Answer:
When a plastic rod is rubbed with a cloth, it becomes charged. Electrons are rubbed off the cloth and onto the rod by friction. This leaves the rod with a negative charge and leaves the cloth with a positive charge.
I am pretty sure the answer to your question is B
The force of friction is 399.7 N
Explanation:
The force of friction acting on the bear is given by
(1)
where
is the coefficient of friction
N is the normal reaction exerted by the plane on the bear
The normal reaction can be found by analyzing the forces acting in the direction perpendicular to the plane: in fact, the bear is in equilibrium along this direction, so the normal reaction must balance the component of the weight perpendicular to the plane:
where:
m = 900 kg is the mass of the bear
is the acceleration of gravity
is the angle of the incline
Substituting everything into (1), we find the force of friction:
Learn more about inclined plane and frictional force here:
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Answer:
electrons
Explanation:
they go through the wires and power our computer tech