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svet-max [94.6K]
3 years ago
10

When and why was the metric system invented?

Physics
1 answer:
inna [77]3 years ago
3 0

The first practical realisation of the metric system came in 1799, during the French Revolution, when the existing system of measures, which had become impractical for trade, was replaced by a decimal system based on the kilogram and the metre.

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A conservative force acts on a particle. We can conclude:
erma4kov [3.2K]

Answer:

option A would be the right choice

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A 66 kg person is parachuting and experiencing a downward acceleration of 2.1 m/s2. The mass of the parachute is 4.0 kg. (a) Wha
UkoKoshka [18]

Answer:

539N

Explanation:

Parameters given:

Mass of person = 66kg

Mass of parachute = 4kg

Downward acceleration = 2.1 m/s²

The total force acting on the system is the sum of the force of gravity and the force due to air acting opposite gravity:

F = mg - F(a)

Where g = acceleration due to gravity

Force is given as:

F = ma

=> ma = mg - F(a)

=> F(a) = mg - ma

F(a) = m(g - a)

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=> F(a) = 70(9.8 - 2.1)

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F(a) = 539N

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6 0
3 years ago
Energy Calculations
MaRussiya [10]

Answer: 20,734.69 N/m

Explanation:

The elastic potential energy (ELPE) of the rubber band is given by

E=\frac{1}{2}kx^2

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The box in the above picture is falling from the top of a building to the ground. Two major forces are acting on the box as it f
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