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
Alona [7]
3 years ago
11

Two electrons are initially at rest separated by a distance of 2nm. At time t=0, they start to move apart due to Coulombic repul

sion. How long does it take for them to separate to a distance of 20nm?
Physics
1 answer:
Gnom [1K]3 years ago
3 0

Answer:

t=2.5\times 10^{-14}\ s

Explanation:

We know that charge on electron

q=1.6\times 10^{-19}\ C

r= 2 nm

We know that force between two charge given

F=K\dfrac{Q_1Q_2}{r^2}

Now by putting the value

F=9\times10^9\dfrac{1.6\times 10^{-19}\times 1.6\times 10^{-19}}{(2\times 10^{-9})^2}

F=5.67\times 10^{-11}\ N

We know that mass of electron

The mass of electron

m=9.1\times 10^{-31}\ kg

F= m a

a= Acceleration of electron

a= F/m

a=\dfrac{5.67\times 10^{-11}}{9.1\times 10^{-31}}\ m/s^2

a=6.2\times 10^{19} m/s^2

S=ut+\dfrac{1}{2}at^2

initial velocity given that zero ,u=0

20\times 10^{-9}=\dfrac{1}{2}\times 6.2\times 10^{19} t^2

t=\sqrt {\dfrac{40\times 10^{-9}}{6.2\times 10^{19}}}

t=2.5\times 10^{-14}\ s

You might be interested in
What happened 1 billion years after the Big Bang?
maks197457 [2]

Explanation:

1 billion years after the big bang, the temperature is 20K and some stars and galaxies began to contract due to the gravitational contraction of the over densities of the previous universe. At about 10 billion years after the big bang, our earth and sun form

8 0
3 years ago
The cycling of the air is a natural phenomenon as shown above is the result of
Ket [755]

Answer:

natural convection

............

6 0
3 years ago
Read 2 more answers
Radiation is energy that is (5 points) not transferred at all transferred by direct contact of two objects transferred by moving
BARSIC [14]
There isn't a question here so, true
3 0
3 years ago
A 13,500 kg railroad freight car travels on a level track at a speed of 4.5 m/s. It collided and coupled with a 25,000 kg second
expeople1 [14]

Answer: 1.6m/s

Explanation:

M1 = 13500kg

U1 = 4.5m/s

M2 = 25000kg

U2 = 0m/s (since the body is at rest)

V = ? (Common velocity or velocity after impact)

M1U1 + M2U2 = (M1 + M2)V

But U2 = 0

M1U1 = (M1 + M2)V

13500 * 4.5 = (13500 + 25000)v

60750 = 38500v

V = 60750 / 38500 = 1.5779 = 1.6m/s

7 0
3 years ago
two friends are talking to another person across the building the other person can hear them but not see them why is this?
Rufina [12.5K]

Answer:

Hey

Say that there was no light on in the building that they were ch,at,tin,g in, then they could hear each other but not see each other.

4 0
3 years ago
Other questions:
  • How does size influence the appearance of a star? Give an example in your response.
    10·1 answer
  • Logs sometimes float vertically in a lake because one end has become water-logged and denser than the other. What is the average
    5·1 answer
  • A 206.3 kg walrus initially at rest on a horizontal floor requires a 249 N horizontal force to set it in motion. Find the coeffi
    15·1 answer
  • A tugboat tows a ship with a constant force of magnitude F1. The increase in the ship's speed during a 10 s interval is 3 km/h.
    15·1 answer
  • In an 8.00 km race, one runner runs at a steady 11.0 km/h and other runs at 14.8 km/h. How far from the finish line is the slowe
    14·1 answer
  • How does no light affect the plants?
    10·1 answer
  • As a river's slop increases, the power of the river to cause erosion usually ______.
    5·2 answers
  • What is the wavelength of an FM radio
    6·1 answer
  • You push on a 35N object for 3 seconds. find work?
    14·1 answer
  • A ray of light travelling obliquely from a rarer medium to a denser medium goes _______​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!