Problems: Measuring Time

watches 1Question 1

A worker on the production line in a factory is making footwear. An inspector times the worker whilst he makes 5 pairs of footwear.

To start, the stopwatch is set to zero.

After 5 pairs of footwear have been made, the stopwatch is as shown in Fig on right

(a) State the reading on the stopwatch.

(b) Calculate the time taken to make 1 pair of footwear.

(c) The worker has a target of making 300 pairs of footwear per hour.

Does the worker meet his target?


Question 2

A wheel is rotating at approximately 2 revolutions per second.

Describe how you would use a stopwatch to measure as accurately as possible the time for one revolution of the wheel. Make sure you include all the relevant information.


Wall ClocksQuestion 3

The clock on a public building has a bell that strikes each hour so that people who cannot see the clock can know what hour of the day it is.

At precisely 6 o’clock, the clock starts to strike. It strikes 6 times.

At the first strike of the bell, a man’s wrist-watch is as shown in Fig. 1.

When the bell strikes for the sixth time, the wrist-watch is as shown in Fig. 2.

(a) Calculate the time interval between the 1st strike and the 6th strike.

(b) Calculate the time interval between one strike and the next.

(c) At precisely 12 o’clock, the clock starts to strike.

Calculate the time interval between the 1st strike and the 12th strike.

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