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Nadya [2.5K]
3 years ago
6

HELP ASAP! PLEASEEEE ​

Physics
1 answer:
Lady_Fox [76]3 years ago
5 0

Explanation:

Sorry i had to post it here. This is for the chemistry question on The top

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Which of the following scenarios describes an object being acted on by a conservative force?
andrew11 [14]

Answer:

Option: A feather falls from one end of a tube to the other inside a vacuum.

Explanation:

To answer the question we need to first understand what is meant by Conservative Force.

In principle, Conservative forces are basically forces that are not affected by outside parameters (<em>such as friction, air resistance etc</em>). If the present force is strictly based on the initial and the final location of the object, with the inbetween path being irrelevant, the force will be conservative. A conservative force will be zero if we are looking at a closed path-system. We can also say that the system's energy loss will not be a function of the distance covered but is a function of displacement.

Looking at the available options, we can see that:

<u>Option A: A woman hikes up a mountain to a point 20 feet above ground.</u>

This is a Non Conservative force as this case does not depend just on displacement but also in  the path in between, i.e. hiking up the mountain there will be other forces that will affect the woman such as air resistance.

<u>Option B: A dishwasher was pulled up to a window by a rope, using a pulley system.</u>

This is a Non Conservative force as this case does not depend just on displacement but also in the inbetween path along with the forces present in a pulley system such as friction.

<u />

<u>Option C: A feather falls from one end of a tube to the other inside a vacuum.</u>

This is a Conservative force as here we are looking at a vacuum and its a closed system of no other forces present due to vacuum. However, we CAN'T say that ALL forces in a Vacuum Are Conservative because there are cases of dynamic steady state fields where the system is prone to other forces (i.e. open system).

<u />

<u>Option D: A puck glides across and slowly comes to a stop on an ice rink.</u>

This is a Non Conservative force as this case does not depend just on displacement but also the motion until it comes to a stop, which is possibly due to the friction between the ice rink and the puck.

<u />

7 0
3 years ago
Salt is now added to the water in the bucket, increasing the density of the liquid. what happens to the tension in the string ?
AlexFokin [52]

The question involves a ping-pong ball that is held submerged in a bucket by a string attached to the bottom of the bucket.

The answer is the tension of the string will increase. This is because making the water salty increases its density, and consequently, increases its buoyancy. This is why sea water is more buoyant than fresh water. Therefore the ping pong is pushed more upwards by the water when salt is added than initially. This gives the string more tension.


5 0
3 years ago
Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the
iren2701 [21]

Answer:

A radio telescope helped the astronomers discover the CMB.

Explanation:

  • Penzias and Wilson while experimenting with a radio telescope in 1964, accidentally discovered the radiation that exists universally also known as the CMB.
  • This was used to support the "Big Bang Theory" and not the "Steady State Theory"
  • CMB is the faint cosmic radiation that fills up the universe. It provides important data for understanding early universe.
  • This data tells us about the composition of the universe and its age which raises new questions about the universe.
3 0
3 years ago
What material structure explanation lies behind the fact that the propagation velocity of longitudinal waves is the lowest in ga
Lina20 [59]

Answer:

What material structure explanation lies behind the fact that the propagation velocity of longitudinal waves is the lowest in gases and the highest in solids?

8 0
2 years ago
How does the digestive system help the muscular system?
Sveta_85 [38]

Answer:

I would say the answer is A... but I'm not so sure ....

8 0
2 years ago
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