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3 years ago

13

Avi, a gymnast, weighs 40 kg. She is jumping on a trampoline that has a spring constant value of 176,400 StartFraction N over m

EndFraction. If she compresses the trampoline 20 cm, how high should she reach? meters

2 answers:

Lina20 [59]3 years ago

7 0

Answer:

9

Explanation:

Because its right!

Fiesta28 [93]3 years ago

6 0

Answer:

9

Explanation:

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aliya0001 [1]

Answer:

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Final elevation = 731.9 m

Explanation:

We are told that temperature of air changes from 0 to 10°C

Thus;

Change in temperature; ΔT = 10 - 0 = 10°C

Also, its velocity changes from zero to a final velocity. Thus;

v1 = 0 m/s

v2 is unknown

Also, its elevation changes from zero to a final elevation.

So, z1 = 0 and z2 is unknown

Now, we want to find v2 and z2 when the internal, kinetic and potential energy are equal.

Thus Equating the formula for both kinetic and internal energy gives;

½m(v2² - v1²) = mc_v•ΔT

m will cancel out and v1 is zero to give;

v2² = 2c_v•ΔT

v2 = √(2c_v•ΔT)

Where c_v is specific heat of constant volume of air with a constant value of 718 J/Kg.K

Thus;

v2 = √(2 × 718 × 10)

v2 = √14360

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mg(z2 - z1) = mc_v•ΔT

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z2 = (c_v•ΔT)/g

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