Why are movie scenes in outer space often unrealistic?
2 answers:
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The correct answer to the question is unitless i.e the IMA of a mechanical system has no unit.
EXPLANATION:
The IMA of a mechanical system stands for ideal mechanical advantage. It can be defined as the number of times the input or effort force provided to the mechanical system is multiplied under ideal conditions. The ideal conditions means that the system is free from friction, air resistance etc.
Let us consider is the distance over which the input force is applied.
Let is the distance over which the output force is applied.
The ideal mechanical advantage of the system is calculated as -
IMA = .
Both are measured in distance unit.
Hence, IMA is a unitless physical quantity.
Answer:
(e)-The current is doubled.
Explanation:
According to Ohm law, where I is the current, V is the voltage and R is the resistant.
If V is doubled, while R remains constant
we would have
The current is doubled.
Answer:
Air kerma
Explanation:
The acronym for the word 'kerma' is . It is the sum or the total of the kinetic energies of the
that is liberated by the uncharged ionizing radiation in the small sample of a matter, and is divided by the mass of that sample.
It is sometimes used for expressing the radiation concentration that is delivered to a point.
It is used to specify the intensity of the x-rays for any given point in the air at some known distance form the local spot. The total air kerma can be monitored in the fluoroscopic procedure.