Why the mass has to be divided by 32.2. Can u explain in the source of this number? "he 12-lb block A and the 30-lb block B connectedby the weightless, frictionless pulley system are releasedfrom rest. Determine their speeds when block A hasdisplaced downwards by 4 ft.V41 = VB1 =0 V42 =-4v3,2 As12 =-4AS2.. As, = 1ft=W,AS 4,2+W,AS g214,2VA21 30Vg +12-(-4)+30 -1=012AS4.2= -4 ft2AVBB,22 32.22 32.2BVB.2VB.2 = 2.29 ft/sV4.2 = -9.14 ft/sAS B.2

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Why the mass has to be divided by 32.2. Can u explain in the source of this number?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.5P: The contact surface between the 36-lb block and 20-lb homogenous cylinder is frictionless. Can the...

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Question

Why the mass has to be divided by 32.2. Can u explain in the source of this number?

"he 12-lb block A and the 30-lb block B connected
by the weightless, frictionless pulley system are released
from rest. Determine their speeds when block A has
displaced downwards by 4 ft.
V41 = VB1 =0 V42 =-4v3,2 As12 =-4AS2
.. As, = 1ft
=W,AS 4,2
+W,AS g2
1
4,2
VA2
1 30
Vg +12-(-4)+30 -1=0
12
AS4.2= -4 ft
2
AVB
B,2
2 32.2
2 32.2
B
VB.2
VB.2 = 2.29 ft/s
V4.2 = -9.14 ft/s
AS B.2

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