Question

solve the question (i) and (ii)


A 7cm long seconds hand completed one rotation in a wall clock. Then

i) Find the distance and displacement covered by it.

ii) Find the speed of second hand?​

Answer 1

Answer:

this is your answer friend

Answer 2

Explanation:

GIVEN - radius =7 cm

w.k.t.

DISTANCE=2πr (in circle)

hence,

distance= 2×22/7×7

• distance=44 cm

DISPLACEMENT=0

DISPLACEMENT is zero because, in one rotation second hand completes one rotation it means it's

closed path. therefore displacement of closed path is always zero .

now SPEED = distance/time

w.k.t. distance is 44cm = 0.4mtr

and

time is 60 sec. now speed is

SPEED = 0.4/60 = 0.0066m/s.