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nlexa [21]
3 years ago
9

An object is accelerating if there is a change in speed and/or ________.

Physics
2 answers:
Alborosie3 years ago
8 0

Acceleration means any change in the speed or direction of motion.
zhuklara [117]3 years ago
7 0
C it means chage of <span>. direction</span>
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The principle of work states that the ratio of work output to work input is always
snow_lady [41]

Answer:

work output is always less than work input - the ratio is less than 1.

Explanation:

This principle comes from the fact that a machine or system cannot produce more work than is supplied to it, because this would violate the energy conservation law (work is a type of mechanical energy).

In theoretical machines called "ideal machines" the input work is the same as the output work, but these machines are only theoretical because in real applications there is always some type of energy loss, either in heat produced by a machine or processes for its operation, for this reason the output work is always less than the input work.

Regarding the ratio work output to work input:

\frac{WO}{WI} < 1

because work input WI is always greater than work output WO.

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3 years ago
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What is the difference between a physical change and a chemical change
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A physical change in something doesn't change what the it is. For example, if you break glass, it will still be glass. In a chemical change where there is a chemical reaction, a new thing is formed and energy is either given off or absorbed. For example, when you burn a log. The carbon in the log is reacting to the oxygen to create ashe and smoke
6 0
3 years ago
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loris [4]

Hi

The answer to this question is B. Reaction

7 0
2 years ago
The atomic mass of an element is
inessss [21]

Here are the answers to the question. Make sure to give a valid reason, please.

A. the sum of the protons and neutrons in one atom of the element.

B. a ratio based on the mass of a carbon-12 atom.

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D. twice the number of protons in one atom of the element.

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