Refracting Telescope: A refracting telescope has an eyepiece of focal length -80 mm and an objective of focal length 36 cm. What is the magnification of this instrument?
Fill in the blank(s) with the appropriate word(s).
4.5
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The body chiefly responsible for ocean tides is the
1) Moon, 2) Sun, chiefly because 3) the Moon is closer to Earth than the sun. 4) gravitational pull by the Moon is less than that of the sun. 5) the difference between the Moon's pull on the near and far sides of Earth is appreciable.
Rotational Kinetic Energy: Consider a solid uniform sphere of radius R and mass M rolling without slipping. Which form of its kinetic energy is larger, translational or rotational?
A. Translational kinetic energy is larger. B. Rotational kinetic energy is larger. C. Both are equal. D. You need to know the speed of the sphere to tell.
Why is it so difficult to remove the lid from a vacuum-sealed jar?
A) The air pressure outside the jar pushes downward on the lid more strongly than the air pressure inside pushes upward on the lid. B) The higher pressure inside the jar pulls inward on the lid, holding it firmly to the jar. C) The vacuum inside the jar pulls inward on the lid, holding it firmly to the jar. D) The vacuum inside the jar pushes outward on the lid, holding it firmly to the jar. E) The air pressure inside the jar pushes upward on the lid more strongly than the air pressure outside pushes downward on the lid.
____________________ is the molecule most responsible for the greenhouse effect on Venus and Earth
Fill in the blank(s) with correct word