Which of the following is a scalar quantity ?? (also pls explain what is a scalar quantity if u can in easy words) i need help asap plz. plzz help 1) Distance

2) Displacement

3) Velocity

4) Force

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy