In what sequence should these chapters be prepared for my exams:- units and dimensions,kinematics,laws of motion,work power and energy,motion of system of particles and rigid body dynamics,gravitation. Apoorv Katoch asked Answer: It is better to follow...
Tag Archive: work
Permanent link to this article: http://www.plustwophysics.com/sequence-of-learning-physics/
A man walks 10 km towards west and then 12 km (60 degree_ direction of North-East. find the resultant vectors, magnitude and direction. A man walks 10 km towards west and then 15 km towards south. Find the resultant vectors, magnitude and direction. Ju...
Permanent link to this article: http://www.plustwophysics.com/homework-from-vectors/
Permanent link to this article: http://www.plustwophysics.com/can-light-do-some-mechanical-work/
Yudhvir asks: “Hello Sir!!! I m in 11th!! I want to do less work & more benefit!! I don’t like to study at all!!…but i have decided to do only DC Pandey!! is it enough for IIT preparation???” Answer: No pain, no gain! Whatever be the book you follow, understanding the basic concepts is all [...]
Permanent link to this article: http://www.plustwophysics.com/preparing-for-iit-jee-physics/
It is said that when work is done energy is lost. But when a man runs in a circular path and reaches the starting point, then the work done is zero but energy is lost. (Divyam asked) Answer: The work done here is not zero, work is done and energy is spent to overcome friction. [...]
Permanent link to this article: http://www.plustwophysics.com/misconception-on-work-and-energy-conservation/
“When a body is moving with uniform speed on a rough surface under the application of a constant external force and an equal and opposite frictional force, the work done by both the forces should be equal. as a result, the net work done by both the forces should be zero. however, we find that [...]
Permanent link to this article: http://www.plustwophysics.com/is-law-of-conservation-of-energy-violated-here/
Deduce the dimensional formula for workdone,pressure and density. [posted by boineelo ] Answer: workdone We know that workdone = force x distance Therefore [work done] = [force] [distance] but force = ma [force]=[m][a] [a]=[velocity]/[t] [velocity]=[displacement]/[t] So, putting all these together [work done]=[m][distance][distance]/[time][time] [work done]=ML2T-2 Similarly, you can work out the dimensional formula for pressure and density as [pressure]=[force]/[area]=ML-1T-2 [...]
Permanent link to this article: http://www.plustwophysics.com/dimensional-analysis-%e2%80%93-a-solved-example/