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katrin2010 [14]
3 years ago
13

What unit is represented by the smallest intervals printed on a centimeter ruler?

Physics
1 answer:
Bumek [7]3 years ago
3 0
Millimeter is signified by the least intervals written on a centimeter ruler. A millimeter is a unit of length in the metric method which is equivalent to one thousandth of a meter which is the SI base unit of length. Therefore, there are one thousand millimeters in a meter. There are ten millimeter in a centimeter and one millimeter is equal to 1000 micrometers and precisely 5/127 of an inch. 
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Answer:

If the canoe heads upstream the speed is zero. And directly across the river is  8.48 [km/h] towards southeast

Explanation:

When the canoe moves upstream, it is moving in the opposite direction of the normal river current. Since the velocities are vector (magnitude and direction) we can sum each vector:

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We take the direction of the river as positive, therefore other velocity in the opposite direction will be negative.

Vt = Vr + Vc = 6 - 6 = 0 [km/h]

For the second question, we need to make a sketch of the canoe and we are watching this movement at a high elevation. So let's say that the canoe is located in point 0 where it is located one of the river's borders.

So we are having one movement to the right (x-direction). And the movement of the river to the south ( - y-direction).

Since the velocities are vector we can sum each vector, so using the Pythagoras theorem we have:

Vt = \sqrt{(6)^{2} +(-6)^{2} } \\Vt=8.48[km/h]

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