Which detection techniques can find the planet's orbital distance (assuming we know the mass of the star)?
A) only the Doppler technique
B) only the transit technique
C) only the astrometric technique
D) all of these techniques
D
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A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
The full moon rises around sunrise, and sets around sunset
Indicate whether the statement is true or false
A metal sphere of radius 10 cm carries an excess charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm above the sphere's surface? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 4.0 × 105 N/C B) 8.0 × 107 N/C C) 4.0 × 107 N/C D) 8.0 × 105 N/C E) 4.0 × 109 N/C
Gravitational waves
A. carry material into black holes. B. do not carry energy. C. are traveling distortions of space and time. D. are how pulsars pulse.