What layers of the Earth's structure are not present in the Moon's structure?
What will be an ideal response?
hydrosphere, atmosphere, magnetosphere
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If a single lens forms a virtual image of an object, then
A) the lens must be a diverging lens. B) the lens must be a converging lens. C) the lens could be either a diverging or a converging lens. D) the image must be inverted. E) the object must be between the lens and its focal point.
Force F (see figure) is applied at C and is directed toward A. Its magnitude is F = 15 N. A unit vector along line CA is:
(A) -0.49i + 0.81j + 0.32k
(B) -0.5li + 0.73j + 0.39k
(C) 0.58i - 0.79j + 0.49k
(D) -0.65i + 0.22j + 0.43k
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.
Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7? By how much is the star brighter?
What will be an ideal response?