Why did scientists agree to use one system of measurement

A 50 kg boy running with a velocity of 6 m/s passes by a 2000 kg truck at rest. Which one has greater momentum, the truck or the boy?

A 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. When the sphere is immersed in water, what is the tension in the cord

Many people choose to buy expensive low energy lamps instead of cheaper filament lamps. Give two reasons for this

Two oppositely charged parallel plates separated by an insulator creates a capacitor. When a conductor connects the two plates, the Capacitor will discharge.

If a car goes along a straight road heading east and speeds up from 45 ft/s to 60. ft/s in 5 sec, calculate the acceleration

Jack drops a stone from rest off of the top of a bridge that is 24.4 m above the ground. After the stone falls 6.6 m, Jill throws a second stone straight down. Both rocks hit the water at the exact same time.

How is Electric current able to flow?

In a series circuit, loads which have the same voltage dropped across them will have?.

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.