Which of the following describes the net force acting on an object?

A. The sum of all forces acting on an object
B. The gravitational force minus any contact forces acting on an object
C. The difference between the normal force and the gravitational force acting
on an object
D. The sum of all the forces acting on an object in the same direction

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.