3 years ago

"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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What is the main cause of ocean currents? Question 2 options:

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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

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

$v_f = 5.21 m/s$

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

$F = ma$

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so during landing the force will be 6798.5 N

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3 years ago

What is the weight of a 20 kg box on the Earth?<br> A) 2 N <br> B) 20 N<br> C) 200 N

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C 200 Newtons ........

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All life that we know of is based on carbon. Carbon's ability to form many chemical bonds is an important characteristic that al

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4 years ago