A steel pipe (d3 5 104 mm, d2 5 96 mm) has a plastic liner with inner diameter d1 5 82 mm. The modulus of elasticity of the steel is 75 times that of the modulus of the plastic. Allowable stresses in steel and plastic are 40 MPa and 550 kPa, respectively. The allowable bending moment for the composite pipe is approximately:
(A) 1100 N?m
(B) 1230 N?m
(C) 1370 N?m
(D) 1460 N?m
(B) 1230 N?m
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If Earth's rotation slowed down so that it completed exactly one rotation about its axis in 100 hours (instead of 24), what would be the typical time interval between sunrise and sunset?
A) 50 hours B) 100 hours C) 12 hours D) 25 hours E) 24 hours
The following four forces act on a 4.00 kg object: 1 = 300 N east 2 = 700 N north 3 = 500 N west 4 = 600 N south What is the acceleration of the object?
A) 224 N in a direction 63.4° north of west B) 300 N in a direction 63.4° north of west C) 300 N in a direction 26.6° north of west D) 224 N in a direction 26.6° north of west E) 2100 N in a direction 26.6° north of west
A metal surface has a work function of 1.50 eV. Calculate the maximum kinetic energy, in eV, of electrons ejected from this surface by electromagnetic radiation of wavelength 311 nm
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = - 1.60 × 10-19 C, 1 eV = 1.60 × 10-19 J)
By the early part of the 20th century, theoretical physics had changed dramatically because of so many new results. The work of Franck and Hertz showed that the atomic levels were quantized. Why did that work specifically make so much of an impact at that time?