Question

7. While measuring the length of a knitting needle, the reading of the scale at one
end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?
8. Write the similarities and differences between the motion of a bicycle and a
ceiling fan that has been switched on.
9. Why would you not like to use a measuring tape made of an elastic material like
rubber to measure distance? What would be some of the problems you would
meet in telling someone about a distance you measured with such a tape?
10. Give two examples of periodic motion.​

Answer 1

Answer:

The answer is in brief

Explanation:

periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave. In each case the interval of time for a repetition, or cycle, of the motion is called a period, while the number of periods per unit time is called the frequency. Thus, the period of the Earth’s orbit is one year, and its frequency is one orbit per year. A tuning fork might have a frequency of 1,000 cycles per second and a period of 1 millisecond (1 thousandth of a second).