Step-by-step explanation:
This can be solved a couple of ways. One way is to use the Pythagorean theorem to write equations for the magnitude from the components of the forces. That is what was done in the graph here.
Another way is to use the Law of Cosines, which lets you make direct use of the angle between the vectors.
.. 13 = a^2 +b^2 -2ab*cos(90°)
.. 19 = a^2 +b^2 -2ab*cos(120°)
Subtracting the first equation from the second, we have
.. 6 = -2ab*cos(120°)
.. ab = 6
Substituting this into the first equation, we have
.. 13 = a^2 +(6/a)^2
.. a^4 -13a^2 +36 = 0
.. (a^2 -9)(a^2 -4) = 0
.. a = ±3 or ±2
The magnitudes of the two forces are 2N and 3N, in no particular order.
The answer would be 25...
Think about it, switch 25 with z
Answer 25 - 3 = 22
Correct
unit rate of speed is 0.27 miles per minute .
<u>Step-by-step explanation:</u>
Here we have , it took marjorie 15 minutes to drive from her house to her daughter's school. If the school was 4 miles away from her house, We need to find what was her unit rate of speed . Let's find out:
We know that , ...........(1)
According to question we have following parameters as :
Putting these value in equation (1) we get:
⇒
⇒
⇒
⇒
Therefore , unit rate of speed is 0.27 miles per minute .