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3 years ago

a child is sliding down a slide at the playground. is the mechanical entertainment conserved? why or why not?

Physics

2 answers:

saveliy_v [14]3 years ago

5 0

Answer: No. Some energy is lost due to friction.

Explanation:

Practically, when a child is sliding at the playground, the potential energy at the top of the slide converts to kinetic energy at the bottom but not completely. On the way down, due to friction between the child and the slide surface, some energy is lost. Thus, mechanical energy which is sum of potential energy and kinetic energy is not conserved in the given situation.

notka56 [123]3 years ago

3 0

The answer is b
id say its lost because you have to push yourself to start moving down the slide, so theres some lost to friction
hope you pass with a 100 A
hope this is right and helps

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Answer:

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b) For a constant speed of 30 m/s, the magnitude of the force is 1,037 N

Explanation:

<em>NOTE: The question b) will be changed in other to give a meaningful answer, because it is the same speed as the original (the gallons would be 1.9, as in the original).</em>

Information given:

d = 106 km = 106,000 m

v1 = 28 m/s

G = 1.9 gal

η = 0.3

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a) We can express the energy used as the work done. This work has the following expression:

$W=F\cdot d$

Then, we can derive the magnitude of the force as:

$F=\frac{W}{d}=\frac{\eta\cdot (G\cdot Eff)}{d}=\frac{0.3*1.9*(1.8*10^8)}{106*10^3} =968\,N$

b) We will calculate the force for a speed of 30 m/s.

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2 years ago

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2 years ago

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Answer:

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Explanation:

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