Jake drags a sled of mass 10 kg across the snow. the sled is attached to a
rope that he pulls with a force of 30 n at an angle of 25°. if there is no friction,
what is the normal force acting on the sled?

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.