Question

एक दीवार-घड़ी के सेकेंड की सूई की लम्बाई 5 cm है तब
(a) सूई के सिरे (tip) की चाल ज्ञात करें।
(b) 0.0 से 15 s के बीच उसके वेग की दिशा में कितना परिवर्तन होगा?​

Answer 1

Step-by-step explanation:

As we know that the tip of niddle makes a circle and circumference will be the distance covered by it.

so here r = 5cm

also circumference of of circle is => 2pi r

=> 2×22/7×5

this is the distance covered by the niddle in one second i.e 31.4 cm/s

also 1m = 100 cm

so 31.4/100 = 0.314m/s

Answer 2

Step-by-step explanation:

1-- सूई के सिरे की चाल

=2π*सूई की लम्बाई / समय अंतराल

= 2*3.14*5/1 मिनट

= 31.4 सेमी/मिनट

= 31.4/60सेमी/सेकेण्ड

= 0.52cm/second

2-- 90° का परिवर्तन होगा।

Solution:-

(a) speed of tip

= circumference formed by locus of tip/ time period of arm's tip

= 2π×length of arm /1 minute

= 2×3.14×5

= 31.4 cm / minute

= 31.4 / 60 cm/second

= 0.52 cm/sec

(b) Change in direction of velocity= 90°

Hope this helpful for you