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nadya68 [22]
2 years ago
14

A machine has an efficiency of 60%. If the machine is required to overcome a load of 30N with a force of 20N, calculate its mech

anical advantage?​
Physics
1 answer:
skelet666 [1.2K]2 years ago
5 0

Explanation:

eff = m.a/ v.r

m.a = L /E

30/ 20

= 1. 5

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slavikrds [6]

Answer:

(A) 9.5 m/s

(B) 5.225 m

Explanation:

vertical height (h) = 4.7 m

horizontal distance (d) = 9.3 m

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(A) what is the pelicans initial speed ?

  • lets first calculate the time it took the fish to fall

s = ut + (\frac{1}{2}) at^{2}

since u = 0

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t = \sqrt{\frac{2s}{a} }

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t = \sqrt{\frac{2 x 4.7 }{9.8} } = 0.98 s

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speed of the fish = distance / time = 9.3 / 0.98 = 9.5 m/s

initial speed of the pelican = 9.5 m/s

(B) If the pelican was traveling at the same speed but was only 1.5 m above the water, how far would the fish travel horizontally before hitting the water below?

vertical height = 1.5 m

pelican's speed = 9.5 m/s

  • lets also calculate the time it will take the fish to fall

s = ut + (\frac{1}{2}) at^{2}

since u = 0

s =  (\frac{1}{2}) at^{2}

t = \sqrt{\frac{2s}{a} }

where a = acceleration due to gravity and s = vertical height

t = \sqrt{\frac{2 x 1.5 }{9.8} } = 0.55 s

 

distance traveled by the fish = speed x time = 9.5 x 0.55 = 5.225 m

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