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3 years ago

How significant is air resistance for projectile motion?

Physics

1 answer:

miv72 [106K]3 years ago

8 0

Answer:

Air resistance have some significant role in projectile motion if the motion lasts for some time.

Explanation:

Air resistance or air drag seems to be important in daily actvities and games like baseball.

The trajectory of the projectile with or without air resistance or air drag is totally different.

When we neglect air drag, the only acting force is gravity against the motion so the maximum height and range are suppose Hmax and R.

Now, when we consider air drag, it is important to notice that there are two forces against the motion of the ball and along the direction of gravity. It seems that both maximum height and range are lesser Hmax'< Hmax and R'<R.

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3 years ago

A furniture shop refinishes chairs. Employees use one of two methods to refinish each chair. Method I takes 0.5 hours and the ma

satela [25.4K]

Answer:

method I = 88 chairs

method II = 62 chairs

Explanation:

This problem can be modeled by a system of two linear equations.

Define x as the number of chairs refinished by method I and y by method II

The sum of hours spent on both methods should equal 199 and the sum of total material cost should equal $1226, therefore:

$0.5x + 2.5y = 199$

$9x+7y = 1226$

Multiplying the first equation by -18 and adding it to the second equation we can solve for the value of y:

$9x+7y +(-9x - 45)= 1226+(-3582)\\y=\frac{2356}{38} = 62\\$

We can now apply the value of y found to the first equation and solve for x:

$0.5x+2.5*62 = 199\\x=\frac{199 - (2.5*62)}{0.5} = 88$

Therefore, they should refinish 88 chairs with method I and 62 chairs with method II

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3 years ago

Do you think most other people participate in these measures?

Fynjy0 [20]

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4 years ago

Please help!!!!!!!! 25 points

Archy [21]

Answer:

B: beaks, finches.

Explanation:

Beaks, finches. This is because he noticed that fruit-eating finches had beaks similar to parrots, while finches that ate insects had narrow beaks. The difference in their beaks is due to adapting to different environments which causes them to evolve into different species of finches.

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3 years ago

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When an object is at rest, it might have several forces acting on it. however,?

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On the other hand, when an object is at rest, despite the possibility of having several forces acting on it, these forces balance out to a net force of zero which keeps the body still with no motion.

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3 years ago