Answer:
The centripetal acceleration of the edge of the top 
Explanation:
Given:
Speed with which the top rotates = 0.63 m/s
Radius of the top = 0.10 m
To Find:
Centripetal acceleration of the edge of the top =?
Solution:
The centripetal acceleration is the rate at which the tangential velocity changes. Also its direction is always inwards along the radius vector of the circular motion.
We know that centripetal acceleration is

Where
v = velocity
r = radius
Substituting the values



The second one because the zeroes in the middle count. 2.0002
Answer:
a) 4500 cycles b) 0.0667s c) 6.67s
Explanation:
a) 15 Hz= 15 cycles/ s
5 mins= 300s
15 cycles/s * 300s= 4500 cycles
b) Period= 1/ frequency
Period= 1/ 15 cycles/s
Period= 0.0667s
c) Period * number of revolutions= time
0.0667 * 100= 6.67s
Answer: That's air resistance.
Explanation: Well, air resistance is an upward force exerted on falling objects.
( I hope this helped <3 )