Describe 4 common workplace practices that are risk factors for injury

Physics

1 answer:

Aleonysh [2.5K]4 years ago

7 0

High task repitition, forceful exertions, repetitive or sustained awkward posture

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How long is the photons journey from the milky way to earth

fgiga [73]

Well i’d love to answer your question but its missing some information. firstly the earth is within the milky way galaxy so something cannot travel “from” but if you said “through” the answer would be 299,792,458 meters a second

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3 years ago

Given that o.2i+bj+o.4k is a unit vector,what is the value of b?

pishuonlain [190]

Answer:

b = 0.89

Explanation:

The given vector is, $A=0.2i+bj+0.4k$

A is a unit vector

We need to find the value of b.

For a unit vector, |A| = 1

So,

$0.2^2+b^2+0.4^2=1\\\\0.04+b^2+0.16=1\\\\0.2+b^2=1\\\\b^2=1-0.2\\\\b=0.89$

So, th value of b is 0.89.

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3 years ago

Rubidium forms the positive ion Rb+. Does this ion have more or fewer electrons than the neutral atom?

ohaa [14]

Answer:

The ion has fewer electrons

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As Rubidium forms a positive ion Rb⁺ the number of electrons becomes fewer for the atom.

A positive charge on an ion indicates that the number of protons for the atom is greater than the number of electrons.
This leaves a net positive charge on the atom.
For a negatively charged ion, the number of electrons is more than the number of protons because they have gained additional electrons.
In a neutral atom, the number of protons and electrons are the same.

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Explanation:

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4 years ago

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