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Grade: 12
        For each natural number k,let Ck denote the circle with radius k centimetres and centre at the origin .on the circle Ck  ,a particle moves k centimetres in the counter clockwise direction .after completing it`s motion on Ck  ,the particle moves on CK+1 in the radial direction .the motion of the particle continues in this manner .the particle starts at (1,0).if the particle crosses the positive direction of the x axis for the first time on the circle Cn , then the value of n is equal to(a) 6.    (b)5.   (c)7.   (d)3.
10 months ago

Answers : (2)

Ashutosh Mohan Sharma
askIITians Faculty
180 Points
							The path of the particle is shown by bold line segments and arcs. It is given that on the circle Ckof radiuskcentimetres the particle moveskcentimetres. Therefore, angular displacement onkth circle is given by

Thus, angular displacement on each circle is 1 radian.

If the particle crosses thex-axis for the first time on circle Cn, then

Total angular displacement =nradians.

Clearly,
509-2495_07D2EB61-226E-4BB4-BC88-E7E7C1033926.jpeg
10 months ago
Dipesh Rawat
11 Points
							
(C)7
Th path of the particle is shown by bold line segments and arcs . It is given that on the circle c_k of radius k cm the particle moves k cm. Therefore angular displacement on kth circle is given by ​the circle already drawn in the previous answer . Therefore:
Theta=k/k radians or 1 radian. 
 Thus,angular displacement on eaxh circle is 1 radian.
If the particle crosses the x-axis for the first time on circle c_n then;
Total angular displacement=n radians
As the particle crosses the positive direction of
the X axis for the first time on the nth circle c_n.
total angular displacement>2πradians 
Thus n>2π and so n= 7
(C)is the correct answer 
4 months ago
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