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Lyrx [107]
3 years ago
8

A) a 50 kg gymnast jumps from the balance beam with a speed of 1.7m/s. she lands upright on the ground 124cm below. At what spee

d will she hit the ground
B) On landing she bends her knees through a height of 0.1m determine the average force exerted by her legs during the landing
Physics
1 answer:
ivolga24 [154]3 years ago
5 0

PART a)

By energy conservation we can say

PE_i + KE_i = PE_f + KE_f

mgh_1 + \frac{1}{2}mv_i^2 = mgh_2 + \frac{1}{2}mv_f^2

divide whole equation by mass "m" and plug in all given data

9.8(1.24) + \frac{1]{2}(1.7)^2  = 9.8(0) + \frac{1}{2}(v)^2

v_f = 5.21 m/s

so gymnast will reach the floor with speed 5.21 m/s

PART b)

Now the gymnast bend her knees by 0.1 m and comes to rest

so here we will have

v_f^2 - v_i^2 = 2 a d

0 - 5.21^2 = 2(a)(0.1)

a = 135.97 m/s^2

now the force on the gymnast will be

F = ma

F = 50 \times 135.97 = 6798.5 N

so during landing the force will be 6798.5 N

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A train is traveling north. it goes 200 km /hr for 2.5 hours how far did the train go.
PSYCHO15rus [73]
<h3>Answer: 500 Kilometers</h3>

Explanation:

The formula for finding distance is: speed × time

We must multiply:

200Km/h × 2.5 hours

This gives you 500 Km.

<u>Remember: the formula to work out the distance -  speed x time.</u>

If the train speed is 200 km/h, it travels 200 km/h.

Now, we must multiply 200 by 2.5:

200 x 2.5 = 500

Our answer is 500 Kilometers.

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2 years ago
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In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 4.32 x 104-m length of wire
elena55 [62]

Answer:

Explanation:

Length, l = 4.32 x 10^4 m

speed, v = 7.07 x 10^3 m/s

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The formula for the motion emf is given by

e = B x v x l

e = 5.81 x 10^-5 x 7.07 x 10^3 x 4.32 x 10^4

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What is a partial and total lunar eclipse?
Minchanka [31]

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Total Lunar Eclipse:

The three celestial bodies are perfectly aligned which allows for the earth to completely block the sun's rays from hitting/reaching the moon. The sun is positions is in back of the Earth which then causes the shadow of the earth to be cast on the Moon covering the moon completely. When that happens you get the phenomenon called a total lunar eclipse.

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7 0
2 years ago
A coiled telephone cord forms a spiral with 90.0 turns, a diameter of 1.30 cm, and an unstretched length of 57.0 cm. Determine t
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Answer:

2.36 μ H

Explanation:

Given,

Number of turns= 90

diameter = 1.3 cm = 0.013 m

unscratched length = 57 cm  = 0.57 m

Area, A = π r²

            = π x 0.0065² = 1.32 x 10⁻⁴ m²

 we know,

   L = \dfrac{\mu_0N^2A}{l}

   L = \dfrac{4\pi \times 10^{-7}\times 90^2\times 1.32\times 10^{-4}}{0.57}

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Hence, the inductance of the unstretched cord is equal to 2.36 μ H

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3 years ago
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