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The following are the reasons for using steel instead of other materials to make robots. 

1. Steel is commonly available and it is found in the form of an alloy of Iron.

2. It is stronger than other metals like aluminum.

3. Welding is easy to do 

4. It blunts tools easily.

Hence the above reasons make steel favorable building material for Robots.

 

During sunrise and sunset, the light has to travel a long distance in the atmosphere. So light of small wavelength scatters and the least scattered light reaches our eyes. Red is the least scattered light. So sky looks red.

Two particles A and B start moving due to their mutual interaction only. If at any time 't;, \vec{a}_{A} \; and\; \vec{a}_{B} are their respective accelerations, \vec{v}_{A} \; and\; \vec{v}_{B} are their respective velocities and upto that time {W}_{A} \; and\; {W}_{B} are the work done on A & B respectively by the mutual force , {m}_{A} \; and\; {m}_{B} are their masses respectively , then which of the following is always correct.

A.

\vec{V}_{A}+\vec{V}_{B}=0

B.

m_{A}\; \vec{V}+m_{B}\; \vec{V}_{B}=0

C.

W_{A}+ W_{B}=0

D.

\vec{a}_{A}+\vec{a}_{B}=0

this qs is from the topic newton 2nd and 3rd law sir/mam

endel selected ___ true-breeding pea plant varieties, as pairs.
 

 Your Option is correct !!

A.

1
 

B.

2
 

C.

7
 

D.14

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