# Search results

1. ### Problem in understaning potential energy

Yes, I think it would, suppose the block is at height h in the beginning. We lift it by a distance x with velocity u. Now, if we drop it, when it reaches height h, it will have velocity v>u as only force of gravity is acting on it, hence total energy at h is greater than what it was before, then...
2. ### Problem in understaning potential energy

It is defined as the energy a body has due to its position or configuration, and measured by the work that could be done by a body passing from its present position to some zero position.
3. ### Problem in understaning potential energy

It should gain some energy, as when we will release the block, the block will gain kinetic energy, indicating it must have had some form of energy at the height which is converted into kinetic energy.
4. ### Problem in understaning potential energy

Homework Statement If we lift a block with constant velocity, by applying a force mg upwards, is the work done zero? Homework Equations The Attempt at a Solution The work done must be zero as the resultant force is zero, what I don't understand is how does the block get potential energy if...
5. ### Direction of friction in circular motion

Thank you so much @CWatters and @haruspex, this makes so much more sense to me now! :dademyday:
6. ### Direction of friction in circular motion

Could you help me understand why it is the frictional force that provides centripetal acceleration. I am taught that frictional force acts opposite to the slipping tendency, then why does it act radially inwards if the slipping tendency is tangential.
7. ### Direction of friction in circular motion

Homework Statement I can't understand why friction acts radially inwards when a body is rotating on a rough turntable. If the friction is removed, the body would move tangentially, hence it has slipping tendency tangential, not radially outwards, then shouldn't friction act tangentially...
8. ### Circular motion

Ohh I didn't see that, thank you! But how do I justify the book's approach, I don't understand why their answer is correct. They have divided the magnitude of component of velocity perpendicular to position vector by the magnitude of position vector.
9. ### Circular motion

Its [v sin^2(theta)]/b
10. ### Circular motion

No the book had a diagram, and angle is clearly marked with horizontal, similar to the one I have drawn in the post above.
11. ### Circular motion

Thats what I am getting, but the answer is different in the book, I checked the solutions and what they had done is that they took component of velocity perpendicular to position vector and then differentiated, I have a feeling that its wrong because thats not what my teacher taught, what do you...
12. ### Circular motion

Homework Statement A particle is moving parallel to x-axis in the positive direction with velocity v such that at all the instants the y -axis component of its position vector is constant and is equal to 'b'. Find angular velocity about origin. Homework Equations The Attempt at a Solution I...
13. ### Hybridisation doubt

I don't get it, how would the orbitals be arranged in fluorine then?
14. ### Hybridisation doubt

No, I don't think it would. Is that somehow related to the answer?
15. ### Hybridisation doubt

There is an example given in my textbook showing the structure of BF3. In it, they have hybridised the orbitals of B to sp2, but not of F. It's written sp2-p overlapping. Why isn't flourine also hybridised, seeing it has 3 lone pairs and 1 bond pair, it could have sp3 hybridisation? Also, in...
16. ### Normal reaction doubt

Homework Statement My question is not a homework problem. I am having difficulty in understanding the concept oof contact forces. Homework Equations What I don't understand is that when two bodies A and B are in contact and left on a frictionless surface, they apply normal reactions on each...
17. ### Doubt in electromagnetic induction

Thank you, I think I got it!
18. ### Doubt in electromagnetic induction

Thank you for your answer and sorry for replying late. I didn't understand this statement of yours completely, can you please elaborate? Also would this current be significant enough to be detected by a galvanometer?
19. ### Doubt in electromagnetic induction

Homework Statement suppose a coil is placed in a changing magnetic field and the circuit is not closed will the current induce in the coil Homework Equations The Attempt at a Solution What I thought was that the current flows only in a closed circuit because it needs a potential difference...
20. ### How to make chemistry my forte

Hi everyone, I am a 10th grade student studying in India( would be in 11th in 2 months) I am not very good at chemistry. I have difficulty understanding the concepts. Although I don't have any doubts, I just don't feel confident. Also, my teacher is not very good. Whenever I would ask him...
21. ### SpaceX SpaceX Falcon Heavy Launch

On the circuit its written, "Made on Earth by 'humans'". It's so hilarious.
22. ### Minimum and maximum resultant of three vectors.

Thanks I got it! The minimum would occur when angle between them is 180 degrees meaning it is facing in the -x direction.
23. ### Minimum and maximum resultant of three vectors.

Homework Statement In order to solve a question, I need to find the minimum and maximum resultant of three vectors, their magnitudes are given to me. Homework Equations Magnitude of vector A = 1 Magnitude of vector B = 3 Magnitude of vector A = 5 The Attempt at a Solution The maximum part was...
24. ### Where does the gene for green color come from?

I was studying evolution and speciation and an example was given in my textbook. It said that there is a species of red beetles and through variation a green beetle is formed and then is naturally selected as red beetles are easily seen by crows and green are not. My question is where does the...
25. ### Reaction of acids with salts

yes, i meant solution only. Sorry for not mentioning. :)
26. ### How do i learn math and physics from the ground up?

Hey Nihal, I am from India too so I thought I might be able to help you. In which class are you right now?
27. ### Reaction of acids with salts

Okay got it. Thank you so much!
28. ### Reaction of acids with salts

Can we say that MOST acid and neutral salt reactions would have a similar situation?
29. ### Reaction of acids with salts

Thank you for clearing my doubt. Just one more thing. What is happening in the solution when an acid reacts with a basic salt?
30. ### Reaction of acids with salts

Hi I am new to the concept of neutralization. My teacher told me that acids do not react with neutral salts. I want to know why not. If both are dissolved in water and both completely dissociate, why can't the ions of acid and salt exchange and perform a double displacement reaction. Moreover I...