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laiz [17]
3 years ago
15

Cathy is moving into a tenth-floor apartment. She has a grand piano that weighs 570 pounds and is too big to fit in the elevator

or in the stairwell.
Which simple machines would make it easiest for Cathy to get her grand piano up to her new apartment?
A.
wheels and axles
B.
inclined planes
C.
screws
D.
pulleys
Physics
1 answer:
Kazeer [188]3 years ago
4 0

She will need pulleys. Nothing else will work

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The volume of the balloon increases in the upper atmosphere.

Explanation:

p1= 1 atm

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V1= 15.6 L

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sammy [17]

Here refrigerator removes 55 kcal heat from freezer

Refrigerator releases 73.5 kcal heat to surrounding

So here we can use energy conservation principle by II Law of thermodynamics

the law says that

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W = 18.5 kcal

So here compressor has to do 18.5 k cal work on it

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