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2 years ago

9

three students make the following claims about determining the average speed and average velocity of the object over the entire

time interval depicted in the graph below … which claim is correct?

1 answer:

Mashcka [7]2 years ago

5 0

Answer:

D. none of them po

Explanation:

pl give me points 73

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The ratio of the lift force L to the drag force D for the simple airfoil is L/D = 10. If the lift force on a short section of th

Yuri [45]

Answer:

$R=64.32\ lb\\\\\theta=84.3\°$

Explanation:

Given:

Ratio of lift force to drag force is, $\frac{L}{D}=10$

Lift force on a short section is, $L=64\ lb$

Magnitude of resultant, $R= ?$

The angle of 'R' with the horizontal is, $\theta=?$

We know that, lift force and drag are at right angles to each other. So, the resultant can be computed using Pythagoras theorem.

For calculating 'R', we first compute drag force 'D'.

As per question:

$\frac{L}{D}=10\\\\D=\frac{L}{10}=\frac{64\ lb}{10}=6.4\ lb$

Now, the magnitude of resultant 'R' is given as:

$R=\sqrt{L^2+D^2}$

Plug in the given values and solve for 'R'. This gives,

$R=\sqrt{64^2+6.4^2}\\\\R=\sqrt{4096+40.96}\\\\R=\sqrt{4136.96}=64.32\ lb$

Therefore, the magnitude of the resultant force 'R' is 64.32 lb.

Now, the angle $\theta$ is given as the arctan of the ratio of the lift and drag force.

Therefore,

$\theta=\tan^{-1}(L/D)\\\\\theta=\tan^{-1}(10)\\\\\theta=84.3\°$

Therefore, the angle made with the horizontal is 84.3°.

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2 years ago

The distance and direction between starting and ending positions

rodikova [14]

Answer:

The length traveled by an object moving in any direction or even changing direction is called distance. The location of an object in a frame of reference is called position. For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement

Explanation:

good luck

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2 years ago

If the magnification produced by a lens has a negative value, the image will be

drek231 [11]

Answer:

I think it's B, not quite sure tho.

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Playing with a stress ball you squeeze it as

shutvik [7]

Answer:

it dies

Explanation:

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What tool could help a biologist study the movements of cells? digital camera with a zoom lens a satellite with a digital camera

Annette [7]

I think your answer would be (D) microscope with a video camera
Hope i helped!

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2 years ago

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