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antoniya [11.8K]
3 years ago
10

He wrote a book of aerobics

Physics
2 answers:
vampirchik [111]3 years ago
4 0

Answer:

George Washington

Explanation:

ifk

GaryK [48]3 years ago
3 0

Answer:

kenneth H. cooper sorry i need 20 mores letters

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A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this spe
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5 0
4 years ago
Read 2 more answers
A plane leaves the airport in Galisteo and flies 160 km at 66.0 ∘ east of north; then it changes direction to fly 260 km at 49.0
user100 [1]

<u>The question doesn't have any particular requirement, but we'll compute the displacement of the plane from its initial and final landing point in the pasture </u>

Answer:

\displaystyle |\vec{r}|=321.464\ km

\displaystyle \theta =-19.395^o

Explanation:

<u>Displacement </u>

The vector displacement \vec r is a measure of the change of position of a moving object. The displacement doesn't depend on the path followed, only on the final and initial positions. Its scalar counterpart, the distance, does measure the total space traveled and considers all the changes in the direction taken by the object. To find the displacement, we must add all the particular displacements by using vectors.

The plane first flies 160 km at 66° east of north. To find the vector expression of this displacement, we must know the angle with respect to the East direction or North of East. Knowing the angle East of North is 66°, the required angle is 90°-66°=34°

The first vector is expressed as

\displaystyle \vec{r_1}=\left \langle 160^o\ cos34^o, 160\ sin34^o \right \rangle

\displaystyle \vec{r_1}=\left \langle 132.646, 89.471 \right \rangle

The second displacement is 260 km at 49° South of East. This angle is below the horizontal respect to the reference, thus we use -49°.  

The second vector is expressed as:

\displaystyle \vec{r_2}=\left \langle 260\ cos(-49^o), 260\ sin(-49^o)\right \rangle

\displaystyle \vec{r_2}=\left \langle 170.575,-196.224\right \rangle

The total displacement is computed as the vectorial sum of both vectors

\displaystyle \vec{r}=\vec{r_1}+\vec{r_2}=\left \langle 132.646+170.575\right \rangle+ \left \langle89.471-196.224\right \rangle

\displaystyle \vec{r}=\left \langle 303.221,-106.753\right \rangle\ km

The magnitude of the total displacement is

\displaystyle |\vec{r}|=\sqrt{303.221^2+(-106,753)^2}

\displaystyle |\vec{r}|=321.464\ km

And the direction is

\displaystyle tan\ \theta =\frac{-106.753}{303.221}=-0.352

\displaystyle \theta =-19.395^o

6 0
3 years ago
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