
Understanding Motion  Problems I.1.1
 A pendulum completes 300 vibrations in 70 s. Calculate its period and frequency.
 If the frequency of a recording timer was determined to be 50 Hz, calculate the following:
 the period of the timer.
 the number of vibrations in 15 s.
 the time required to complete 70 vibrations.
 A recording timer makes 82 dots in 4.0 s.
 What is it period? Frequency?
 What is the change in time between the tenth and the thirteenth dot?
 A recording timer made 347 dot intervals on the recording tape between the starting line and the finish line. It took 4.3 s for the tape to pass beneath the striker.
Calculate the
 frequency of the timer.
 period of the timer.
 change in time between the third and sixth dot.
 number of dot intervals for a change in time of 2.4 s.
 number of dots for a change in time of 2.4 s.

