Hi there, brand new to the site. Came across it when googling for help on tangential velocity in a rotational problem. Anyhow I have an online homework due at midnight and would love to have any help possible with this question before then. Heres the problem.... The hour hand on a certain clock is 8.9 cm long. Find the tangential speed of the tip of this hand in µm/s. I tried v= w(angular velocity)r so v= 2pi*r/ (60)(60) and got 155.3µm/s This however is incorrect and any help to lead me the right way is greatly appreciated :D Im an A student in Physics but just dont grasp rotation as well as the other topics. This question is probably very simple but it is just not clicking for me, maybe I am missing the correct formula to use?