A5.1-m-diameter merry-go-round is initially turning with a 4.1 s period. it slows down and stops in 25 s . part a before slowing, what is the speed of a child on the rim? express your answer to two significant figures and include the appropriate units. vv = nothing nothing request answer part b how many revolutions does the merry-go-round make as it stops? express your answer using two significant figures. δθδ θ = nothing rev

a)

rad s⁻¹

b)

rev

Explanation:

= diameter of the merry-go-round = 5.1 m

= radius of the merry-go-round = =   = 2.55 m

= time period of the merry-go-round = 4.1 s

= initial angular velocity of merry-go-round

Initial angular velocity is given as

=

=  

= 1.53 rad s⁻¹

b)

= final angular velocity of merry-go-round = 0 rad s⁻¹

= time taken to stop = 25 s

= angular displacement = ?

= Number of revolutions made before stopping

Angular displacement is given as

rad

Number of revolutions are given as

rev

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b.a device that inputs heat into a cool object