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Alexxandr [17]
2 years ago
13

What kind of mixture is the gravel at the bottom of the fish tank?

Physics
2 answers:
kotegsom [21]2 years ago
7 0
Hey there! I’m Raegan and i believe the answer is “Rock”. Thank you for your time.
adoni [48]2 years ago
6 0

Answer:

rock

Explanation:

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3 years ago
How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−21 n
hichkok12 [17]

Answer:

891 excess electrons must be present on each sphere

Explanation:

One Charge = q1 = q

Force = F = 4.57*10^-21 N  

Other charge = q2 =q

Distance = r = 20 cm = 0.2 m  

permittivity of free space = eo =8.854×10−12 C^2/ (N.m^2)  

Using Coulomb's law,

F=[1/4pieo]q1q2/r^2

F = [1/4pieo]q^2 / r^2

q^2 =F [4pieo]r^2

q =  r*sq rt F[4pieo]

 q=0.2* sq rt[ 4.57 x 10^-21]*[4*3.1416*8.854*10^-12]

q = 1.42614*10^ -16 C

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n =891

 891 excess electrons must be present on each sphere  

5 0
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