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Licemer1 [7]
3 years ago
11

I NEED HELP PLEASE, THANKS! :)

Mathematics
1 answer:
e-lub [12.9K]3 years ago
6 0

Answer:

  2.908 s

Step-by-step explanation:

The "work" is most easily done by a graphing calculator. We only need to tell it the equation of motion.

For speeds in feet per second, the appropriate equation for vertical ballistic motion is ...

  h(t) = -16t² +v₀t +s₀

where v₀ is the initial vertical velocity in ft/s and s₀ is the initial height in feet. The vertical velocity is the vertical component of the initial velocity vector, so is (65 ft/s)(sin(44°)). We want to find t for h=0.

  0 = -16t² +65sin(44°) +4

Dividing by -16 gives ...

  0 = t^2 -2.82205t -0.2500

Using the quadratic formula, we find ...

  t ≈ (2.82205 ±√(2.82205² -4(1)(-0.25))/2 ≈ 1.41103 +√2.24099

  t ≈ 2.90802

It will take about 2.908 seconds for the discus to reach the ground.

_____

<em>Comment on the question</em>

You're apparently supposed to use the equation for ballistic motion even though we know a discus has a shape that allows it to "fly". It doesn't drop like a rock would.

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LenKa [72]

Answer:

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Step-by-step explanation:

Given that y varies inversely with x then the equation relating them is

y = \frac{k}{x} ← k is the constant of variation

To find k use the condition y = \frac{1}{3} when x = \frac{1}{2} , thus

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When x = \frac{1}{4} , then

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3 years ago
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Rama09 [41]

Answer:

V =\dfrac{25\pi}{\sqrt{2}}

Step-by-step explanation:

given,

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now,

V = \int_a^b(\pi (5\sqrt{sinx})^2)dx

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V =25\pi [-cos (\pi/2)+cos(\pi/4)]

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V =\dfrac{25\pi}{\sqrt{2}}

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4 0
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Step-by-step explanation:

look at the picture !

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Step-by-step explanation:

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