Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm
How fast is the star moving (Note: The speed of light is approximately 300,000 km/s, or 3 × 105 km/s.)?
A) about 10,000 km/s B) about 1,000 km/s
C) about 1,000,000 km/s D) about 100 km/s
D
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A pinned-end copper strut (E 5 110 GPa) with length L 5 1.6 m is constructed of circular tubing with outside diameter d 5 38 mm. The strut must resist an axial load P 5 14 kN with a factor of safety of 2.0 with respect to the critical load. The required thickness t of the tube is approximately:
(A) 2.75 mm
(B) 3.15 mm
(C) 3.89 mm
(D) 4.33 mm
What happened at 10-33 seconds when quarks could bind together for the first time?
A: the universe became transparent B: the expansion of the universe began C: helium formed D: protons and neutrons formed E: atoms formed
Our calendar is based on the length of the tropical year rather than the sidereal year
Indicate whether the statement is true or false
It is correct to say that impulse is equal to
A) momentum. B) the change in momentum. C) the force multiplied by the distance the force acts. D) all of the above E) none of the above