A steel tube with diameters d2 5 86 mm and d1 5 52 mm is twisted by torques at the ends. The diameter of a solid steel shaft that resists the same torque at the same maximum shear stress is approximately:
(A) 56 mm
(B) 62 mm
(C) 75 mm
(D) 82 mm
(D) 82 mm
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The lookback time of the cosmological horizon is
A) the age of the universe. B) the Big Bang . C) 1 billion years. D) 10 billion years.
If the distance between two isolated parallel plates that are oppositely charged is doubled, the electric field between the plates is essentially unchanged. However, the:
a. potential difference between the plates will double. b. charge on each plate will double. c. force on a charged particle halfway between the plates will get twice as small. d. force on a charged particle halfway between the plates will get four times as small.
The electrons in a beam are moving at 18 m/s. (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
(a) What is its de Broglie wavelength these electrons? (b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30° with the normal to the grating?
What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T • m/A)
A) 7.3 × 10-5 J/m3 B) 3.6 × 10-4 J/m3 C) 3.7 × 10-5 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.