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]
4 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]4 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
A person exerts a 19-N force on a cart attached to a spring and holds the cart steady. The cart is displaced 0.060 m from its eq
Mariana [72]

To solve this problem, apply the concepts related to Hooke's law. From there we will find the spring constant. Subsequently, applying Energy balance, which includes gravitational potential energy, elastic potential energy and kinetic energy, we will bury the system's energy. Finally, using the displacement expression for the simple harmonic movement, we will find the expression that describes the system.

PART A) The expression for the spring force is

F=kx

Here,

k = Spring constant

x = Displacement

Rearranging to find the spring constant we have that

k = \frac{F}{x}

k = \frac{19}{0.06}

k = 316.66N/m \approx 320N/m

PART B ) The gravitational potential energy acts on the spring holds the cart is zero. Since cart is placed in the equilibrium position. The kinetic energy of the cart is zero.  Therefore the expression for the total energy is,

E = (PE)_g+(PE)_{spring}+KE

E = 0+\frac{1}{2} kx^2+0

E = \frac{1}{2} (316.66N/m)(0.06)^2

E = 0.569J \approx 0.57J

PART C) The expression for the angular frequency is

\omega = 2\pi f

\omega = 2\pi (1Hz)

\omega = 2\pi rad/s

The equation for the motion of the cart is

x(t)= Acos(\omega t)

Replacing,

x(t) = 0.06 cos (2\pi t)

5 0
3 years ago
Which feature of a heating curve indicates a change of state
ziro4ka [17]

Answer:

The diagonal or the inclined lines shows the changes in terms of temperature, and the horizontal lines shows the changing of phases.

Explanation:

hope it is useful

3 0
3 years ago
5. The value of a car decreases by 15% each
Kazeer [188]

Answer:

the car is worth $2,400

Explanation:

6000*15%=900

900*4=3600

6000-3600=2400

6 0
3 years ago
A body with a mass of 5 Kg has the same kinetic energy as a second body. The second body has a mass of 10 kg and is moving at a
vitfil [10]
First body:

E_{k_1}=\frac{1}{2}.m.v^2\\
\\
E_{k_1}=\frac{1}{2}.5.v_1^2=\frac{5}{2}.v_1^2

Second body:

E_{k_2}=\frac{1}{2}.m.v_2^2\\
\\
E_{k_2}=\frac{1}{2}.10.(20)^2=2.000 \ J

From description of the task we have:

E_{k_1}=E_{k_2}\\
\\
\frac{5}{2}.v_1^2=2.000 \ J\\
\\
5.v_1^2=4.000 \ J\\
\\
v_{1}^2=800 \ J\\
\\
v_{1}= \sqrt{800} \ J \approx 28,3 \ m/s
7 0
3 years ago
The pesticide DDT was first made by a chemical company in 1939 and became widely used worldwide. Evidence that DDT builds up in
Anna71 [15]

It worked

DDT or Dichlorodiphenyltrichloroethane is a kind of pesticide that's colorless and tasteless in form. It has been a known pesticide used for agricultural purposes in the US.It was banned because of its known effects and impact to both humans and other living organisms. A book published by Rachel Carson entitled "Silent Spring" exposed the truth that DDT can cause cancer to humans and is an agricultural threat to wildlife, particularly birds like the bald eagle and the peregrine falcon who were almost near-extinction before the said pesticide was banned.



4 0
3 years ago
Read 2 more answers
Other questions:
  • Anyone tell me what is the physics​
    10·1 answer
  • What is the maximum torque on a 150-turn square loop of wire 18.0 cm on a side that carries a 50.9 A current in a 1.60 T field
    6·1 answer
  • Friend says that temperature increases as altitude increases because you’re moving closer to the sun. Is this true? Explain.
    7·2 answers
  • I am starting out as a pilot. What single engine make of airplane should I get (Cheaper to bye one and train than to rent it)?
    7·2 answers
  • if 6.75g of oxide of lead was reduced to 6.12g of metal, calculate the empirical formula of the oxide​
    5·1 answer
  • I NEED HELP SOLVING THIS!!!!!!!!!!!!
    8·1 answer
  • Giving brainliest!
    8·1 answer
  • More crossword cr a p! :D (Science)
    8·1 answer
  • A block with a mass of 0.26 kg is attached to a horizontal spring. The block is pulled back from its equilibrium position until
    10·2 answers
  • * THE ANSWER IS D * Silicon (chemical symbol Si) is located in Group 14, Period 3. Which is silicon most likely
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!