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olga nikolaevna [1]
3 years ago
14

You do 1200J of work with gears.If the gears do 1000J of work, what is the efficiency of the gears?

Physics
1 answer:
slamgirl [31]3 years ago
8 0

Answer:

83.33%

Explanation:

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DNA’s diameter is 0.000000002 meters. What is this measurement in scientific notation? a. 2.0 x 109 m
NARA [144]

Answer:

0.000000002 m=2.0*10⁻⁹ m

Explanation:

Scientific notation allows us to write very large or very small numbers in abbreviated form. This notation simply consists of multiplying by a power of base 10 with a positive or negative exponent.

A number written in scientific notation has the form:

a*10ⁿ

where:

  • the coefficient a has a value such that 1 ≤ a <10
  • n is an integer.  Represents the number of times the decimal point is shifted. It is always a whole number, positive if it is shifted to the left, negative if it is shifted to the right.

So to write the number 0.000000002 in scientific notation, the following steps are performed:

  • The decimal point is moved to the right as many spaces until it reaches the right of the first digit.
  • This number is then written, which will be the coefficient a in the expression of the previous product. So a=2.0
  • The base 10 is written with the exponent equal to the number of spaces that the comma moves. So n=9. But this is a negative number because the comma shifts to the right.

So, you get: <u><em>0.000000002 m=2.0*10⁻⁹ m</em></u>

3 0
3 years ago
Why does a lunar eclipse last for a few hours whereas a solar eclipse only lasts for a few minutes?
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Answer:

The type and length of a lunar eclipse depend on the Moon's proximity to either node of its orbit. ... A total lunar eclipse can last up to nearly 2 hours, while a total solar eclipse lasts only up to a few minutes at any given place, due to the smaller size of the Moon's shadow.

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Which solute will dissolve first in the illustration?
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B explanation : they are both filled to the same pint
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Density = 1 g/cm^3 = 1000 Kg/m^3
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A boy is using a rope to pull a sled to the left on a horizontal surface. The rope is parallel to the surface. What are the dire
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Answer:

Explanation:

Check attachment

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