The mass of 6 million atoms of a diatomic gas is 
What is the atomic mass of this gas?
A. 25.5 u
B. 51.0 u
C. 2.55 u
D. 5.10 u
A. 25.5 u
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When a bimetallic bar of copper and iron strips is heated, the bar bends toward the iron strip because
A) iron gets hotter before copper. B) copper gets hotter before iron. C) copper expands more than iron. D) iron expands more than copper. E) none of the above
Nuclear Fission and Fusion: If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg)
A. 0.35 kg B. 1.75 kg C. 390 kg D. 1.1 × 108 kg E. 3.3 × 108 kg
An electron a distance d from a proton feels an electrostatic force of magnitude 
. Imagine that we move the electron so that it is a distance 2d from a helium nucleus (which has two protons and two neutrons). The magnitude of the force on the electron now is b , where b is
A. 4 B. 2 C. 1 D. 1/2 E. 1/4
A binary star system is one with two stars orbiting each other. How can the Doppler effect be used to find binary stars whose orbital plane is along our line of sight and determine their periods?
What will be an ideal response?