1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tanzania [10]
3 years ago
6

An electron initially 3.00 m from a nonconducting infinite sheet of uniformly distributed charge is fired toward the sheet. The

electron has an initial speed of 420 m/s and travels along a line perpendicular to the sheet. When the electron has traveled 2.00 m, its velocity is instantaneously zero, and it then reverses its direction. What is the surface charge density on the sheet?
Physics
1 answer:
Cloud [144]3 years ago
5 0

Answer:

4.4443704375\times 10^{-18}\ C/m^2

Explanation:

\epsilon_0 = Permittivity of free space = 8.85\times 10^{-12}\ F/m

\Delta l = Distance charge traveled = 2 m

v = Velocity of electron = 420 m/s

E = Electric field

m_e = Mass of electron = 9.11\times 10^{-31}\ kg

q_e = Charge of electron = 1.6\times 10^{-19}\ C

As the energy of the system is conserved we have

q_eE\Delta l=\dfrac{1}{2}m_ev^2\\\Rightarrow E=\dfrac{1}{2}\dfrac{m_e}{q_e}\times \dfrac{v^2}{\Delta l}\\\Rightarrow E=\dfrac{1}{2}\dfrac{9.11\times 10^{-31}}{1.6\times 10^{-19}}\times \dfrac{420^2}{2}\\\Rightarrow E=2.51094375\times 10^{-7}\ N/C

For an infinite non conducting sheet electric field is given by

E=\dfrac{\sigma}{2\epsilon}\\\Rightarrow \sigma=2E\epsilon\\\Rightarrow \sigma=2\times 2.51094375\times 10^{-7}\times 8.85\times 10^{-12}\\\Rightarrow \sigma=4.4443704375\times 10^{-18}\ C/m^2

The surface charge density is 4.4443704375\times 10^{-18}\ C/m^2

You might be interested in
Dogs are able to hear much higher frequencies then humans are capable of detecting. For this reason the crystals that are inaudi
AVprozaik [17]

Answer:

Dogs are able to hear much higher frequencies than humans are capable of detecting. For this reason, dog whistles that are inaudible to the human ear can be heard easily by a dog. If a dog whistle has a frequency of 30,000 Hz, what is the wavelength of the sound emitted?

3 0
3 years ago
What does this mathematical expression mean? D 1/T
san4es73 [151]
The question is incomplete. If D=1/T then the answer is D, but if instead of =, there is a proportional sign, then the answer is C.
7 0
3 years ago
Read 2 more answers
What would be the orbital speed and period of a satellite in orbit 0.82 ✕ 108 m above the earth?
Ivenika [448]
The answer should be 88.56
3 0
3 years ago
The heating element in a kettle behaves like a resistor. A particular kettle needs to operate at 230 V, with a power of 1500 W.
dedylja [7]

Answer:

R = 35.27 Ohms

Explanation:

Given the following data;

Voltage = 230V

Power = 1500W

To find the resistance, R;

Power = V²/R

Where:

V is the voltage measured in volts.

R is the resistance measured in ohms.

Substituting into the equation, we have;

1500 = 230²/R

Cross-multiplying, we have;

1500R = 52900

R = 52900/1500

R = 35.27 Ohms.

Therefore, the resistance which the heating element needs to have​ is 35.27 Ohms.

4 0
2 years ago
a skinny girl devours food that is equivalent to 600 kcal, as she is anorexic she repents and wants to lose twice as many calori
blondinia [14]

Answer:

Explanation:

Work done in lifting the weight once = mgh

= 20 x 9.8 x (1.9+1.7)

= 705.6 J  

= 705.6 / 4.2 calorie

= 168 cals

Total energy to be spent = 600 x 10³ cals

No of times weight is required to be lifted

= 600 x 10³ / 168

= 3.57  x 10³ times

Total time to be taken = 2 x 3.57 x 10³

= 7.14 x 10³ s

=119 minutes .

4 0
3 years ago
Other questions:
  • Which sequence correctly reflects the order in which electrical charges occur during an action potential, from first to last?
    14·1 answer
  • Which is it. I don't understand
    10·2 answers
  • In one sentence describe how the electricity in an action potential is generated
    15·1 answer
  • __________ are seismic waves that pass through the earth's interior, spreading out from the focus in all directions.
    11·1 answer
  • would it be possible for a small man running fast to have the same kinetic energy as a large man who runs slowly?
    8·1 answer
  • In a coal power plant, coal is burned to heat steam, which spins a turbine. What energy conversion is happening in a coal power
    8·2 answers
  • HEELLLPPPPP !
    5·1 answer
  • You are kicking your soccer ball back and forth on a soccer field. You kick the ball forward for 10 m. You turn completely aroun
    14·1 answer
  • What is the maximum velocity at which a 60-watt motor can lift an 8.5-kg mass upward?
    9·1 answer
  • I NEED HELP ASAP!!!!!!!!!!! Draw a circuit with a switch, and 5 light bulbs. 3 of the bulbs must be in a series and be operated
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!