<span> Space exploration has developed better spacesuits.</span>
In the circuit outside of the battery the electrons have to expend all of their energy on the internal resistance of the battery which causes heating
Let's call

the mass of the glider and

the total mass of the seven washers hanging from the string.
The net force on the system is given by the weight of the hanging washers:

For Newton's second law, this net force is equal to the product between the total mass of the system (which is

) and the acceleration a:

So, if we equalize the two equations, we get

and from this we can find the acceleration:
closed and unsecure circuit