A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2
b. 1/4
c. ?2
d. 4
e. ?1/4
e
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Molecular Bonds: Ionic bonding is due to
A. the sharing of electrons between atoms. B. the transfer of electrons between atoms. C. unequal charge distributions around neutral molecules. D. atoms bonding to hydrogen molecules.
Why is Mars' surface red?
a) because little green men painted it that way b) because its surface is mostly made of lava ejected from its giant volcanos c) because there is more ammonia than methane on the surface of Mars, unlike on the Jovianplanets Uranus and Neptune d) because the soil is iron rich and the iron reacted with oxygen in the early atmosphereto make rust e) because the carbon dioxide rain strikes the surface and reacts
Light will pass through a pair of Polaroids when their axes are
A) 45 degrees to each other. B) parallel. C) either of these D) neither of these
A spear is thrown by you at a very high speed. As it passes, you measure its length at 1?2 its normal length. From this you conclude that the moving spear's mass must be
A. one-half its rest mass. B. twice its rest mass. C. four times its rest mass. D. None of these choices are correct.