Question

A table has its minute hand 4.0 cm long. The average velocity of the tip of the minute
hand between 6.00 a.m. to 6.30 a.m. and 6.00 a.m. to 6.30 p.m. will respectively be-
(in cm/s)
​

Answer 1

Answer:

Explanation

Since displacement is required, only depends on initial and final points, here initial and final points of minute hands are same for both cases

1)

Displacement will be 2r, (r = 4cm) = 8cm

time = 3o min = 30 x 60 sec

Velocity = displacement / time = 8/(30 x 60) = 1/225 cm/sec

2)

Disp = 8 cm

time = 12 hr 30 min = 12x 3600   + 30x60 = 45000 sec

Veloctiy = 8/45000 =1/5625 cm/sec