Hurrryyy which hand is negatively charged? a. b. c. d.

it's on plato- science if anyone knows. i can't provide a picture

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?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.