I think wavelength because the radios volume is being turned up.
Your question has no context, nobody’s going to be able to answer it.
If the shopping cart is parallel to the ground, the weight is acting vertically downward, then force is equal to weight. The normal force will be acting perpendicular to the ground,and acting upward opposite of the weight.
Answer:

Explanation:
Given that,
Magnetic field, 
Acceleration of the electron, 
Speed of electron, 
The force due to this acceleration is balanced by the magnetic force as :




So, the angle between the electron's velocity and the magnetic field is 10.6 degrees. Hence, this is the required solution,
That gives you the magnitude of velocity, but it doesn't handle
the directions that are involved.