A balanced lever has two weights on it, one with mass #4 kg# and one with mass #2 kg#. If the first weight is # 9 m# from the fulcrum, how far is the second weight from the fulcrum? Physics Work and Energy Simple Machines 1 Answer Bio Apr 1, 2016 Answer: #18 "m"# Explanation: To balance the lever, the torque about the fulcrum must be zero. In this question, we have #M_1 = 4 "kg"# #a = 9 "m"# #M_2 = 2 "kg"# We want to find #b#. Therefore, #(4 "kg") * (9 "m") = (2 "kg") * b# #b = frac{(4 "kg") * (9 "m")}{2 "kg"}# #= 18 "m"# Related questions What is a lever? What is a pulley? How do a wheel and axle work? Why are simple machines not 100% efficient? Why is a fork a wedge? Why is a knife a wedge? Why is a ladder an inclined plane? Why is a zipper a simple machine? Why were simple machines invented? Question #8e654 See all questions in Simple Machines Impact of this question 197 views around the world You can reuse this answer Creative Commons License