An aluminum light pole weighs 4300 N and supports an arm of weight 700 N, with the arm center of gravity at 1.2 m left of the centroidal axis of the pole. A wind force of 1500 N acts to the right at 7.5 m above the base. The pole cross section at the base has an outside diameter of 235 mm and thickness of 20 mm. The maximum compressive stress at the base is approximately:
(A) 16 MPa
(B) 18 MPa
(C) 21 MPa
(D) 24 MPa
(A) 16 MPa
Physics & Space Science
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An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field. At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg, e = 1.60 × 10-19 C)
A) 2.1 × 1010 Hz B) 4.8 × 10-7 Hz C) 2.1 × 1014 Hz D) 4.8 × 10-11 Hz
Physics & Space Science
Radio telescopes are _____
A) reflecting telescopes B) refracting telescopes C) infrared telescopes D) optical telescopes
Physics & Space Science
The speed of the electron in the Bohr theory of hydrogen is:
a. inversely proportional to n. c. proportional to n. b. inversely proportional to n2. d. proportional to n2.
Physics & Space Science
Most of the light we see coming from the sun originates in the ____________________
Fill in the blank(s) with correct word
Physics & Space Science