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riadik2000 [5.3K]
1 year ago
12

An artist has completed 1 4 of a painting in 2 weeks. At what rate is she working? Simplify your answer and write it as a proper

fraction, mixed number, or whole number.
Mathematics
1 answer:
Alika [10]1 year ago
5 0

Answer:

1/8 because 1/4 x 1/2 = 1/8

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2 years ago
What are the magnitude and direction of u+v+w ?
nevsk [136]

The magnitude and the direction of the resultant are approximately 57.871 and 198.676°.

<h3>How to determine the magnitude and the direction of a resultant</h3>

Vectors are elements with two given characteristics: Magnitude and direction. A resultant is derived from the sum of vectors, the magnitude is the norm of a vector and the direction is the orientation of a vector. The resultant and its characteristics are described below:

<h3>Resultant</h3>

\vec r = \left(\sum\limits_{i=1}^{n}x_{i}, \sum\limits_{i=1}^{n}y_{i}\right)     (1)

<h3>Magnitude</h3>

\|\vec r\| = \sqrt{\left(\sum\limits_{i=1}^{n} x_{i}\right)^{2}+\left(\sum\limits_{i=1}^{n} y_{i}\right)^{2}}   (2)

<h3>Direction</h3>

\theta = \tan^{-1}\frac{\sum\limits_{i=1}^{n}y_{i}}{\sum\limits_{i=1}^{n}x_{i}}   (3)

Where \theta is resultant angle, measured in degrees.

If we know that \|\vec u\| = 90, \theta_{u} = 40^{\circ}, \|\vec v\| = 60, \theta_{v} = 20^{\circ}, \|\vec w\| = 40 and \theta_{w} = 30^{\circ}, then the resultant, its magnitude and its direction:

<h3>Resultant</h3>

\vec r = (-90\cdot \cos 40^{\circ}-60\cdot \sin 20^{\circ}+40\cdot \cos 30^{\circ}, 40\cdot \sin 30^{\circ}+60\cdot \cos 20^{\circ}-90\cdot \sin 40^{\circ})

\vec r = (-54.824, 18.531)

<h3>Magnitude</h3>

\|\vec r\| = \sqrt{(-54.824)^{2}+18.531^{2}}

\|\vec r\| \approx 57.871

<h3>Direction</h3>

\theta = \tan^{-1} \left(\frac{18.531}{-54.824}\right)

\theta \approx 198.676^{\circ}

The magnitude and the direction of the resultant are approximately 57.871 and 198.676°. \blacksquare

To learn more on vectors, we kindly invite to check this verified question: brainly.com/question/13322477

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Answer:

Step-by-step explanation:

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