The surface temperature of the Sun can be measured using ________.
A. Bode's rule
B. the Doppler shift
C. Wien's law
D. Kepler's third law
Answer: C
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A space station of diameter 80 m is turning about its axis at a constant rate. If the acceleration of the outer rim of the station is 2.5 m/s2, what is the period of revolution of the space station?
a. 22 s b. 19 s c. 25 s d. 28 s e. 40 s
A 120-V rms voltage at 1000 Hz is applied to an inductor, a 2.00-?F capacitor and a 100-? resistor. If the rms value of the current in this circuit is 0.680 A, what is the value of the inductor?
A) 34.2 mH B) 35.8 mH C) 11.4 mH D) 17.9 mH E) 22.8 mH
A steel plane truss is loaded at B and C by forces P 5 200 kN. The cross-sectional area of each member is A 5 3970 mm2. Truss dimen-sions are H 5 3 m and L 5 4 m. The maximum shear stress in bar AB is approximately:
(A) 27 MPa
(B) 33 MPa
(C) 50 MPa
(D) 69 MPa
The direction of the magnetic field of a bar magnet is
a. in the direction opposite to that in which a compass would point. b. in any direction. c. toward the south pole. d. toward the north pole.