Answer:
1081.9 J
Explanation:
In order to calculate how much energy is converted into thermal energy due to friction, we have to calculate the difference between the mechanical energy of the child at the top and at the bottom of the slide.
At the top of the slide, he is at rest, so its kinetic energy is zero, and so he only has gravitational potential energy. Therefore:
where
m = 24 kg is the mass of the child
g = 9.8 m/s^2 is the acceleration of gravity
h = 5 m is the height relative to the ground
At the bottom of the slide, the child has only kinetic energy, so its total energy is
where
v = 2.8 m/s is the final speed of the child
Therefore, the therma energy generated due to friction is equal to the difference between the initial and final energy:
The characteristics of stars that can be determined by analyzing a star's spectrum - Doppler shift, temperature, size, composition, and rotation.
1- Rotation: The star's rotation creates a broadening of the spectral lines, which can be used to determine the star's rotation.
2- Temperature: Measure the relative strengths of spectral lines to determine a star's spectral class which corresponds to temperature.
3- Doppler shift: The Doppler shift of the star is determined by its radial velocity.
4- Size: Measure the width of spectral lines. If the lines are narrow, the star's diameter is large. If the lines are wider, the star's diameter is smaller.
5- Composition: Computer models and temperature are used to determine elemental abundances from relative strengths of absorption lines in a star's spectrum.
Learn more about spectrum on:
brainly.com/question/6836691
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Answer:
Mintu should have chosen material with lower specific heat.
Hope this is useful!! <3