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Tju [1.3M]
3 years ago
15

Two rock climbers, bill and karen, use safety ropes of similar length. karen's rope is more elastic, called a dynamic rope by cl

imbers. bill has a static rope, not recommended for safety purposes in pro climbing. karen falls freely about 2.0 m and then the rope stops her over a distance of 0.9 m.
Physics
2 answers:
omeli [17]3 years ago
8 0

Answer:

The answer is 2.8 times.

Explanation:

Speed ​​needs to be calculated when Karen completes the 2.0m drop, using the following equation:

V^2 = Vo^2 + 2gd = 0^2 + 2*9.81 m/s^2 * 2.0 m = 39.24 m^2/s^2 => V = 6.26 m/s

From there, the rope has a net force which causes a constant acceleration, which can be calculated according to the equation:

Vo = 6.26 m/s

Vf = 0

Vf^2 = Vo^2 + 2ad => a = [Vf^2 - Vo^2]/2d = [0^2 - (6.26 m/s)^2]/2*(0.9m) = -17.63 m/s^2

That acceleration is due to the difference between the force exerted by the rope and Karen's weight:

Karen's weight = mg

Karen's Weight - String Force = Net Force = ma

mg - chord force = ma

String strength = mg - ma = m (g -a) = m [9.81 m/s^2 - (-17.63m/s^2)] = 27.44m

Dividing by weight:

 27.44m/9.81m = 2.79 = 2.8 times

The answer is three times.

Oliga [24]3 years ago
3 0
You never gave us an answer, so therefore, we can't answer this question.
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To find the answer, we have to know about the Lorentz transformation.

<h3>What is its kinetic energy as measured in the Earth reference frame?</h3>

It is given that, an alien spaceship traveling at 0.600 c toward the Earth, in the same direction the landing craft travels with a speed of 0.800 c relative to the mother ship. We have to find the kinetic energy as measured in the Earth reference frame, if the landing craft has a mass of 4.00 × 10⁵ kg.

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Learn more about frame of reference here:

brainly.com/question/20897534

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