My text book (Fundamentals of Physics by Halliday et al.) mentions the following about the work done in internal energy transfers: An initially stationary ice-skater pushes away from a railing and then slides over the ice. Her kinetic energy increases because of an external force F on her from t...

I have read in my textbook that maximum work is done by gas in a reversible expansion, but I do not know the reason behind it. Also is work done by gas maximum in reversible compression also?

The following question is taken from 10th class science NCERT book chapter 14th. Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy? (a) geothermal energy (b) wind energy (c) nuclear energy (d) bio-mass. The...

Assume that we have an exactly uniform gravitational field like that occur for an infinitely large plate, yet with a finite mass. As we know, two similar clocks located in a specific alignment in the field with different distances away from the plate, and at rest WRT the plate, undergo similar gr...