Physics 112        

Quiz 2



Feb. 14, 2005              UIN____________________________________


Please circle the letter of the best answer.


      1.   (3 points) In the space below, sketch the Moon orbiting the Earth in a clockwise direction.  Label the direction of the Moon's velocity and the direction of the Moon's acceleration.  Label the force on the Earth due to the Moon. 














      2.   The most common elements in the solar system are

            A)  equal amounts of hydrogen and helium, with small amounts of heavier elements.

            B)   about equal amounts of all elements up to iron, but very little of any heavier elements.

            C)   heavy elements, with smaller quantities of hydrogen and helium.

            D)  mostly hydrogen, smaller quantities of helium and very small quantities of heavier elements.


      3.   When light passes through a prism of glass

            A)  the different colors or wavelengths of light are separated in angle by the prism.

            B)   the different colors are caused by multiple reflections in the prism and interference between the resulting beams.

            C)   the prism adds colors to different parts of the broadly scattered beam coming out of it.

            D)  the prism absorbs colors from different parts of the broad beam coming out of the prism, leaving the complementary colors which we see.


      4.   What is the one fundamental difference between visible light and radio waves?


            A)  Their wavelengths are very different.

            B)   They always come from different sources.

            C)   Their speeds in outer space are different.

            D)  Radio waves are always wavelike, while visible light always behaves like particles.


      5.   The Earth has an average density of 5500 kg/m3 while the density of rock on its surface is about 3000 kg/m3. What conclusion can be reached about the Earth's core from this observation?

            A)  It is made of material far denser than surface rock.

            B)   It consists of lower density material than surface rock.

            C)   It must be very hot.

            D)  It must be composed of material with density about twice that of the surface material.


      6.   What did Galileo see when he observed Venus through his telescope?

            A)  Venus has phases like the Moon, and also like the Moon is almost constant in angular size.

            B)   Venus has phases like the Moon, and has its largest angular diameter near its new phase.

            C)   Venus has phases like the Moon, and has its largest angular diameter at crescent phase.

            D)  Venus has an angular size, which increases and decreases markedly, but does NOT show phases (e.g., crescent).


      7.   The low average densities of the large, outer planets, which have high masses and hence high gravitational fields, is an indication of what fact about their interiors?

            A)  They have hot, gaseous interiors, similar to cool stars.

            B)   They are composed mainly of very light elements, such as H and He.

            C)   Their interiors have not been condensed to liquid or solid form.

            D)  Their interiors are composed of H2O, CH4 (methane), and NH3 (ammonia).


      8.   The direction of light can be changed as it crosses from a less dense material to a denser one because

            A)  the light is attracted more strongly to the denser material.

            B)   light bonces off of a smooth surface.

            C)   the speed of light in the denser materal is faster.

            D)  the speed of light in the denser materal is slower.


      9.   Are there now, and were there ever, tides on the Moon?

            A)  There are no tides now, but there there were tides when the Moon was originally formed and it was molten.

            B)   There has always been one tide per day on the Moon.

            C)   There have never been tides on the Moon because no large bodies of water ever existed.

            D)  There have been two tides every day on the Moon since its beginning.



Answer Key -- S05 Quiz 2


      1.   (No answer.)   

      2.   D        

      3.   A        

      4.   A        

      5.   A        

      6.   C         

      7.   B         

      8.   D        

      9.   A