The force f1, 10.0n acts at 10.0cm. what is the magnitude of the torque due to f1 about an axis through point a perpendicular to the page? is it clockwise, or is it counterclockwise? ( point a is at 0 on a meter stick. there is also a point b at 50cm and f2 is 70cm with a force of 15.0n)

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.