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4 years ago

Why do quarterbacks throw the football with significant spin about its long axis?

Physics

1 answer:

Lera25 [3.4K]4 years ago

7 0

(a) the principle of aerodynamic convergence

(b) the centripetal force

(d) Conservation of kinetic energy

(e) None of these

Conservation of angular momentum

Answer: Option C.

Explanation:

The law of conservation of angular momentum expresses that when no outer torque follows up on an article, no difference in precise force will happen.

The law of conservation of angular momentum expresses that the angular energy of a body that is the result of its snapshot of latency about the hub of revolution and its rakish speed about a similar pivot, can't change except if an outside torque follows up on the framework.

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Suppose you are standing such that a 35-foot tree is directly between you and the sun. If you are 7 feet tall and the tree casts

Juli2301 [7.4K]

Answer:

60 ft

Explanation:

The tree man and their shadow system forms two similar right angle triangles.

the figure is in the attachment.

let ∠BAC= θ

Therefore, in triangle ABC

tanθ = BC/AC= 35/75= 7/15

now in ΔAEF also

tanθ = EF/AE = 7/75-x= 7/15

solving we get x=60 ft

Now AC and FA are the shadows of the tree and the man respectively.

now FA =75-x=75-60= 15 ft

Therefore, the man must stand at a distance of 60 ft from the tree can you stand and still be completely in the shadow of the tree

3 0

4 years ago

A river with a flow rate of 7 m3/s discharges into a lake with a volume of 9,000,000 m3. The concentration of a particular VOC i

soldi70 [24.7K]

Answer:

The concentration downstream reduces to 0.03463mg/L

Explanation:

Initially let us calculate the time it is required to fill the lake, since for that period of time the pollutant shall remain in the lake before being flushed out.

Thus the detention period is calculated as

$t=\frac{V}{Q}\\\\t=\frac{9000000}{7}=1.285\times 10^{6}seconds\\\\\therefore t = 14.872days$

Now the concentration of the pollutant after 14.872 days is calculated as

$N_{t}=N_{0}e^{-kt}$

where

$N_{o}$ is the initial concentration

't' is the time elapsed after which the remaining concentration is calculated

k is the dissociation constant.

Applying values we get

$N_{t}=3\times e^{-0.3\times 14.872}$

$N_{t}=0.03463mg/L$

4 0

3 years ago

Molecules made up of atoms of the same element are ________________ because the atoms are identical. So they share electrons equ

igomit [66]

Nonpolar is the answer

6 0

3 years ago

Air flows upward in the wick of a lantern because of the liquid property called

vovangra [49]

Adhesive.

Adhesive is the force of attraction between molecules of different kind. Liquid flows upward the wick because the adhesive force between the wick and the liquid is higher than cohesive forces in the liquid.

When the adhesive force between the wick and the liquid is high we have capillarity taking place. This cause the liquid to move up the wick.

7 0

3 years ago

A boxed 12.0 computer monitor is dragged by friction 7.50 up along the moving surface of a conveyor belt inclined at an angle of

sasho [114]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

Below is the solution:

W done by Normal = 0. (make the incline flat, Normal force goes directly up: no work done)
W done by gravity = w*displacement = (11kg*9.8) * 7.5sin(35) = -463J 
W done by friction is the opposite of the work done by weight because the object is not moving. Therefore W done by friction = 463J

8 0

4 years ago