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)

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg