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scoray [572]
3 years ago
13

A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a __________ .

Physics
2 answers:
kodGreya [7K]3 years ago
7 0
The answer should be colloid.
____ [38]3 years ago
7 0

Answer:

A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a "colloids".

Explanation:

Consider the two types of heterogeneous mixture:

Suspensions: It is a mixture of liquid and particles of a solid and the particles may be visible by naked eyes.

If left alone, solid particles will settle down and separate over time.

Colloids: It is a heterogeneous mixture in which one substance's very tiny particles are spread uniformly across another substance. Particles will not settle down over a period of time. They're going to remain suspended or float.

Therefore, according to the above definition of suspensions and colloids, it is clear that the answer to this question is Colloids.

The complete statement is: A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a colloids.

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Which of the following is true when an object of mass m moving on a horizontal frictionless surface hits and sticks to an object
vivado [14]

Answer:

C. The initial momentum should be equal to the final momentum due to the conservation of momentum.

P_{initial} = mv_0\\P_{final} = (M+m)v_1\\v_1 = \frac{m}{M+m}v_0

Since m/(M+m) < 1, v_1 > v_0.

Explanation:

Wrong -> A. Since the smaller particle still moves after the collision, it has a kinetic energy.

Wrong -> B. The total initial momentum is equal to the momentum of the smaller particle. Therefore, the momentum of the objects that stuck together is equal to that of the smaller object.

Wrong -> D. Since the bigger object is initially at rest and the surface is frictionless, the direction of motion will be the same as the direction of the smaller particle.

4 0
3 years ago
A 5000kg car traveling at 40m/s crashes into a wall and comes to a complete stop in 10s. What was the force on the wall? solve s
IrinaK [193]

Answer:

20,000 N

Explanation:

First find the acceleration:

a = Δv / Δt

a = (0 − 40 m/s) / 10 s

a = -4 m/s²

Next use Newton's second law to find the force on the car:

F = ma

F = (5000 kg) (-4 m/s²)

F = -20,000 N

According to Newton's third law, the force on the wall is equal and opposite the force on the car.

F = 20,000 N

4 0
3 years ago
What do you understand by the term intensity of sound​
tensa zangetsu [6.8K]

Answer:

It means how loud or how soft an object vibrates.

Explanation:

6 0
3 years ago
What type of device is a car engine?
34kurt

Answer:

D. a heat engine that uses heat to do work

4 0
3 years ago
If the solar system shrank so that the sun were located just one centimeter from Earth, about how far away could you find the ne
DedPeter [7]
E                  S                                                               *

The "E" represents Earth, "S" represent Sun, and the "*" represents the nearest star(which is Proxima Centauri).

The main thing to worry about here is units, so ill label everything out.
D'e,s'(Distance between earth and sun) = .<span>00001581 light years
D'e,*'(Distance between earth and Proxima) = </span><span>4.243 light years

Now this is where it gets fun, we need to put all the light years into centimeters.(theres alot)
In one light year, there are </span>9.461 * 10^17 centimeters.(the * in this case means multiplication) or 946,100,000,000,000,000 centimeters.

To convert we multiply the light years we found by the big number.
D'e,s'(Distance between earth and sun) = 1.496 * 10^13 centimeters<span>
D'e,*'(Distance between earth and Proxima) = </span><span>4.014 * 10^18 centimeters
</span>
Now we scale things down, we treat 1.496 * 10^13 centimeters as a SINGLE centimeter, because that's the distance between the earth and the sun. So all we have to do is divide (4.014 * 10^18 ) by (<span>1.496 * 10^13 ).
Why? because that how proportions work.

As a result, you get a mere 268335.7 centimeters.

To put that into perspective, that's only about 1.7 miles

A lot of my numbers came from google, so they are estimations and are not perfect, but its hard to be on really large scales.</span>
8 0
3 years ago
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