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seropon [69]
2 years ago
8

Alyse runs to her classroom which is 20 meters away. She forgets her physics book in her locker and must return 20 meters in the

direction from whence she came. If her total trip takes 3 minutes, what is Alyse’s average velocity? NEED HELPP ASAPPPP!!!!!
Physics
1 answer:
notka56 [123]2 years ago
3 0

The average velocity of Alyse is 0 m/s.

<h3>What is the average velocity of an object or a person?</h3>

The average velocity of a person is the average of all the velocities of moving as it moves.

Velocity on its own is the ratio of the displacement of a body and the time taken for that displacement.

Mathematically:

  • Average velocity = total displacement / time taken

Displacement is a vector quantity that measures the distance traveled by a moving body in a specific direction.

Hence, average velocity and velocity are both vector quantities.

Displacement takes a measure of the shortest possible distance along a straight line from the beginning of the motion until the end of the motion.

Calculating the average velocity of Alyse:

Assuming the initial direction is positive and n=backeard direction is negative:

Total displacement = 20 m + - (20 m)

Total displacement = 0 m

total time = 3 minutes

Average velocity = 0 m/ 3

Average velocity = 0 m/s

Learn more about average velocity at: brainly.com/question/4931057

#SPJ1

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Two forces, F? 1 and F? 2, act at a point, as shown in the picture. (Figure 1) F? 1 has a magnitude of 9.20 N and is directed at
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a. Fx = -8.089 N b. Fy = 3.525 N c. 8.824 N d. 336.45°

Explanation:

Since F₁ = 9.2 N and acts at 57° above the negative axis in the second quadrant, its x-component is -F₁cos57° and its y- component is F₁sin57°

Since F₁ = 5.2 N and acts at 53.7° below the negative axis in the third quadrant, its x-component is -F₂cos53.7° and its y- component is -F₂sin53.7°

Part A

What is the x component Fx of the resultant force?

The x component of the resultant force Fx = -F₁cos57° + -F₂cos53.7° = -9.2cos57° + (-5.2cos53.7°) = (-5.011 - 3.078) N = -8.089 N

Part B

What is the y component Fy of the resultant force?

The y component Fy of the resultant force = F₁sin57° + -(F₂sin53.7°) = 9.2sin57° - 5.2sin53.7° = (7.716 - 4.191) N = 3.525 N

Part C  

What is the magnitude F of the resultant force?

The magnitude F of the resultant force = √(Fx² + Fy²)

F = √(-8.089² N + 3.525² N) = √65.432 + 12.426 = √77.858 = 8.824 N

Part D

What is the angle ? that the resultant force forms with the negative x axis?

The angle the resultant force makes with the negative x axis is given by

θ = tan⁻¹(Fy/Fx) = tan⁻¹(3.525/-8.089) = tan⁻¹-0.4358 = -23.55°.

To measure it from the negative x axis, we add 360. So, our angle = 360 -23.55 = 336.45°

7 0
3 years ago
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