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
larisa86 [58]
3 years ago
5

What is the charge of an atom with 20 protons and 18 electrons?

Physics
2 answers:
aev [14]3 years ago
8 0
The answer is 2+ because I just know it’s easy
aleksandr82 [10.1K]3 years ago
3 0
The charge is +2

20-18=2
You might be interested in
A student witnesses a flash of lightning and then t=2.5s later the student hears assiciated clap of thunder. (please show work)
frosja888 [35]

Answer:

857.5 m

2.8583×10⁻⁶ seconds

Explanation:

Time taken by the sound of the thunder to reach the student = 2.5 s

Speed of sound in air is 343 m/s

Speed of light is 3×10⁸ m/s

Distance travelled by the sound = Time taken by the sound × Speed of sound in air

⇒Distance travelled by the sound = 2.5×343 = 857.5 m

⇒Distance travelled by the sound = 857.5 m

Time taken by light = Distance the light travelled / Speed of light

\text{Time taken by light}=\frac{857.5}{3\times 10^8}\\\Rightarrow  \text{Time taken by light}=2.8583\times 10^{-6}

Time taken by light = 2.8583×10⁻⁶ seconds

3 0
3 years ago
Humans and fish brains are similar because they both have a?
velikii [3]

Answer:

it is because they can store and retrieve informatiion just like human beings

4 0
3 years ago
If you can swim in still water at 0.5m/s, the shortest time it would take you to swim from bank to bank across a 20m wide river,
expeople1 [14]

Answer:

t=40s,

Explanation:

If you can swim in still water at 0.5m/s, the shortest time it would take you to swim from bank to bank across a 20m wide river, if the water flows downstream at a rate of 1.5m/s, is most nearly:

from the question the swimmer will have a velocity which is equal to the sum of the speed of the water and the velocity to swi across the bank

Vt=v1+v2

the time is takes to swim across the bank will be

DY=Dv*t

DY=distance across the bank

Dv=ther velocity of the swimmer across the bank

t=20/ 0.5m/s,

t=40s, time it takes to swim across the bank

velocity is the rate of displacement

displacement is distance covered in a specific direction

4 0
3 years ago
Read 2 more answers
Two separate masses on two separate springs undergo simple harmonic motion indefinitely (the surface is frictionless). In CASE 1
Artemon [7]

Answer:

\frac{F_1}{F_2} =\frac{1}{2}

Explanation:

Assuming the we have to find ratio maximum forces on the mass in each case

we know that in a spring mass system

F= Kx

K= spring constant

x= spring displacement

Case 1:

F_1=2k\times d

case 2:

F_2=2k\times 2d

therefore, \frac{F_1}{F_2} = \frac{2K\times d}{2K\times 2d}

\frac{F_1}{F_2} =\frac{1}{2}

4 0
3 years ago
Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the ch
Softa [21]

Answer:

C. The superposition principle

Explanation:

:)

7 0
3 years ago
Read 2 more answers
Other questions:
  • A student is running at her top speed of 5.4 m/s to catch a bus, which is stopped at the bus stop. When the student is still a d
    13·1 answer
  • A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products is cal
    6·2 answers
  • When are the displacement and acceleration equal to zero for the motion of a mass on a spring?
    14·1 answer
  • A point charge q = +4.50 nC moves through a potential difference ΔV = Vf − Vi = +27.0 V. What is the change in the electric pote
    10·1 answer
  • What quantity resists change in motion
    6·1 answer
  • a ball is thrown inclined in to the air with a initial velocity of u. if it reaches the maximum height in 6 seconds , find the r
    11·1 answer
  • Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple. Which of
    10·2 answers
  • Differentiate between the factor(s) that affect inertia and momentum.
    13·1 answer
  • A body weighs less inside water​
    7·1 answer
  • What is the purpose of the scapula to move during arm elevation?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!