The force of friction is equal to the pushing force, and the acceleration is zero
Explanation:
In this problem, we are pushing a piano along the floor, in the horizontal direction.
There are 2 forces acting in the horizontal direction on the piano:
- The applied force,
, acting forward - The force of friction,
, acting backward
Therefore, the net force in the horizontal direction is
According to Newton's second law, the net force is equal to the product between the piano's mass (m) and its acceleration:
Combining the two equations,
However, we are also told that the piano moves at constant speed, therefore the acceleration is zero:
And so,
which means that the force of friction is equal to the applied force.
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Answer:
Explanation:
The question says that, "The closest star to the earth is 2 light years away. Calculate this distance in SI units".
Given that,
The distance between the closest star and the Earth is 2 light years.
The SI unit of distance is m. It means we need to convert light years to meters. We know that,
2 light-years means,
So, the required distance is equal to 
.
Answer:
the sympathetic division and the parasympathetic division.
Explanation:
These two divisions have antagonistic (opposing) effects on the internal organs they innervate (send nerves to = act on).
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Answer:
= 3.869 × 10^-6 J/m³
Explanation:
Intensity is given as W/m^2 which is equivalent to J/ (s*m^2)
Speed of light is 2.99792 × 10^8 m/s.
Therefore;
Electromagnetic energy per cubic meter = Intensity/speed of light
= 1160 J/ (s*m³)/ 2.99792 × 10^8 m/s.
<u>= 3.869 × 10^-6 J/m³</u>
Explanation:
Katherine Johnson, NASA Mathematician Featured in 'Hidden Figures,' Dies at 101
Feb 25, 2020 — Their story was told in the 2016 Hollywood film “Hidden Figures,” based on Margot Lee Shetterly's nonfiction book of the same title , ...
