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प्रश्न
Answer the following in short.
What do you understand by the term ‘mass’? Name any one instrument used for weighing.
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उत्तर
The amount of matter present in an object is called it's mass. Instruments used to measure mass are beam balance, spring balance, physical balance, electronic weighing machines, etc.
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संबंधित प्रश्न
The unit of length convenient on the nuclear scale is a fermi : 1 f = 10– 15 m. Nuclear sizes obey roughly the following empirical relation : `r = r_0A^(1/3)` where r is the radius of the nucleus, A its mass number, and r0 is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise 2.27
Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):
Fill in the blank:
The ............ of an object is measured with the help of a beam balance.
Name and define the S.I. unit of time. How is it related to (i) minute (ii) hour, (iii) day, and (iv) year?
Fill in the blank.
The amount of matter contained in a body is known as its ...........
Name any one instrument used for measuring mass.
Which among the following is not a device to measure mass?
Mass is ______.
Write a short note on the following:
Common (beam) balance:
If Planck’s constant (h) and speed of light in vacuum (c) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?
- Mass of electron (me)
- Universal gravitational constant (G)
- Charge of electron (e)
- Mass of proton (mp)
