A15.0-lb block rests on the floor. (a) what force does
the floor exert on the block? (b) a rope is tied to the
block and is run vertically over a pulley. the other end
is attached to a free-hanging 10.0-lb object. what now
is the force exerted by the floor on the 15.0-lb block?
(c) if the 10.0-lb object in part (b) is replaced with a
20.0-lb object, what is the force exerted by the floor on
the 15.0-lb block?

Now that we have a feel for the state of the circuit in its steady state, let us obtain the expression for the current in the circuit as a function of time. note that we can use the loop rule (going around counterclockwise): e−vr−vl=0. note as well that vr=ir and vl=ldidt. using these equations, we can get, after some rearranging of the variables and making the subsitution x=er−i, dxx=−rldt. integrating both sides of this equation yields x=x0e−rt/l. use this last expression to obtain an expression for i(t). remember that x=er−i and that i0=i(0)=0. express your answer in terms of e, r, and l. you may or may not need all these variables. use the notation exp(x) for ex.