2. Kevin is a member of the school's track and field team. His favorite event is throwing the shot
1 answer:
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Answer: momentum afterwards = 1040.4kgm/s
Explanation:
,
where
is the current;
is the drift speed;
is the cross-section area of the wire,
is the number of charge carrier per unit volume, and
is the charge on each charge carrier.
Area of a circular cross-section:
,
where
is the radius of the wire.
and
are the same for all four samples, for they are made out of the same material.
As a result, of each wire is directly proportional to
where the value of
is constant.
For each of the four wires:
.
How do the four wires rank by their current?
d > a > b > c.
Answer:
Explanation:
At the bottom the tension would be upwards and the weight downwards, their difference being the centripetal force. Taking the upwards direction as positive we then have:
where we have used the equation for centripetal acceleration. Thus we have: