Why were the Spanish interested in conquering Peru?

What is the solution to the problem expressed to the correct number of significant figures? 12.0/7.11=?

xxMikexx [17]

Answer:

1.69.

Explanation:

The solution = 12.0 / 7.11 = 1.687 = 1.69.

The rule of significant figures for division states that: the results are reported to the fewest significant figures.

12.0 contains 3 significant figures.

7.11 contains 3 significant figures.

So, the solution should contain 3 significant figures.

Now, the issue id of rounding; In a series of calculations, carry the extra digits through to the final result, then round.

If the digit to be removed is equal to or greater than 5, the preceding digit is increased by 1.

The digit that should be removed is 7 that is larger than 5 so increase the preceding digit by 1.

3 0

3 years ago

An object has a mass of 4 grams and a volume of 2 cm^3.what is the density of the object?

stellarik [79]

Answer:

2.0 grams per cubic centimeter

Explanation:

(You can refer to the DMV triangle to help you solve this!)

Density = Mass/Volume

Density = 4.0g/2.0cm3

Density = 2.0g/cm3

Hope this helps!!!

-Unicorns110504

*Please mark brainliest*

3 0

3 years ago

Read 2 more answers

Exploring the Second Law

san4es73 [151]

Answer:

(a) The coefficient of performance of an irreversible refrigeration cycle is always less than the coefficient of performance of a reversible refrigeration cycle when both exchange energy by heat transfer with the same two reservoirs.

Explanation:

According to the Kelvin–Planck statement of the second law of thermodynamics ,it is not possible to construct a device which operates in cycle and does not produce effect on the environment than the production of work.

We know that

Coefficient of performance is the ratio of desired effect to the work input in a cycle.

Given all option is correct but most appropriate option is a.

So the option a is correct

(a) The coefficient of performance of an irreversible refrigeration cycle is always less than the coefficient of performance of a reversible refrigeration cycle when both exchange energy by heat transfer with the same two reservoirs.

5 0

3 years ago

15. When traveling through a smoke-filled area, a person must be able

maxonik [38]

When traveling through a smoke-filled area, a person must be able to have distance of at least 4 feet in order to safely reach a fire exit. That is option C.

<h3>What is a smoke-filled area?</h3>

Smoke-filled area is an enclosed area that is filled with smoke gas that is usually made up of carbon monoxide.

The smoke-filled area is usually caused by

Fire out break

Burning of plastics or chemical products

Release of fuming gases.

When there is smoke-filled area die to fire out break, there are some guidelines to follow to safely reach the fire exit early enough.

The importance of these guidelines include the following:

enable rescuers to navigate a scene more quickly,

identify risks and hazards,

locate safety points,

determine the safest way in and out of a building, and

map out evacuation routes.

The affected individual should get down and crawl while taking short breath through the nose because cleaner air is nearest to the floor.

Learn more about distance here:

brainly.com/question/7243416

#SPJ1

5 0

1 year ago

Balance the following chemical equation

ratelena [41]

Answer:

Explanation:

4). Ca(NO₃)₂ + Na₂SO₄ → CaSO₄ + 2Na(NO₃)₂

This question is incorrect.

Since, the final product by reacting Na⁺⁺ and NO₃⁻⁻ is NaNO₃

Correct equation will be,

Ca(NO₃)₂ + Na₂SO₄ → CaSO₄ + 2NaNO₃

This equation is in the balanced form.

5). Ni(NO₃)₂ + KI → NiI + 2K(NO₃)₂

Correct equation will be,

Ni(NO₃)₂ + KI → NiI₂ + 2KNO₃

[Since final product by reacting Ni⁺⁺ and I⁻ is NiI₂]

Balanced form of this equation will be,

Ni(NO₃)₂ + 2KI → NiI₂ + 2KNO₃

6). Ni(NO₃)₂ + KOH → NiOH + K(NO₃)₂

Correct form of the equation will be

Ni(NO₃)₂ + KOH → Ni(OH)₂ + KNO₃

[Since reaction of Ni⁺⁺ and OH⁻ gives Ni(OH)₂ and the reaction of K⁺ and NO₃⁻ gives KNO₃]

Now balancing this equation,

Ni(NO₃)₂ + KOH → Ni(OH)₂ + 2KNO₃

↓

Ni(NO₃)₂ + 2KOH → Ni(OH)₂ + 2KNO₃

8 0

3 years ago