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earnstyle [38]
3 years ago
15

A machinist is required to manufacture a circular metal disk with area 1300 cm2. (a) What radius produces such a disk

Physics
1 answer:
vichka [17]3 years ago
6 0

Answer:

Radius r = 20.34 cm

The radius that can produces such a disk is 20.34 cm

Explanation:

Area of a circle;

A = πr^2

A = area

r = radius

Making r the subject of formula;

r = √(A/π) ........1

Given;

A = 1300 cm^2

Substituting into the equation 1;

r = √(1300/π)

r = 20.34214472564 cm

r = 20.34 cm

The radius that can produces such a disk is 20.34 cm

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Answer: minimum speed of launch must be 7.45m/s

Explanation:

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Height or distance (s) = 2.83m

The final velocity(Vf) at maximum height = 0

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From the 3rd equation of motion:

V^2 = u^2 - 2gs

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u = √0 + 55.468

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A 0.90-kg falcon is diving at 28.0 m/s at a downward angle of 35° . It catches a 0.325-kg pigeon from behind in midair. What is
pashok25 [27]

Answer:

22.11 m / s

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momentum = .9 ( 28 cos 35 i - 28 sin 35 j  )

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( .9 + .325) V = 20.64 i - 14.45 j +2.275 i

V = ( 22.915 i - 14.45 j ) / 1.225

= 18.70 i - 11.8 j

magnitude of V

= √ [  (18.7 )² + ( 11.8 )²]

= 22.11 m / s

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