Units and Dimensions

Question 1

Dimensional Formulas:
1. G constant
2. Impulse of a Force
3. Resistance
4. Torque
5. Stress
6. Strain
7. Enthalpy

Answer 1

1. M-1 L3 T-2
2. MLT-1
3. M L2 T-3 I-2
4. M L2 T-2
5. M L-1 T-2
6. Dimensionless
7. ML2 T-2

Question 2

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Examples of:
1. Dimensional Constants
2. Dimensional Variables
3. Dimensionless constants
4. Dimensionless variables

Answer 2

1. Gravitational constant, Avogadro’s Constant
2. Length, velocity, etc.
3. e, pi, golden ratio
4. RI, specific gravity

Question 3

Formula of n2

Answer 3

n2 = n1 [M1 / M2]^a (L1/L2)^b (T1/T2)^c

Question 4

Sig Fig Rules

Answer 4

1. If digit to be dropped is smaller than 5, then preceding digit is left unchanged
2. If digit to be dropped is greater than 5, then preceding digit is increased by 1
3. If digit to be dropped is 5, then preceding digit is increased by 1
4. If digit to be dropped is 5, then preceding digit is left unchanged if even
5. If digit to be dropped is 5, then preceding digit is increased by 1 if odd