PHYSICS MIDDLE SCHOOL

Explain whether smoke filling up a room is diffusion or not

Answers

Answer 1
Answer: Yes, it is diffusion !

Diffusion is the process in which gas, through random movement of particles, tends to fill up the whole volume of the container in which it is placed. So a similar process would lead the smoke, which is in form of gas (or light particles), to fill in the whole room in which it is contained.

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a ball is thrown upwards. after 2.5s, it has risen 50m. at what velocity was it thrown upwards? assume g = 10m/s squared.

Answers

Answer:

32.5 m/s

Explanation:

Given:

Δy = 50 m

a = -10 m/s²

t = 2.5 s

Find: v₀

Δy = v₀ t + ½ at²

(50 m) = v₀ (2.5 s) + ½ (-10 m/s²) (2.5 s)²

v₀ = 32.5 m/s

List the objects found in the universe in order of size

Answers

This is apartial list of Solar System objects by size, arranged in descending order of mean volumetricradius, and subdivided into several size classes. These lists can also be sorted according to an object'smassand, for the largest objects,volume,densityandsurface gravity, insofar as these values are available. This list contains theSun, theplanets,dwarf planets, many of the largersmall Solar System bodies(which includestheasteroids), all namednatural satellites, and a number of smaller objects of historical or scientific interest, such ascometsandnear-Earth objects.The ordering may be different depending on whether one chooses radius ormass, because some objects are denser than others. For instance,Uranusis larger thanNeptunebut less massive, and althoughGanymedeandTitanare larger thanMercury, they have less than half Mercury's mass. This means some objectsin the lower tables, despite their smaller radii, may be more massive than objects inthe upper tables because they have a higher density.Manytrans-Neptunian objects(TNOs) have been discovered, and their approximate locations in this list are shown, even though there can be a large uncertainty in their measurement.Solar Systemobjects more massive than 1021kilograms(oneyottagram [Yg]) are known or expected to be approximately spherical. Astronomical bodies relax into rounded shapes (ellipsoids), achievinghydrostatic equilibrium, when the gravity of their mass is sufficient to overcome the structural strength of their material. Objects made of ice become round more easily than those made of rock, and many icy objects are spheroidal at far lower sizes. The cutoff boundary for roundness is somewhere between 100 km and 200 kmin radius.[1]The larger objects in the mass range between 1018kgto 1021 kg (1 to 1000zettagrams [Zg]), such asTethys,Ceres, andMimas, have relaxed to anoblate-spheroidequilibrium due to their gravity, whereas the less massiverubble piles(e.g.AmaltheaandJanus) are roughly rounded,but not spherical, dubbed "irregular".

Which of the following statements is true? A) An object that is accelerating is always changing direction.
B) An object at rest has an instantaneous acceleration of zero.
C) Instantaneous acceleration is always changing.
D) An object that is accelerating is always changing speed.

Answers

Final answer:

Among the statements, B) An object at rest has an instantaneous acceleration of zero, is correct. This is because when an object is at rest, it isn't moving, and hence, no change in velocity and no acceleration. Other statements do not hold true in all cases.

Explanation:

The statement that is true among the options provided is B) An object at rest has an instantaneous acceleration of zero. When an object is at rest, it means it's not moving, and therefore, it doesn't have any acceleration. Acceleration is the rate at which an object changes its velocity. Thus, if an object is not moving, there is no change in velocity and hence, no acceleration. As for the other statements, A, C, and D, they do not hold true for all cases. An object can be accelerating while moving in a straight line (changing speed but not direction). Also, instantaneous acceleration isn't always changing - it can remain constant. Lastly, an object that is accelerating isn't always changing speed, as it could be moving in a circle at a constant speed.

Learn more about Acceleration here:

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Final answer:

The only fully accurate statement is that an object at rest has an instantaneous acceleration of zero, as no change in velocity indicates no acceleration. Other statements have instances where they might not always be true in the field of physics.

Explanation:

According to the fundamentals of Physics, only option B is fully correct: An object at rest has an instantaneous acceleration of zero. This is because an object at rest will stay at rest, with no change in velocity that would constitute acceleration.

Option A) is not entirely correct. An object that is accelerating may change direction, but not always. For example, a car can accelerate while driving straight.

Option C) is also not absolute. Instantaneous acceleration could be changing, but it could also be a constant rate if an object is moving with a uniform acceleration.

Finally, option D) is like A, is not always true: an object that is accelerating doesn't necessarily have to be changing speed. It could also be changing direction while maintaining the same speed.

Learn more about the Physics of Acceleration here:

brainly.com/question/30762941

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When taking a shower are girls suppose to wipe front to back ?

Answers

Answer:

Explanation:

I don't think it matters while taking a shower, however, while using the restroom, it is especially encourgaed to wipe front to back. The reasoning behind this is to prevent UTI's that are transferred by fecal particles and bacteria from the anus into the vagina. Hope this helps:)
I think you should always wipe front to back to prevent any type of bacteria from getting near you know..

What happens if there is too much friction?

Answers

Answer: there would be no motion

Explanation:

There would be no motion,as the object get stuck

Answer:

Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out.

How does the vibration of a drumhead cause a sound wave to form?

Answers

yes it does because it makes sound which causes waves
hope this helps
Yes it in fact does

Q. Why?: it makes sound which causes wave form due to sound vvvvibrattionssszz
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