The torque required to loosen the bolt when perpendicular was:
t = 60N x 0.3 = 18 Nm
To have the same torque applied at 30 degrees:
18 Nm = Force x 0.3cos(30 degrees)
Simplify:
18 Nm = Force x 0.2598
Force = 18Nm / 0.2598
Force = 69.28 N
Round the answer as needed.
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B. It reflects light rays outward.
A convex mirror looks like this ⊂. So when light rays hit the outward curves, it bends the light rays outwards, and backwards, and it would appear to be coming from its center called the focus.
D - you divide 200/2 to get the average (change in y over change in x)
1) push down on the end of the lever, and 2) 3/4 of the way from the fulcrum