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KengaRu [80]
2 years ago
14

Lora (of mass 54 kg) is an expert skier. She

Physics
1 answer:
omeli [17]2 years ago
6 0

The mechanical energy at top =Mechanical energy at bottom

  • Mass=m=54kg
  • Height=h=51m
  • Acceleration due to gravity=g=10m/s^2
  • Velocity=v=2.6m/s

\\ \tt\longmapsto M_{initial}=M_{Final}

  • Final energy at bottom=The kinetic energy

\\ \tt\longmapsto KE=M_{initial}

\\ \tt\longmapsto KE=P.E_{(Top)}+K.E_{(Top)}

\\ \tt\longmapsto K.E=mgh+\dfrac{1}{2}mv^2

\\ \tt\longmapsto K.E=m\left(gh+\dfrac{v^2}{2}\right)

\\ \tt\longmapsto K.E=54\left((10)(51)+\dfrac{2.6^2}{2}\right)

\\ \tt\longmapsto K.E=54\left(510+\dfrac{6.76}{2}\right)

\\ \tt\longmapsto K .E=54(510+3.38)

\\ \tt\longmapsto K.E=54(513.38)

\\ \tt\longmapsto K.E=27722.52J

\\ \tt\longmapsto K.E=27.7KJ

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Softa [21]

Answer:

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8 0
2 years ago
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Neko [114]

Yes, yes, we know all of that.  It certainly took you long enough to
get around to asking your question.

If
     a = (14, 10.5, 0)
and
     b = (4.62, 9.45, 0) ,

then, to begin with, neither vector has a z-component, and they
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Their dot-product  a · b = (14 x 4.62) + (10.5 x 9.45) =

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I feel I earned your generous 5 points just reading your treatise and
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7 0
3 years ago
What is work? How much work is done to move an object 0 meters?
yKpoI14uk [10]
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3 years ago
A bullet with a mass of 0.3 kg is fired out of a gun with a mass of 4 kg at 600 m/s. What is the recoil velocity on the gun?
slavikrds [6]

Answer:

According to the Conservation of Momentum,

Momentum of the gun = momentum of the bullet

M(gun)×V(gun)=m(bullet)×v(bullet)

4kg × V = 0.3kg × 600m/s²

V = (0.3 × 600)/4 = 45 m/s

The recoil velocity on the gun is <em><u>45 m/s</u></em>

<h3><u>45 m/s</u> is the right answer.</h3>
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This answer should be gas
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