Abuilding superintendent twirls a set of keys in a circle at the end of a cord. if the keys have a centripetal acceleration of 114 m/s2 and the cord has a length of 0.29 m, what is the tangential speed of the keys? answer in units of m/s.

5.75m/s

Explanation:

The formula we need to use here is the formula of centripetal acceleration given as

we have the acceleration and the radius (luckly in the units we need them to be)

replacing it would yield

then solving for v

(notice how m/ * m yields which when applying the square root yield m/s)

28. evolution

29. environment, survive, offspring  

explanation:

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.