Mixtures can be separated using a variety of methods such as evaporation what mixture could be separated using this method

Answers

Answer 1

Answer:

Answer:

salt water.

sugar water

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Bruce (the dog) is pulling on his lead with a force of 40N at an angle of 26º below the horizontal. Show that the horizontal component of this force is about 36N.Help???

Answers

Answer:

The horizontal component of this force is about 36 N.

Explanation:

Given that,

Bruce is is pulling on his lead with a force of 40 N

Angle below horizontal, $\theta=26^(\circ)$

We need to find the horizontal component of this force. The horizontal component of any vector is given by :

$F_x=F\ \cos\theta$

$F_x=40* \ \cos(26)$

$F_x=35.95\ N$

$F_x=36\ N$

So, the horizontal component of this force is about 36 N. Hence, this is the required solution.

you will use the equation for work which is w= F times distance so you will take 40N times 36N which equals 1440N

Is the formation of rust on an iron nail a chemical change or a physical change? Explain your answer.

Answers

The formation of rust or the iron oxide, is by the chemical reaction between iron and atmospheric oxygen. Hence, it is a chemical change involving the formation of new product.

What is a chemical change?

A chemical change is accompanied by the making or breaking or chemical bonds and the formation of new products. Whereas, a physical change does not involve the change in chemical bond. Phase transitions, change in size,shape etc. are physical changes.

The rust formed in the iron material is iron oxide or Fe₂O₃. This process of forming rust by the action of air or water is called corrosion. Iron reacts with atmospheric oxygen or oxygen from water forms the rust.

The formation of rust makes the material destroy and to prevent this process some anticorrosive materials have to be applied. Hence, formation of rust is a chemical change.

To find more on corrosion, refer here:

brainly.com/question/489228

#SPJ2

it is a chemical change because you cannot undo rusting and a new substance- the rust- is formed

Lifting a bale of cotton is no easy task. Farmer Jones wanted to store the cotton in the loft of his barn but he could not budge the bale. He consulted the high school's science teacher for help. She suggested a simple machine. Farmer Jones' options included an inclined plane, a fixed pulley, a block and tackle, and a lever. If he had to lift the bale of cotton to a height of fifteen feet, which would be the MOST practical solution?

A) lever
B) screw
C) inclined plane
D) block and tackle (pulley)

Answers

An inclined plane would not be practical because he would still have to push it and the amount of effort and energy would increase. A lever would not be practical because he would have to use his weight to make the bale rise 15 feet. He would also need to make sure that he has a 15 foot ladder in the first place. A screw would not be practical because he would have to drill a hole through the medium and use rotation.

A pulley would be the most practical way of moving the cotton bale. A pulley supports movement and will help the farmer move the bale.

$\sf\ Answer:\ D)\ BLOCK\ AND\ TACKLE\ (PULLEY)$

Answer:

Explanation:

Why is a single system measurements necessary throughout the scientific community

Answers

It is necessary because using different measures can lead to various issues that can even be deadly sometimes. An example can be if i tell you that something needs to be prepared to a 0 degrees, but i don't say that it should be 0 degrees celsius, you might get it to a zero degrees kelvin which is -273 celsius, a temperature where atoms stop moving completely. Or you might mix chemicals improperly and cause explosions.

Answer:

Because it's more convenient

in order to proof a validity of a certain research conclusion, it need to be examined by other experts in similar field. If, the research is conducted with different system of measurement, the scientist who wants to review the conclusion first need to make additional effort to convert all the numbers into the measurement that they are familiar with.

Explanation:

Which force best represents Fg?

Answers

The weight of a barbell acting on a weightlifter in 80 N represents Fg.

Explanation:

Force exerted due to earth's gravity is represented as Fg. The gravitational pull is experienced by the mass of object has some force attached to by it which is called as force due to gravity.

The force is dependent upon the mass of the object experiencing the force. Hence the weight of a barbell acting on a weightlifter 80 N is the best example for Fg.

Answer:

The weight of a barbell acting on a weightlifter in 80 N represents Fg.

Explanation:

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?A. The mass of the balloon increases because the size of the balloon has increased.

B. The mass of the balloon increases because the temperature of the balloon has increased.

C. The mass of the balloon stays the same because the gas inside the balloon still has same mass after it warms up.

D. The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size.


  Please explain why you chose your answer

Answers

A). No. Mass doesn't just appear out of thin air. The total amount of mass never changes, no matter what you do to it.

B). No. Same reason as (A).

C). Yes. The total amount of mass never changes, no matter what you do to it.

D). No. The amount of mass never changes, no matter what you do to it.

C is the correct answer

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Okay! Last question was a warm-up question. And now to get your brain thinking some more, how about another one?:First you eat me, then you get eaten. What am I?