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Juli2301 [7.4K]
3 years ago
12

A little girl slid down a playground slide, decreasing her potential energy by 1000 J while increasing her kinetic energy by onl

y 900 J. Why did she lose 100 J of mexhanical energy
Physics
2 answers:
Kaylis [27]3 years ago
8 0

Answer:

Due to friction, 100 joules were lost in the form of heat energy

Explanation:

The law of conservation of energy states that

<em>"Energy can neither be created or nor destroyed but rather it changes from one form to another"</em>

As the little girl was sliding down the playground slide, her potential energy was decreasing and at the same time her kinetic energy was accumulated. As we know there is friction in the slide and because of this not all of the of potential energy is converted into kinetic energy. Some of the energy will be lost due to friction taking the form of heat. Therefore, the 100 joules of energy was lost in the form of heat due to friction of the slide.

koban [17]3 years ago
5 0

Answer:

Explanation:

This is because The 100 J of potential energy that doesn't go into increasing her kinetic energy goes into thermal energy—heating her bottom and the slide.

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3 years ago
It takes 52,000 Joules to heat a cup of coffee to boiling from room temperature. How long a piece of 20 cm wide Aluminum foil wo
vovikov84 [41]

Answer:

L = 1.11 x 10^{6} m, is the length of piece of 20 cm wide Aluminum foil to make capacitor large enough to hold 52000 J of energy.

Explanation:

Solution:

Data Given:

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Dielectric Constant of the plastic Bag = 3.7 = K

Thickness = 2.6 x 10^{5} m =d

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A = width x Length

width = 20 cm = 20 x 10^{-2} m

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we know that,

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So,

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And we also know that,

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A = 0.20 x L

d = 2.6 x 10^{5} m

Plugging in the values into the formula, we get:

0.28 = \frac{3.7 * 8.85 .10^{-12} * (0.20 . L) }{2.6 . 10^{5} }

Solving for L, we get:

L = 1.11 x 10^{6} m,

is the length of piece of 20 cm wide Aluminum foil to make capacitor large enough to hold 52000 J of energy.  

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