Determine (a) the final velocity, v [ft/s], of the block (at t=14 [s]), and (b) the...
Determine (a) the final velocity, v [ft/s], of the block (at t=14 [s]), and (b) the magnitude of reaction force, N [lb], while force F is acting on the block.
![Determine (a) the final velocity, v [ft/s], of the](http://img.homeworklib.com/questions/2d01c8b0-41ab-11eb-80ab-0fdd7bd7f441.png?x-oss-process=image/resize,w_560)
Homework Answers
B)
The reaction force on the block is
N = mg - F sin 20
= 120 lb - ( 15 lb ) sin 20
= 114.86 lb
Horizontal force
F cos 20 = m a
acceleration of the block is
a = F cos 20 / m
= ( 15 lb ) cos 20 / (120 lb / 32.2 ft/s^2)
= 3.78 ft/s^2
final velocity of block is
v = at
= ( 3.78 ft/s^2) ( 14 s)
= 52.95 ft/s
Add Answer to:
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