The refractive power of a lens of focal length 40 cm is
A. 4.0 D.
B. 0.40 D.
C. 2.5 D.
D. -2.5 D.
E. 0.16 D.
C. 2.5 D.
Physics & Space Science
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A motor drives a shaft with diameter d 5 46 mm at f 5 5.25 Hz and delivers P 5 25 kW of power. The maximum shear stress in the shaft is approximately:
(A) 32 MPa
(B) 40 MPa
(C) 83 MPa
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