Which is NOT an example of evidence that shows a chemical reaction occurred?
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The magnetic force (Lorentz force) experienced by the proton in the magnetic field is given by
since
, because the velocity v and the force F in this problem are perpendicular, and so also the angle 
between the velocity and the magnetic field B should be 
.
Let's find the magnitude of the magnetic field; this is given by
To understand the direction, let's use the right-hand rule:
-index finger: velocity
- middle finger: magnetic field
- thumb: force
Since the velocity (index) points east and the force (thumb) points south, then the magnetic field (middle finger) points downwards. So we write:
B = -0.091 T
since
Let's find the magnitude of the magnetic field; this is given by
To understand the direction, let's use the right-hand rule:
-index finger: velocity
- middle finger: magnetic field
- thumb: force
Since the velocity (index) points east and the force (thumb) points south, then the magnetic field (middle finger) points downwards. So we write:
B = -0.091 T
The initial angular speed of the wheel is (keeping in mind that 
):
The final angular speed instead is:
Therefore we can find the value of the angular acceleration:
and the negative sign is due to the fact the wheel is decelerating.
The final angular speed instead is:
Therefore we can find the value of the angular acceleration:
and the negative sign is due to the fact the wheel is decelerating.