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
umka21 [38]
2 years ago
12

What fraction of all the electrons in a 25 mg water

Physics
1 answer:
mihalych1998 [28]2 years ago
3 0

Answer:

9.11\times 10^{-15}.

Explanation:

The water droplet is initially neutral, it will obtain a 40 nC of charge when a charge of  -40 nC is removed from the water droplet.

The charge on one electron, \rm e=-1.6\times 10^{-19}\ C.

Let the N number of electrons have charge -40 nC, such that,

\rm Ne=-40\ nC\\\Rightarrow N=\dfrac{-40\ nC}{e}=\dfrac{-40\times 10^{-9}\ C}{-1.6\times 10^{-19}\ C}=2.5\times 10^{11}.  

Now, mass of one electron = \rm 9.11\times 10^{-31}\ kg.

Therefore, mass of N electrons = \rm N\times 9.11\times 10^{-31}=2.5\times 10^{11}\times 9.11\times 10^{-31}=2.2775\times 10^{-19}\ kg.

It is the mass of the of the water droplet that must be removed in order to obtain a charge of 40 nC.

Let it is m times the total mass of the droplet which is 25\ \rm mg = 25\times 10^{-6}\ kg.

Then,

\rm m\times (25\times 10^{-3}\ kg) = 2.2775\times 10^{-19}\ kg.\\m=\dfrac{2.2775\times 10^{-19}\ kg}{25\times 10^{-3}\ kg}=9.11\times 10^{-15}.

It is the required fraction of mass of the droplet.

You might be interested in
11) An airplane is moving at a net force of zero. This means the airplane is
Elden [556K]

Answer:

D. moving slow at a constant speed and traveling along a straight line

3 0
3 years ago
Can I have answers of all these questions?<br> Urgent plz!
Leona [35]
Q3. (a) 0m/s, as they are asking for initial velocit.
(b)(i) The paper has a large surface area or weighs less than the coin,thus,falls smoothly.
(ii)The coin has more mass than the paper.
(c) They fall at the same acceleration and hit the bottom at the same time.
Their mass doesn't matter in the vacuum.
7 0
3 years ago
A 7.0kg object rests on a horizontal frictionless surface. What is the magnitude of the horizontal
sukhopar [10]

Answer:

16.1 N

Explanation:

From the question,

F = ma.............................. Equation 1

Where F = horizontal force, m = mass of the object, a = acceleration .

Given: m = 7.0 kg, a = 2.3 m/s²

Substitute this values into equation 1

F = (7.0×2.3)

F = 16.1 N.

Hence the magnitude of the horizontal force is 16.1 N

6 0
2 years ago
Only the healthy foods we eat provide<br> energy to our body<br> true<br> false
Ilia_Sergeevich [38]

Answer:

True

Explanation:

Yes absolutely the food which provede us energy is termed as healthy..

7 0
3 years ago
Help me please! i will give brainliest i need it done i know its easy but i have a lot of work to do
cricket20 [7]

Answer:

Down below :)

Explanation:

1. Solid - A

2. Liquid - C

3. Gas - E

4. Melting - G

5. Evaporation - F

6. Condensation - D

7. Freezing - B

Hope it is right!

5 0
2 years ago
Read 2 more answers
Other questions:
  • A cylinder shaped jar has a radius of 2 cm and a hight of 6 cm what the volume of the jar
    12·1 answer
  • A bumper has a non negligible mass. After a collision with an ideal spring, the spring is compressed to a distance of 90% of the
    8·1 answer
  • Please answer this questions
    10·1 answer
  • How many millimeter are there in 10 centimeters?
    15·2 answers
  • What’s the answer to this one?
    11·1 answer
  • A _____ accelerates a chemical reaction in a cell.<br> substrate<br> catalyst<br> buffer
    7·2 answers
  • How much energy must be absorbed by water with a mass of 0.5 kg in order to raise the temperature from 30°C to 65°C? Note: Water
    15·1 answer
  • Which of the following is true about the regions of the electromagnetic spectrum?
    5·1 answer
  • Can someone help me in this please any one good in science.
    14·1 answer
  • I have to make a presentation about ultrasound diagnostic (it's for physics). Does someone know more about that topic? I need to
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!