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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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)

Physics & Space Science

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?

A. More and more scientists rejected their findings and reaffirmed the triumphs of classical physics. B. Their work moved science to the discovery of hydrogen as an element. C. It affirmed that quantum physics triumphed over classical physics in key cases. D. They showed that when using large length scales, quantum effects dominate. E. All of the above.

Physics & Space Science