When Niels Bohr was knighted for his contributions to physics, he chose for his coat of arms
A) a model of the planetary atom.
B) a rendition of an energy-level diagram.
C) the yin-yang symbol of Eastern culture.
D) none of the above
Answer: C
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NASA uses the famous "Vomit Comet," a KC-135 cargo plane, to provide astronauts and scientiest a simulated zero-gravity environment. The plane flies in a parabolic arc, at the top of which a passenger feels "weightless." This is because
A. the acceleration of the passenger is nearly zero at the top of the arc B. the gravitational force exerted by Earth on the passenger is nearly zero at the top of the arc C. the force exerted by the floor of the plane on the passenger is nearly zero at the top of the arc D. a and b
A strong temperature gradient contributes to steep pressure gradients and this can create very strong
A) latitudes. B) winds. C) doldrums. D) frictional force.
Magnetic Field of a Long Wire: A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/A)
A. 4.7 µT B. 6.4 µT C. 20 µT D. 56 µT
The capacitance per unit length of a coaxial cable, made of two concentric cylinders, is 50 pF/m. What is the radius of the outer cylinder if the radius of the inner one is 1.0 mm?
A) 3.0 mm B) 2.0 mm C) 4.0 mm D) 0.50 mm E) 1.0 mm