Answer:
Joule’s law of heating states that when a current ‘i ' passes through a conductor of resistance ‘r’ for time ‘t’ then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.
H = i 2 rt
The reason behind the heat produced is the collision of the free electrons with the lattice ions or atoms while accelerating in presence of the external electric field.
we know that
volt= work done/ total charge or v = w/q
from this we get w= vq
we know that current i = q / t
so q = it
putting this in prev equation
we get w = vit
from ohms law v = ir
putting it in prev eq we get
w = irit = i2rt joule as work is stored as heat soH = I2RT Joules
if a current carrying conductor having resistance (r) gets heated by to passing of current (i) for time (t) and the heat thereby produced be H
joules law states that
H propotional to i^ 2 when r and t are constant
H propotional to r when I and t are constant
H propotional to t when r and I constant
Answer:
The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It spun faster and faster, forming the Sun.
Explanation:
hope this helps
Answer:
75.5°
Explanation:
If we say F₁ is horizontal (0°), and F₂ is at angle θ, then the components are:
F₁ₓ = 2
F₁ᵧ = 0
F₂ₓ = 3 cos θ
F₂ᵧ = 3 sin θ
So the components of the resultant vector are:
Rₓ = 2 + 3 cos θ
Rᵧ = 3 sin θ
We know the magnitude of R, so using Pythagorean theorem:
4² = (2 + 3 cos θ)² + (3 sin θ)²
16 = 4 + 12 cos θ + 9 cos² θ + 9 sin² θ
16 = 4 + 12 cos θ + 9
3 = 12 cos θ
cos θ = 1/4
θ ≈ 75.5°
Alternatively, you can draw a diagram and use law of cosine to find the internal angle, then subtract from 180 to find θ.
