects?

Kinetic energy transfer is a fundamental concept in many fields, including physics, engineering, and chemistry. Some real-life applications include collisions between cars, balls, or any moving objects, energy transfer in electrical circuits, and energy transfer in chemical reactions.

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