Astronauts appear weightless while working in the International Space Station because A)they are in a state of free fall.
B)there isn't any gravity in outer space.
C)they have very little mass when in outer space.
Eliminate
D)they have gravitational attractions to the sun and moon

Wooden , walls ,doors ,support

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

"induction" is the process of charging an object without touching it.hope my answer has you : )