# Search results

1. ### A Question about Torque....

Okay...I have a question.In the case described in the picture, the medium between the two forces, which would normally cause stationary or uniform circular motion, is not straight..The moment arm of each force is equal, and the forces are also equal...Now my question is, would the sum of torques...
2. ### B A Question about Charging by Conduction

Okay...Is it possible to charge a metal, by conduction, using only a single terminal of a battery???...Like it we touch only the negative terminal with the metal, is it going to get a negative charge??...If not, then why???
3. ### A Question about potential difference in Wire

Okay...I got a question. Charges move in a wire due to an electric field across its ends. Now, positive test charge in an electric field would have higher electric potential nearer to the positive plate than anywhere else. Now in case of a circuit, like the one I have drawn, the electric...
4. ### B A Question about Energy conversion...

Okay...Suppose we we lift up something from the ground upto a certain height. By doing so, we have imparted it some potential energy. If we now let go, it will start converting its potential energy to kinetic energy.Now, suppose we apply this analogy to the case of a positive charge place nearer...
5. ### B A Question about Effect of Surface Area on Loudness

Okay... I have a question about "effect of surface area on loudness".I am going to upload a diagram along this post.It shows two scenarios. The "red thing" is a barrier, which allows absolutely no air contact between the speaker and the listener. So the only way the sound can travel outside is...
6. ### A Question relating to Loudness and Transmission of Sound

Okay...I have a question and I am going to describe it using a scenario...Suppose there are two persons in two different but adjacent rooms. The wall in-between these rooms is 3 inches thick. There is absolutely no way for air to cross between the rooms. Now, one of the persons speaks and the...
7. ### A Question about Sound Waves Propagating Through a Large Metal Cube

Okay, I have a very simple question that...Suppose we have a very wide cube(dense and hard)...We place two persons at each of its ends...One the persons strikes its surface at one end. Now this person A will hear the sound due to vibrations of that end's surface (which further vibrate the air...
8. ### A Question about Loudness of Sound...

OKay...Loudness of a sound is "the magnitude of sensation of human ear", or ''how much violently ear drum vibrates due to sound wave" (That is according to my understanding)....Now, increasing the area of vibrating body increases the loudness of sound...My question is that, if we increase area...
9. ### A Question about Diffraction...

Okay...I have a question that, I have often read the statement in various topics on diffraction that "Diffraction is maximum when slit is comparable to wavelength of wave". Can someone point out what is exactly meant by ''greater or maximum diffraction'' here?...Like if we are going to talk...
10. ### A Question about the Speed of Waves...

Okay...I read that speed of a wave for a particular medium is constant, i.e it is independent of its frequency and wavelength...Hence we can conclude for a particular medium, all waves travel with same speed...Is' nt it contradictory with our usual observed phoenomenon..Like, if we take air for...
11. ### B A Question about transverse waves...

Okay....I have a question that, is it possible for a transverse waves to only consists of crests and not troughs (or vice versa)??..Like is it possible for the particles of the medium to only displace upwards from mean position , and not downwards???Any help is appreciated...
12. ### Time period of a Pendulum...

Okay...The time period of a pendulum is independant of its mass and amplitude.For the "independance of mass",the reason is that, for same amplitude (distance from mean position), any change in mass would have no effect on the acceleration of the mass (gravitational acceleration is...
13. ### B A Question about Effect of Force on Rigid Bodies...

Okay...I have a simple question that, if we apply a force to a wall, then according to F=ma, the wall should have some acceleration at all the points we are applying the force...My question is that since the wall does not move move back, does this acceleration only result in a slight deformation...
14. ### B A Question about Forces...

Okay...If we consider two bodies which are perfectly rigid (meaning they cant deform under any conditions), lets say a ball and a wall...If we throw the ball at the wall, will the ball bounce back???Any answer in terms of action/reaction pair will be appreciated....
15. ### A question about the speed of Light in different media...

Okay...The speed of light is affected by density of the medium in which it propagates....It is more in rarer medium and lesser in denser medium...Hence we can conclude that a medium affects the speed of light...My question is that why this ''affect'' is not ''continuous'', like why the speed of...
16. ### B A question about Vibrations...

