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.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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the force on the thing and the distance the force moves the thing