Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?
A)
+2.75 diopters
B)
-2.75 diopters
C)
-4.72 diopters
D)
+4.72 diopters
E)
+7.00 diopters
A
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Why isn't the Andromeda galaxy's center a strong source of energy?
A) It only appears not to be because most of the energy is released towards a direction away from our Milky Way. B) It really is; dark matter in the space between the Andromeda Galaxy and the Milky Way is blocking our measurement of the total energy. C) Only a relative trickle of gas falls into the black hole. D) It is a very old black hole that has already converted most of its internal mass to energy. E) Andromeda is a small elliptical galaxy that supplies very little free gas to the zone near the black hole.
Viscosity definition
What will be an ideal response?
No net force acts on a loop of wire in a magnetic field when
A) no current is in the loop. B) no magnetic field lines pass through the loop. C) both of these D) neither of these