Hi there!
p(a∩b) = 0.
Since a and b are mutually exclusive events, there is no overlap or intersection of events.
These two events CANNOT both occur, so the intersection of p(a) and p(b) does not exist.
Thus, p(a∩b) = 0.
Answer:
True
Explanation:
It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies.
- Hyperphysics
Acceleration i believe is the answer
Explanation:
Below is an attachment containing the solution.
Answer:
B = 4.41 10⁻⁴ T
The direction of the magnetic field is perpendicular to the speed in such a way that if the force is in the clokwise direction
Explanation:
For this problem let's use Newton's second law where the force is magnetic
F = ma
the magnetic force is
F = q v x B
The bold are vectors, as they indicate that the magnetic field and velocity are perpendicular the magnitude of the force is
F = q v B
acceleration is centripetal
a = v² / r
we substitute
q v B = m v² / r
B = m v / q r
Since the velocity modulus is constant, we can use the relation of uniform motion with the time of a lap that we call period (T)
v = d / t
the length of the circle is
d = 2π r
v = 2π r / T
we substitute in the magnetic field equation
B = m /qr (2π r / T)
B = m/q 2π / T
we calculate
B = 2 9.1 10⁻³¹ / 2 1.6 10⁻¹⁹ 2π / 81 10⁻⁹
B = 4.41 10⁻⁴ T
The direction of the magnetic field is perpendicular to the speed in such a way that if the force is in the clokwise direction, for example if the speed goes on the positive axis the field goes up