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GarryVolchara [31]
3 years ago
14

A student made the following observations about a squirrel’s movements:

Physics
1 answer:
dalvyx [7]3 years ago
4 0

The correct option is <u>D</u>.

Qualitative observations are observations that are made using our senses of sight, hearing, smell, taste and feel. These observations do not involve numbers or measurements of any kind.

The student's observations regarding the squirrel as is mentioned in options A, B and C involve measurements. Therefore these are not qualitative observations.

Option D, however, is made on the basis of sight, where the student observes the squirrel moving in a zigzag manner.

Therefore, of all the three observations, the student's observation that the squirrel ran in a zigzag pattern is the qualitative observation.

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From the question we are told that

    The  speed of the spaceship is  v  =  0.800c

    Here  c is the speed of light with value  c =  3.0*10^{8} \ m/s

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       l  =  l_o  \sqrt{1 -[\frac{v}{c } ]}

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So  

      l_o =\frac{l}{\sqrt{ 1 - \frac{v^2}{c^2 } } }

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  Applying above equation

            l  =l_o \sqrt{1 -  [\frac{v}{c } ]}

Here l_o  =145 \  LY(light \ years )

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           l=145 *  \sqrt{1 -  \frac{v_s^2}{c^2 } }

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