By definition, A newton is a unit of force and force is the product of mass and acceleration so
F = ma
[N] = [kg][m.s-2]
therefore 1 N = 1 kgm.s-2
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On Earth force in newtons equals roughly mass in kilograms x 9,8 newtons per kilogram. Force in newtons = mass in kilograms times 9.8 or mass in kilograms = force in newtons / 9.8. 73 kilograms are 715 newtons.
It would be: 8.694*10^4 metres
It is 3*108 metres/second.
7 femtoseconds in scientific notation is 7 x 10^-15 seconds
In value, yes. The extra zero on the end indicates a higher degree of precision. For example, 5.4 could really be 5.39, 5.43, 5.44, 5.36, etc. rounded to 5.4. That is because 5.4 has precision only to the tenths place so its error can be +/- 4 hundredths. However, 5.40 could only be off by 4 thousandths of an inch (5.403, 5.404, etc.), which makes 5.40 much more accurate than 5.4.