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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
Homework Statement
Vector A + Vector B + Vector C = 0
A=B+C
Homework Equations
Find the angle between vector A and vector B
The Attempt at a Solution
I tried to solve this problem by resolving all the vectors and individually equating the value of vectors at each axes x, y and z to 0 but got...
Hi everyone, I am a 10th grader studying in India. I want to know what it will take to get into universities like Harvard, MIT, etc. I have been getting 10 CGPA from class 6th to 9th,and i hope to score well in my boards. I am also a 5th grade pianist(Trinity) and I hope to complete upto 7...