A large spool in an electrician's workshop has 70 m of insulation-coated wire coiled around it. When the electrician connects a battery to the ends of the spooled wire, the resulting current is 2.7 A. Some weeks later, after cutting off various lengths of wire for use in repairs, the electrician finds that the spooled wire carries a 3.5-A current when the same battery is connected to it. What is the length of wire remaining on the spool

54.0m

Explanation:

#First we solve for

let's denote the initial and final length of the rope as respectively and given as:

is the initial resistance and Rf the final of the wire.

From the initial resistance of the spooled wire are:

#Substituting eqtn 3 in 2, we get

#the length of wire remaining on the spool is 54.0m

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min