3.3-2 When drilling a hole in a table leg, a furniture maker uses a hand-operated drill (see figure) with a bit of diameter d= 4.0 mm. (a) If the resisting torque supplied by the table leg is equal to 0.3 N-m, what is the maximum shear stress in the drill bit? (b) If the shear modulus of clasticity of the steel is G= 75 GPa, what is the rate of twist of the drill bit (degrees per meter)?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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3.3-2 When drilling a hole in a table leg, a furniture maker
uses a hand-operated drill (see figure) with a bit of diameter
d= 4.0 mm.
(a) If the resisting torque supplied by the table leg is
equal to 0.3 N-m, what is the maximum shear stress in the
drill bit?
(b) If the shear modulus of clasticity of the steel is
G = 75 GPa, what is the rate of twist of the drill bit
(degrees per meter)?
Transcribed Image Text:3.3-2 When drilling a hole in a table leg, a furniture maker uses a hand-operated drill (see figure) with a bit of diameter d= 4.0 mm. (a) If the resisting torque supplied by the table leg is equal to 0.3 N-m, what is the maximum shear stress in the drill bit? (b) If the shear modulus of clasticity of the steel is G = 75 GPa, what is the rate of twist of the drill bit (degrees per meter)?
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