Question

Please give the answer using two significant figures.

Problem 10.24 The hour hand on a certain clock is 10 cm long. Part A Find the tangential speed of the tip of this hand. Express your answer using two significant figures. Ad ? Vt = mm/s Submit Previous Answers Request Answer * Incorrect; Try Again; 2 attempts remaining

Answer 1

Given R=10cm (radius of clock)

Distance traveled = parameter of clock =2 π R =2x3.14x10 =62.8cm =628mm

For 12 hour clock, it takes 12hours to complete one revolution for hour hand

i.e. It travels 628mm in 12hrs = 43200 s

therefore, tangential speed = Distance/time = 628/43200=0.0145 mm/sec.

Hope this may help you. Thanks.