Density is mass over volume. Density is also a charecteristic property wich defines a substance and two different substance cant have the same charasteristic property.
Answer:
r=0.127
Explanation:
When connected in series
Current = I
When connected in parallel
Current = 10 I
We know that equivalent resistance
in parallel R= R₁R₂/(R₂+ R₁)
In series R = R₁+R₂
Given that voltage is constant (Vo)
We also know that relationship between voltage ,current and resistance
V = I R
Vo = I (R₁+R₂) ------------1
Vo = 10 I (R₁R₂/(R₂+ R₁)) -------2
From above equations
10 I (R₁R₂/(R₂+ R₁)) = I (R₁+R₂)
10 R₁R₂ = (R₁+R₂) (R₂+ R₁)
10 R₁R₂ = 2 R₁R₂ + R₁² + R₂²
8 R₁R₂ = R₁² + R₂²
Given that
r = R₁/R₂
Divides by R₂²
8R₁/R₂ = ( R₁/R₂)²+ 1
8 r = r ² + 1
r ² - 8 r+ 1 =0
r= 0.127 and r= 7.87
But given that R₂>R₁ It means that r<1 only.
So the answer is r=0.127
I think it’s b amplitude and wavelength
Answer : The excess of electrons on the penny are, 
electrons
Solution : Given,
Total charge = 
Charge on electron = 
Formula used :
Now put all the given values in this formula, we get the excess of electrons present on the penny.
Therefore, the excess of electrons on the penny are, electrons
d = total displacement of the person running due east = 15 km
t = time taken by the person to travel the given distance due east = 2.0 hr
v = average velocity of the person in east direction = ?
average velocity is the ratio of total displacement to total time taken. hence
average velocity = total displacement/total time
v = d/t
inserting the values
v = 15 km/2.0 hr
v = 7.50 km/hr
