![bubblegum2850](/avatars/6190.jpg)
bubblegum2850
19.10.2019 •
Physics
An electron has an initial speed of 5.85 106 m/s in a uniform 5.55 105 n/c strength electric field. the field accelerates the electron in the direction opposite to its initial velocity. (a) what is the direction of the electric field? opposite direction to the electron's initial velocity same direction as the electron's initial velocity not enough information to decide (b) how far does the electron travel before coming to rest? m (c) how long does it take the electron to come to rest? s (d) what is the electron's speed when it returns to its starting point? m/s
Solved
Show answers
More tips
- F Food and Cooking Red Caviar: How to Choose the Best?...
- C Computers and Internet Clearing Cache: How to Speed Up Your Browser...
- S Style and Beauty How are artificial nails removed?...
- S Style and Beauty Secrets of Tying a Pareo: 5 Ways...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
Answers on questions: Physics
- P Physics #1: the following question appears on a quiz: a 1.0 l balloon has a pressure of 153 kpa at a temperature of 60°c. how many moles of gas are inside the balloon? a...
- P Physics Calculate the change in time for each quarter of the track. record the change in time in table e of your student guide. the change in time for the first quarter is...
- P Physics According to the doppler effect what appears to happen when a light source moves closer to an observer...
- P Physics In the 1920s what did edmund hubble notice about the galaxies...
- P Physics Running is probably the simplest individual sport for promoting both health-related and skill-related fitness. select the best answer from the choices provided. t...
- P Physics How can you tell if a crown is made of solid gold?...
- P Physics 1- En el sistema de la figura m, = 2,00 kg y m2 = 6,00 kg. La polea tiene masa despreciable y el coeficiente de fricción entre la superficie y m, es de 0,5. Determine...
- P Physics Why is the wind an energy source with limited uses....
- P Physics Why soft iron core is used in moving coil galvanometer....
- E English Yall dare me to call him daddy ? just to see how fast he answer?...
Ответ:
(a) same direction as the electron's initial velocity
The direction of the acceleration is opposite to the direction of the velocity of the electron. This means that the electron is feeling a repulsive force, in a direction opposite to its initial velocity.
For a negative charge, we know that the electrostatic force and the electric field have opposite directions, because in the formula
q is negative. Therefore, the electric field must be in the same direction as the initial velocity of the electron.
(b)![1.76\cdot 10^{-4}m](/tpl/images/0333/4845/bb162.png)
When the electron comes to rest, all its initial kinetic energy has been converted into electric potential energy. So we can write
where
Solving the equation for d, we find
which corresponds to 0.17 mm.
(c)![6\cdot 10^{-11} s](/tpl/images/0333/4845/2ef94.png)
First of all, we need to find the electrostatic force acting on the electron:
Now we can find the acceleration of the electron:
(the acceleration is negative because it is opposite to the electron's direction of motion)
And now we can find the time taken for the electron to stop to a velocity of v=0 starting from
:
(d)![5.85\cdot 10^6 m/s](/tpl/images/0333/4845/23620.png)
When it returns to the starting point, all the electric potential energy gained by the electron through the distance d will be re-converted back into kinetic energy. If there is no loss of energy, therefore, this means that the electron will have the same kinetic energy it had at the beginning of the motion: therefore, its speed will be equal to its initial speed,
.
Ответ:
Mark her brainliest already