Both hydrogen gas and helium gas are lighter than air. why is helium used to lift blimps instead of hydrogen? a. helium has more lifting force than hydrogen because it has more electrons. b. hydrogen has less lifting force than helium because it has less mass. c. hydrogen has a tendency to lose an electron, decreasing lift. d. helium is more chemically stable than hydrogen and will not burn.

A because helium is in balloons and it’s lifting the balloon. Hope this helps!

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