1. a sewing machine needle moves with a frequency of 2.5hz. approximately how long does it take it to move from the highest point to the lowest point in its travel?
a)0.10s
b)1.25s
c)0.40s
d)0.20s
e)0.80s

Time taken, t = 0.4 seconds

Explanation:

It is given that,

A sewing machine needle moves with a frequency of 2.5 Hz, f = 2.5 Hz

We need to find the time taken by it to move from the highest point to the lowest point in its travel. The time period is given by :

T = 0.4 seconds

So, the time taken to travel from the highest point to the lowest point in its travel. Hence, this is the required solution.