The full moon has an angular diameter of approximately ____________________ arc minutes for an observer located on the surface of Earth
Fill in the blank(s) with correct word
30
thirty
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White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye
a. True b. False Indicate whether the statement is true or false
If an object is located 20 m to the right of the origin at 1:00 PM, and later the object is located 30 m to the left of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right. B. 50 m to the left. C. 30 m to the right. D. 30 m to the left. E. 10 m to the left.
A cantilever beam with rectangular cross section (b 5 95 mm, h 5 300 mm) supports load P 5 160 kN at its free end. The ratio of the magnitudes of the principal stresses (?1/?2) at point A (at distance c 5 0.8 m from the free end and distance d 5 200 mm up from the bottom) is approximately:
(A) 5
(B) 12
(C) 18
(D) 25
An incandescent lightbulb is rated at 100 watts when plugged into a 110 V rms household outlet. Calculate the resistance of the filament and the rms current.
A. 12.2 ?, 0.91 A (rms) B. 10 ?, 1.0 A (rms) C. 110 ?, 1.0 A (rms) D. 121 ?, 0.91 A (rms) E. 11 ?, 1.1 A (rms)