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4 years ago

8

What are the signs of the angular velocity ω and angular acceleration α of the pulley in case (a)? by convention, clockwise rota

tions are negative and counterclockwise rotations are positive?

1 answer:

schepotkina [342]4 years ago

5 0

Everything which rotates in the direction of clock is taken as negative and opposite to clock is taken as positive. It is a sign convention.

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Which chemical equation represents a double replacement reaction?

liq [111]

D. NaOH + HCI NaCl + H,0

Explanation:

The last option is a double displacement/replacement reaction.

This reaction is a neutralization reaction in which an acid combines with a base to produce salt and water only.

NaOH + HCl → NaCl + H₂O

A double displacement reaction is one that occurs between ionic compounds.
In this reaction, there is an actual exchange of reaction partners.

One of the following conditions serves as a driving force;

Formation of water or any other non-ionizing compound
Liberation of gases
Formation of a precipitate

learn more:

Precipitate formation brainly.com/question/8896163

#learnwithBrainly

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3 years ago

Two balloons are charged with an identical quantity and type of charge: -6.25 nanoCoulombs (10-9). They are held apart at a sepa

xenn [34]

Answer:

force between both the balloons is $9.23\times 10^{-7}N$

Explanation:

It is given charge on both balloons are same and equal to $q=-6.25\times 10^{-9}C$

Separation between both the balloons $r=61.7cm=0.617m$

According to Coulomb's law force between two charges is given by

$F=\frac{1}{4\pi \epsilon _0}\frac{q^2}{r^2}=\frac{Kq^2}{r^2}$

Therefore force is equal to

$F=\frac{9\times 10^9\times (-6.25\times 10^{-9})^2}{0.617^2}$

$F=9.23\times 10^{-7}N$

So force between both the balloons is $9.23\times 10^{-7}N$

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3 years ago

How is silver, gold, and bronze different.

joja [24]

Answer:

Silver is a malleable and ductile metal having atomic number 47 and symbol Ag. Gold on the hand has atomic number 79 and symbol Au. It is also ductile and malleable. Both are soft and lustrous in nature. Both are transition metals.

Bronze is an alloy of majority of copper and some amount of tin. Formation of alloy enhances the properties of the metal and its industrial use. Bronze is harder than copper and easily fusible and easy to cast. It is resists corrosion.

Silver and gold have different atomic numbers, different colors. Both are transition elements where as Bronze is an alloy.

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Yes I am subscribed to coryxkenshin but are you subscribed to me jp

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3 years ago

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Sati [7]

Answer:

the index of refraction of the second medium is lower

Explanation:

take an exaple of a light ray from air to water that is optically denser the ray is refracted to the normal thus lowering its index of refraction

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3 years ago

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