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erastovalidia [21]
3 years ago
6

"why did the solar nebula heat up as it collapsed?"

Physics
1 answer:
zubka84 [21]3 years ago
6 0
As the cloud shrank, its gravitational potential energy was converted to kinetic energy and then into thermal energy.
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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
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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

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PART b)

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

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

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F = ma

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