Okay...I just have a simple question...For a vibrating pendulum, a one complete cycle is considered when it displaces from a certain position A and then again returns to that certain position A...My question is that the damping is continuosly taking place on the pendulum, so there is no way that...
17. ### B A Question about Hooke's Law...

Okay...Hook's Law is stated as ''the force (F) needed to extend or compress a spring by some distance X is proportional to that distance. That is: F = kX (Wikipedia)'' And further on this topic there is a statement that ''Hooke's law for a spring is often stated under the convention that F is...
18. ### Relation between Decomposition and Reversible reactions...

Okay...I read that the decomposition of water is a reversible reaction (because the constituents can react to form water and water can decompose to form constituents)...This lead me to another thought that almost all compounds can be decomposed (although it is true that their conditions for...
19. ### A question about solutions...

Okay...In most of the solutions(I am talking about polar-in-polar solutions) , the solute becomes ions and these ions are surrounded by solvent molecules...A solution is a type of mixture, so its constituents retain their own properties...My question is that how, after the dissolution of solute...
20. ### B A question about conduction...

Okay...It is written so often, even in the kinetic molecular model, that molecules of a substance (or atoms) collide with each other...so what does the collision of an atom actually mean, like at an atomic level...Do atoms get close to each other so that their electrons repel each...

Okay... I have two questions regarding thermal radiation...The first one is that, it is a constant fact that heat travels from hot to cold body, and all things give out thermal radiation, So arent these two facts contradictory in the sense that "everything is heating every other thing regardless...
22. ### Question about rolling friction

Ok...Suppose I try to roll a ball to the right...Its surface at the point of contact with the floor would be deformed, which would cause some ''rolling friction'' to the left, which in turn would cause some clockwise torque(rolling motion) in the ball...(please point out if something is wrong in...
23. ### Half Reactions

I do not have a clear concept about half-reactions...Can someone please give the half reactions for following reaction, Zn^0 + 2H^1 Cl^-1 -----> Zn^+2 Cl2^-1 + H2^0 or Zn + HCl ----> ZnCl2 + H2

Okay...I have an example of work calculation in my book in which a girl has carried a bag upstairs( i.e. to some height)...The force the girl has applied is taken equal to the weight of bag( W )...According to my understanding, The girl will apply a force greater than W when she lifts it up from...
25. ### B Upthrust and Floating

OKay I just want to confirm...It is written everywhere that if , in a liquid, the upthrust acting on an object is equal to its weight, it will float...If we consider an object taken deep into a liquid, and somehow its weight becomes equal to the upthrust acting on it, then it would just stay at...
26. ### Effect of Temperature on Solubility

Solubility of some some solids decrease with increase in temperature...There is an exothermic reaction so a lot of heat is produced in the solution...My question is that why does solubility decrease???...Any increase in temperature (the heat we provide) should just excite the molecules more and...
27. ### Acceleration and Forces

This example is written in several books, that is if you strike a ball against a wall it applies an action force on the wall and the reaction force from the wall is the reason for the ball bouncing back..Now i have a question here that when you throw the ball, you accelerate it upto some...
28. ### Solubility of Non polar substances in water

Water can dissolve O2 and CO2, both of which are non-polar....According to my understanding, water can only dissolve molecules which have polarity in their structure( like salt or sugar)....Oxygen gas is non-polar due to same atoms...I am not sure about CO2 but I think it is non-polar due to...
29. ### B Applied force

Okay, I just want to confirm...When we take an object to some height, let's say a bag taken upstairs, Do we have to apply the upward force equal to the weight of object or more than the weight of the object...??? I know that its more than weight..But just want to confirm...
30. ### Properties of elements...

We say about an element that this element is solid, liquid and gaseous in nature...(like we say oxygen and nitrogen are gaseous)...My question is that how can we say that an ELEMENT is solid, liquid or gaseous...From what I understand, elements are kind of ''represented'' by their atoms...So how...