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Units and Measurement
Question
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State Kepler’s laws of planetary motion.

Answer

Kepler’s three laws of planetary motion are:

(i) All the planets revolve around the sun in elliptical orbits with sun at one focus.

(ii) The arial velocity of the planet is constant.

(iii)The square of the time period of revolution is directly proportional to the cube of semi-major axis of its elliptical orbit.

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Some More Questions From Units and Measurement Chapter

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?