Which of the following worlds could an astronaut visit without the need for a spacesuit (and survive)?
A) Mercury
B) Venus
C) The Moon
D) Mars
E) None of the above; an astronaut would need a spacesuit to survive a visit to any world in the solar system (aside from Earth).
E) None of the above; an astronaut would need a spacesuit to survive a visit to any world in the solar system (aside from Earth).
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A velocity selector for ions uses perpendicular electric and magnetic fields. If the electric field used were 800 V/m, what magnetic field would allow the selection of a velocity of 4000 m/s?
A. 0.0400 T B. 0.0800 T C. 0.160 T D. 0.200 T E. 0.500 T
Occam's Razor
A) divides the inner planets from the outer planets. B) tells scientists to use the simplest model, all other things being equal. C) is the term that describes how thin the rings of the Jovian planets are. D) describes how a planet's orbital period and distance from the Sun are related. E) is the tool that Copernicus used to shave.
A 50-kg ice skater moving at 6 m/s collides with a second stationary skater with mass 70 kg. The skaters cling together after the collision and move without friction. Compute their speed after the collision
Recently, superconducting wire was made using magnesium diboride (S. Jin, H. Mavoori, C. Bower, and R. B. Van Dover, "High critical currents in iron-clad superconducting MgB2 wires," Nature 411, 563 (2001))
This is assumed to hold the promise of cheap efficient energy transmission. Explain how this might be true.