Galaxies at very large distances from the Milky Way often look distorted
Indicate whether the statement is true or false
TRUE
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Consider this image that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster C) a large galaxy with four central masses that glow brightly D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots.
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point does the magnitude of the vertical component of velocity have its minimum value? (air resistance is negligible)
a. just after leaving the center fielder's hand b. just before arriving at the catcher's mitt c. at the top of the trajectory d. magnitude of vertical component of velocity is constant
A nearsighted person cannot see objects beyond 80 cm from his eyes
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly? A) +80 cm, -1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, +1.3 diopters D) -1.3 cm, +1.3 diopters E) -80 cm, -1.3 diopters
Two charged bodies separated by a distance d exert an electrical force on each other. The charge on one of the bodies is doubled. The electrical forces on each body now
a. double b. decrease by 1/2 c. stay the same d. differ—the force on the other body doubles, but the force on the body whose charge was changed stays the same as before e. increase by a factor of four