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3 years ago

What are the 3 base units of measurement ?

1 answer:

8 0

In the SI (International, metric) system of measurement, they are the Kilogram of mass, the Meter of length, and the Second of time.

With mass, length, and time, you can combine them in enough ways to measure ALMOST everything that can be measured in the physical world, like speed, velocity, acceleration, momentum, area, volume, force, energy, pressure, etc.

'Almost'. You still need a few more to wrap things up. The other quantities (and their SI units) are: Electric charge (the Coulomb), temperature (the Kelvin), amount of a substance (the Mol), and luminous intensity (the Candela). You can't build these with only mass, length, and time.

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They rarely conduct electricity well.

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4 years ago

In a particular television picture tube, the measured beam current is 23.3 µA . How many electrons strike the tube screen every

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Answer:

Explanation:

Given that

Beam current (i)=23.3µA

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Then, the charge quantity is given as,

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Then, q=23.3×10^-6×28

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Also, the number of electron N is given as

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3 years ago

Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, the hip’s speed at impact

Westkost [7]

Answer:

-5.8868501529 m/s² or -5.8868501529g

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Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

$v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{1.3^2-2^2}{2\times 0.02}\\\Rightarrow a=-5.8868501529\ m/s^2$

Dividing by g

$\dfrac{a}{g}=\dfrac{-57.75}{9.81}\\\Rightarrow a=-5.8868501529g$

The acceleration is -5.8868501529 m/s² or -5.8868501529g

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The time taken is 0.118909090909 s

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