The second hand on a watch is 3.0 cm long and rotates smoothly. What is the speed of the tip of the hand?

v = 0.00314 m/s

Explanation:

First we need to find the angular velocity of the second hand of the clock:

ω = θ/t

where,

ω = angular velocity = ?

θ = angular displacement

t = time taken

For 1 complete revolution:

θ = 2π radians

t = 60 s

Therefore,

ω = 2π rad/60 s

ω = 0.104 rad/s

Now, for the speed of the tip of second hand of watch:

v = rω

where,

v = speed of the tip = ?

r = radius = 3 cm = 0.03 m

Therefore,

v = (0.03 m)(0.104 rad/s)

v = 0.00314 m/s

none, its a machine

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force