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J
Johnbarrow
John from Bartow
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PHYSICS
Units of Measurement
Joule
Energy's universal currency: how a single unit connects force, heat, and electricity
6 days ago
0
Why is the joule considered a fundamental unit in both mechanical and electrical energy measurements?
Because it only measures mechanical work done by moving objects.
Because it quantifies energy transferred by force over distance and energy dissipated as heat in electrical resistance.
Because it is only used to measure electrical energy, not mechanical energy.
S
Simon
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CHEMISTRY
Units of Measurement
Micromole
Micromoles unlock the secrets of tiny chemical worlds invisible to the naked eye
10 days ago
0
Why is the micromole a preferred unit for measuring substances in biological systems?
Because it is larger than a mole and easier to measure in bulk substances.
Because it counts individual atoms directly without using Avogadro's number.
Because it represents a manageable number of particles suitable for small-scale measurements.
S
SteveO1
Technology and cars
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PHYSICS
Units of Measurement
Horsepower
Horsepower measures engine power with several standards varying by region and application
23 Jan 2026
0
Why are there different definitions of horsepower such as imperial, metric, and electric horsepower?
Because horsepower measures different physical quantities like force and energy in each system.
Because horsepower was adapted to different measurement systems and applications, leading to variations in its exact value.
Because horsepower is an outdated unit and no longer used, so definitions vary randomly.
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