If the potential in a region is given by V(x,y,z) = xy - 3z-2, then the y component of the electric field in that region is
A) x + y - 6z-3.
B) -y.
C) -x.
D) x + y.
C
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Aluminum has a shear modulus of 
and a wave velocity for shear waves of 2,981 m/s. If the velocity of shear waves decreased by 10%, then what is the change in the shear modulus?
A. 35% B. 30% C. 25% D. 20% E. 15%
One way that future space stations may create artificial gravity is by rotating the station. Consider a cylindrical space station 380 m in diameter that is rotating about its longitudinal axis
Astronauts walk on the inside surface of the space station. How long will it take for each rotation of the cylinder if it is to provide "normal" gravity for the astronauts? A) 6.2 s B) 28 s C) 4.4 s D) 39 s
Newtonian gravity is often called universal mutual gravitation because every particle with mass in the Universe must attract every other particle
a. True b. False Indicate whether the statement is true or false
Why has direct imaging found so few exoplanets?
A) Direct imaging is only possible using military satellites. B) Direct imaging only works if the planet is orbiting a brown dwarf. C) Only a few attempts have been made to directly image an extrasolar planet. D) Exoplanets are faint and are usually close to their parent stars.