Need some help please

Identify the arrows that show the correct direction of heat transfer. 66°f 112°f 98°f

What are atoms of the same element with varying number of neutrons

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?