If the magnification of an image is -0.4, what can be said about the image?
A. Nothing. There is not enough information.
B. The image is inverted and larger than the object.
C. The image is inverted and smaller than the object
D. The image is upright and smaller than the object.
Ans: C. The image is inverted and smaller than the object
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Why are main-sequence lifetimes shorter for more massive stars?
A) They aren't; higher mass stars have longer lifetimes. B) Strong stellar winds cause higher mass stars to lose mass quickly. C) Higher core temperatures allow fusion to proceed much more rapidly. D) More massive stars are made of heavier elements that don't fuse as easily.
A spatially uniform magnetic field cannot exert a magnetic force on a particle in which of the following circumstances? There may be more than one correct statement
1.The particle is charged. 2.The particle moves perpendicular to the magnetic field. 3.The particle moves parallel to the magnetic field. 4.The magnitude of the magnetic field changes with time. 5.The particle is at rest.
The Jovian moons Io, Europa, Callisto and Triton are
A) larger than Pluto but smaller than Mercury B) smaller than Pluto C) about the same size as Pluto D) larger than Pluto but smaller than the Moon
A pulse is described by 
in SI units. What is the velocity of the pulse?
A. 3 m/s in the +x direction B. 2 m/s in the ?x direction C. 2 m/s in the +x direction D. 4 m/s in the ?x direction E. 4 m/s in the +x direction