Which three played a role in the finding of Neptune?
A) Herschel, Hubble, and Einstein
B) Adams, Leverrier, and Galle
C) Shapley, Hubble, and Whipple
D) Bode, Herschel, and Fraunhofer
E) Newton, Einstein, and Tombaugh
B
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One currently-used practical application of antimatter is in
A) positron emission tomography (PET) scans of the brain. B) a popular breakfast cereal made of antimatter. C) the discovery of small cracks in metallic machinery such as airplane wings. D) nuclear magnetic resonance (NMR) medical diagnosis. E) propulsion of space vehicles.
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?
A) positive B) negative C) The particle could be either positive or negative. D) None of the above choices is correct.
Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall
A) has too little gravity to influence you. B) moves in the opposite direction to you. C) and you move at the same horizontal speed, before, during, and after your jump. D) has negligible inertia compared with the Sun.
Determine the temperature distribution through a uranium slab shown. Assume energy generation of 4,500 Btu/min?ft^3 and the slab is surrounded by water at 190ºF with a convective heat transfer coefficient of 450 Btu/hr?ft^2 ?ºF. Use a value of 21.96 Btu/hr?ft?ºF for thermal conductivity of uranium.
What will be an ideal response?