Answer:
1. Some molecular substances are electrolytes
Explanation:
Electrolytes are electrically conducting solutions when dissolved in water and are found in cells .
In this case , all molecular substances can’t be electrolytes
Not all electrolytes are ionic. They could be ionic or covalent.
A strong electrolyte is known for its complete ionization in water and not for anything partial.
Answer: r = 1.33 × 10^-5 mm
Explanation: The force per unit length of 2 current carrying conductor is given by the formulae below.
F/L = (u×I1×I2) /(2πr)
Where F/L = force per unit length = 7.73×10^-5mm = 0.0775 mm.
I1 = current on the first conductor = 4.27A
I2 = current on the second conductor = 1.19A
r = distance between both conductors.
u = permeability of free space = 1.25×10^-6
By substituting parameters, we have that
0.0775 = 1.25×10^-6 × 4.27 × 1.19/ 2πr
By cross multiplication
0.0775 ×2πr = 1.25×10^-6 × 4.27 × 1.19
r = 1.25×10^-6 × 4.27 × 1.19/ 0.0775 ×2π
r = 0.00000635162 / 0.0775 ×2π
r = 1.33 × 10^-5 mm
Hydrogen makes stars and stars spend most of their lifetime making helium.
The heavier elements are made when an old-age, high mass star explodes as a nova or supernova and then dies.
Answer:
u =0.269
Explanation:
To find the coefficient of friction we know the following formula
Where
= Force of Friction
= Coefficient of Friction
= Normal Force
Thus we first find the Normal force (N). Remember that the Normal force is perpendicular to the surface, and is equal to the opposing component of Weight (W). Since the surface here is horizontal, then the Normal force will be equal to the Weight.
Now we find the Force on the spring that caused the extension of 3.25cm or 0.0325m
Where
= Force of Friction
= Force Constant
= extension
Hence
Now to find the coefficient of friction we use the first formula