9. You apply 100.0 N of force to a machine. The machine applies 20.0 N of force to the load. What is the mechanical advantage of the machine?
200.0
80.0
5.00
0.200
10. A construction worker is using his weight to keep a stationary stack of wooden beams from falling. If the construction worker uses 689.0 N of force to hold 10 beams stationary against a wall, how much work does he do?
0 J
0.0150 J
68.9 J
6,890 J
(will give medal

Question

9.   You apply 100.0 N of force to a machine. The machine applies 20.0 N of force to the load. What is the mechanical advantage of the machine?  
200.0
80.0
5.00
0.200
10.   A construction worker is using his weight to keep a stationary stack of wooden beams from falling. If the construction worker uses 689.0 N of force to hold 10 beams stationary against a wall, how much work does he do?  
0 J
0.0150 J
68.9 J
6,890 J
(will give medal

anonymous · Answer

@Nerdy_3000

anonymous · Answer

Mechanical advantage is:$$MA=\frac{ F _{out} }{ F _{\in} }$$where MA is mechanical advantage; Fout is force that comes out; and Fin is the force put in.

Work is defined as:$$W=Fd$$where W is work; F is force; and d is the distance over which the work is done.  If d=0, how much work is done?