2
4.23 quiz works simple machines and power
question 5 of 15
2 points
work, the machine
when the input work on a simple machine equals the
is said to be 100% efficient

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm