Physics: Units and Measurements

Ans:


1. v = u + at
2. s = ut + 1/2 at^2
3. v^2 = u^2 + 2as

where,

v = final velocity

u = initial velocity

a = acceleration

t = time taken

s = distance travelled

Q1. State all the equations of Motion

ans:


1. 9.46 x 10^15 m
2. 1.49 x 10^11 m
3. 1 x 10^-10 m
4. 3.08 x 10^16 m

\
1pc = 3.26 ly

convert these units to meters.


1. 1 lightyear
2. 1 astronomical unit
3. 1 Armstrong
4. 1 parsec

and convert

, 1 parsec into lightyear

ans:


1. it is a rational system. (only one unit for one physical quantities.)
2. it is a coherent system. (no new number is introduces during conversion)
3. it is a metric system. (can be converted to its bigger/smaller units)

State three advantages of SI units.

ans:


1. FPS (foots, pounds, seconds)
2. CGS
3. MKS

Name the three basic systems of units other than SI

ans:

Any physical relation (formula) is DIMENSIONALLY CORRECT if the dimentions of thr VARIOUS TERMS on either sides of the relation are same.

eg: A=B+CD+(E-F/G) ie

\[A\]=\[B\]=\[CD\]=\[E-F/G\]

State the principal of homogeneity