A journal bearing and rotating shaft as shown is lubricated with oil having viscosity of 800 cP. If the shaft is rotating at 2,000 rpm, determine the maximum oil temperature if both journal and shaft have a temperature of 60ºC.
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Circular Motion of Charges: An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A. 2.2 × 107 m/s B. 1.9 × 107 m/s C. 1.9 × 106 m/s D. 3.0 × 107 m/s E. 0.80 × 107 m/s
Which of the following is a possible unit of acceleration?
a. m/s2 b. m × s c. m2/s d. m/s
X-rays of wavelength of 0.0656 nm undergo Compton scattering from free electrons in carbon. What is the wavelength of photons scattered at 82.5° relative to the incident beam? (h = 6.63 × 10^?34 J?s, me = 9.11 × 10^?31 kg, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 0.0656 nm b. 0.0677 nm c. 0.0848 nm d. 0.0719 nm e. 0.0659 nm
The Sun is what spectral type?
a. S2 b. G2 c. F2 d. K2 e. ST2 (Spectral Type 2)