jimmyjimjim
13.02.2020 •
Physics
Lucy boards a crowded bus as it sits in the station. There are no available seats, so Lucy stands in the center aisle next to a support pole. As the bus starts moving forward and picks up speed, Lucy holds the pole tightly to avoid falling over backward. While the bus is speeding up, what is the direction of the total force (if any) on Lucy?
Is it forward? baclwards? or the total force is zero?
As the bus drives down a straight road at a constant speed, Lucy has no trouble keeping her balance. During this time, what is the direction of the total force (if any) on Lucy?
Is it forward? baclwards? or the total force is zero?
The bus comes to a sudden stop at a red light, and Lucy grips the pole tightly to avoid falling over forward. During this time, what is the direction of the total force (if any) on Lucy?
Is it forward? baclwards? or the total force is zero?
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Ответ:
F = - 6.95 10⁻² j^ N
Explanation:
The force on a wire carrying current through a magnetic field is
F = i L x B
The bold letters indicate vectors, as the wire is in the positive Z axis and the magnetic field in the negative x axis, the force must be in the negative y axis
the force module
F = i LB
that there is 90º between the two vectors and the sin 90 = 1
let's calculate
F = 4.9 3.3 10⁻² 0.43
F = 6.95 10⁻² N
the force vector is
F = - 6.95 10⁻² j^ N