1. A girl drops a ball off the roof of her house. It takes the ball 2 seconds to hit the ground. How tall
1 answer:
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Answer:
r₂ = 4 r
Explanation:
For this exercise let's use Newton's second law with the magnetic force
F = q v x B
bold letters indicate vectors, the magnitude of this expression is
F = q v B sin θ
in this case we assume that the angle is 90º between the speed and the magnetic field.
If we use the rule of the right hand with the positive charge, the thumb in the direction of the speed, the fingers extended in the direction of the magnetic field, the palm points in the direction of the force, which is towards the center of the circle, therefore the force is radial and the acceleration is centripetal
a = v² / r
let's use Newton's second law
F = ma
q v B = m v² / r
r =
Let's apply this expression to our case.
Proton 1
r = \frac{qB_1}{mv_1}
Proton 2
r₂ =
in the exercise indicate some relationships between the two protons
* v₁ = 2 v₂
v₂ = v₁ / 2
* B₂ = 2B₁
we substitute
r₂ =
r₂ = 4
r₂ = 4 r
Answer:
18.1 V
Explanation:
The electric field between two parallel plates is given by the equation:
where
is the charge surface density
is the vacuum permittivity
For the plates in this problem,
So, the magnitude of the electric field is
Now we can find the potential difference between the plates, which is given by
where
d = 8.0 cm = 0.08 m is the separation between the plates
Substituting,