measurement chapter class 9
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Solution 2S. It consists of 500 sheets of paper, each paper being equally thick. The unit of pressure is expressed in terms of fundamental units kg, m and s. The unit of work is joule. Measurement is defined as the comparison between unknown quantities with known quantities of the same kind. The units which are derived from the fundamental units are called derived units. Amount of matter contained in the body is called mass. If the area of a room is 36\(m^{2}\) and its length is 6m, find its breadth. The overhead point of the sky when one stand straight is called Zenith. These units may vary from place to place. e.g kilogram , meter, second are the fundamental units. The duration between any two events is called time. The reference standard with which we carry out the measurement of any physical quantity of the same kind is called unit. Example: length, mass, time, force, etc. It is defined as the time taken cesium -133 atoms to make 9192631770 vibrations. = 3.5 x \(10^{12}\) x \(10^{-3}\) x \(10^{-3}\) x \(10^{-3}\) x \(10^{-3}\)\(km^{2}\) [1km= \(10^{3}\)m]= 3.5\(km^{2}\) Thus, 3.5 x \(10^{12}\)\(mm^{2}\) is equal to 3.5\(km^{2}\) . Mass of the page = 2/500 = 0.004 kg = 0.004 * 1000 = 4 gm, Volume of the football (sphere) = $\frac{4}{3}{\rm{\pi }}$r3 =1.413 * 10-5, Volume of the cylinder (V) = ${\rm{\pi }}{{\rm{r}}^2}$ * l, 1 solar day= 24 hours = 24 * 60 * 60 = 86400 sec. The units of the fundamental quantities are called fundamental unit. The reference standard with which we carry out measurement of physical quantity is called unit. Given, Diameter of the volleyball (d) = 80cmRadius of the volleyball (r) = \(\frac{80}{2}\) = 40cm = 0.4m Volume of the volleyball (V) = ?We know that, V = \(\frac{4}{3}\ \pi\ r^{3}\) = \(\frac{4}{3}\ \times\) \(\frac{22}{7}\) \(\times\) [ 0.4\(^3\) ] = \(\frac{5.632}{21}\) = 0.271 = 2,71 \(\times\) \(10^{-2}\) m\(^3\)Hence, the volume of the volleyball is 2,71 \(\times\) \(10^{-2}\) m\(^3\), A 22mm\(\times\) 155mm\(\times\) 10mm book weighs 1.25kg. Measurement is defined as the comparison between unknown quantities with known quantities. To approach the subject quantitatively, it is essential that we make measurements. The units of the fundamental quantities are called fundamental unit. 2 hours, 10 minutes and 40seconds= 2 x 60min+10min+40 s = 120 min + 10min+40 s = 130 x 60s + 40s= 7800 + 40 s = 7840 s = 7.84 x \(10^{3}\) s Hence, 2hr , 15 min and 30 sec equals 7.84 x \(10^{3}\) sec, Express the following in power of 10. Watch Queue Queue Community smaller than society. 3. Sign up and receive the latest tips via email. Diameter of a football is 80cm. Unit is the reference standard with which we carry out the measurement of a physical quantity. For example length of the body is a fundamental quantity as it cannot be expressed in terms of other quantity. Measurement of the medicine is a must in the treatment of diseases. Find (a) the volume of the book(b) area of each sheet. So, in order to maintain the uniformity in measurement of physical quantities, the following standard units are used: State the relation between horsepower (hp) and watt(w). Social Studies ; View All Subjects . It is a network of social relationships which cannot see or touched. The advantage of SI system is that it brings uniformity in the measurement. It is essential in performing the experiment for making our daily food. Grade 6 Grade 7 Grade 8 Grade 9 Grade 10 Grade 11 Grade 12 Extra References other. One advantage of MKS over CGS is MKS is used all over the world. The measurement of unknown quantity can be done by comparing it with a standard quantity of the same kind.
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