# Tag Info

Accepted

### Does a rocket moving in a circle expel exhaust at a greater velocity?

The energy of the fuel does become the kinetic energy of the exhaust. Let us ignore the fact that the rocket becomes lighter as it burns fuel, and that it will eventually run out of fuel. The rocket ...
• 40.7k
Accepted

### Question regarding gravitational force as external force

My doubt is if gravitational force is considered as an external force Yes, it is considered as an external force, an external conservative force. ...so how come can we apply Total mechanical energy ...
• 21.8k
1 vote

### In the flow equation in Lecture 9 from Susskind’s ‘Classical Mechanics’, why is there a negative sign? Why is there partial and regular derivatives?

He says that if the flow velocity $v_x$ in the $x$ direction varies across the box, then the net flow into the box in the $x$ direction (across two faces) will be proportional to \$-\frac{\partial v_x}{...
• 21.8k
1 vote

### Equilibrium in physics

In short, it has to do with dissipation. I will start with a very qualitative answer. A classical pendulum (or oscillator) does not exchange energy/heat with the environment so it is "stuck" ...
• 4,799

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