A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually uses 1,549 n of force. The roofer decides that it would be easier to use a system of pulleys to raise the shingles. Using the pulleys, 446 n are required to lift the shingles. What is the mechanical advantage of the system of pulleys? Explain your answer

Explanation:

Mechanical advantage is given by the ratio of output force by input force.

= Output force =

= Input force =

So,

The mechanical advantage of the pulley's is .

i think the answer is g1

hope i

-lavira: )

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.