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2 years ago

Which of the following is a measure of velocity?

Chemistry

2 answers:

padilas [110]2 years ago

6 0

The correct answer is 30 seconds

leva [86]2 years ago

3 0

Answer : The correct option is 30 meters/second, South.

Explanation :

Velocity : It is defined as the rate of change of position with respect of the time.

Velocity is a physical vector quantity, magnitude and direction are necessary to define it.

The formula of velocity is,

$v=\frac{\Delta x}{\Delta t}$

v = velocity

$\Delta x$ = change in position

$\Delta t$ = change in time

The unit of position is meter and the unit of time is second.

The SI unit of velocity is meter/second with direction.

Therefore, the correct option is 30 meters/second, South.

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100 points!! Brainliest if correct!!

Misha Larkins [42]

D has the fastest reaction rate because dynamite explodes almost immediately.

A isn't correct because rusting nails take forever to completely rust.

B isn't correct because logs burning can take around 10 to 20 minutes.

C isn't correct because food digestions takes anywhere between 10 minutes to an hour.

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3 years ago

Read 2 more answers

Zinc reacts with iron (iii) chloride yielding zinc chloride plus iron

olasank [31]

Answer:

I don't see a specific question, so I'll make a few comments and hope that answers the reason for the post.

Explanation:

Zinc(Zn) does react with iron chloride, since zinc is a more reactive metal than the iron.

When Zn is introduced to an iron (III) chloride solution, the Zn disoplaces the Fe atom in a displacement reaction.

The chemical equation of the reaction:

Zn + Fe(III)Cl3 → ZnCl3 + Fe

Energy is often realeased in this type of reaction, since the resulting chemical products have a lower energy that the reactants.

There are several metals more reactive than iron. One of the more interesting examples of a highly exothermic reaction with iron chloride (rust) is the reaction of aluminum with iron chloride. `This is highly exothermic and is labelled a thermite reaction. It provides a spectacular flame that is not enough to weld railroad tracks together.

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2 years ago

An analog and a digital version of an audio signal were copied.

tigry1 [53]

Answer:

Explanation:just did the question and I guessed an answer cuz I didnt know it and I got it wrong so its a for a p e x

3 0

3 years ago

Read 2 more answers

If the products of a reaction are Co2 and 2H20, what is known about the<br>reactants?

Svetradugi [14.3K]

Answer:

Reactant : A combustion of hydrocarbon.

Explanation:

It is known that when hydrocarbons are involved in combustion, they produce carbon dioxide and water.

CxHy + (x+y/4)O2 ===> xCO2 + y/2H2O

4 0

2 years ago

The cost of painting the circular traffic sign shown below is $3.50 per square foot. How much, to the nearest dollar, will it co

KiRa [710]

The cost of painting the traffic sign of 7.065 square feet is approximately equal to 25 dollar.

<u>Explanation:</u>

The cost of painting the circular traffic sign is given as 3.50 dollar per square feet. The diameter of the traffic sign is 36 inch, then its radius will be $\frac{36}{2} = 18$ inches.

But as the cost is given in unit of feet, we have to convert the radius from inches to feet.

1 inches = 0.0833 feet

18 inches = 18 × 0.0833 feet

So, the radius of the traffic sign will be approximately equal to 1.5 feet.

The area of the traffic sign will be $\pi r^{2} = 3.14 \times 1.5 \times 1.5 = 7.065$ square feet.

So, if the cost of painting 1 square feet of traffic sign is 3.50 dollar, then

cost of painting 7.065 square feet of traffic sign = 3.50 × 7.065 = 24.7 dollar.

Thus, the cost of painting the traffic sign of 7.065 square feet is approximately equal to 25 dollar.

8 0

3 years ago