q1--While Measuring the length of a knitting needle,the reading of the scale at one end is 3.0 cm and the other end is 33.1 cm what is the length of the needle?
q2---Write the similarities and differences between the motion of a bicycle and the motion of a ceiling fan that has been switched on
q3---Why would you not like to use a measuring tape made of 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
Answers
Answer:
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? Answer: Length of the needle = 33.1 cm – 3.0 cm = 30.1 cm.
Similarities (i) The wheel of a bicycle and a ceiling fan execute a rotational motion on a fixed axis. (ii) The particles of both exhibit circular motion except the particles at the centre. Differences (i) Bicycle change its position while exhibiting circular motion but a ceiling fan does not change its position
Elastic tapes are stretchable. So, the length of an elastic measuring tape will change each time due to stretching. So, it will not give correct measurement of a distance. Therefore, we cannot use an elastic measuring tape to measure distance.
Explanation:
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