What kind of quantity is a force? vector quantity

scalar quantity

molecular quantity

Newton quantity

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

1/0.14nm = 10^10/1.4 a lot

b.a device that inputs heat into a cool object