Question Details

Conversion of 1 MW power on a new system having basic units of mass, length and time as 10kg, 1dm and 1 minute respectively is

Options

A

2.16 x 10¹² unit

B

1.26 x 10¹² unit

C

2.16 x 10¹⁰ unit

D

2 x 10¹⁴ unit

Correct Answer :

2.16 x 10¹² unit

Solution :

The correct option is 2.16 x 10¹² unit.

To convert the power from one system of units to another, we can use the method of dimensional analysis. The relation between the numerical value and the unit of a physical quantity is given by:
n1u1=n2u2
where n1 and n2 are the numerical values, and u1 and u2 are the units in the first and second systems, respectively.

First, let us write the dimensional formula of power. Power is defined as work done per unit time:
Power=WorkTime=Force×DistanceTime

The dimensional formula for power is:
[Power]=[ML2T-3]

Let the SI system be system 1 and the new system be system 2.
For System 1 (SI Units):
Numerical value, n1=1 MW=106 W
Mass, M1=1 kg
Length, L1=1 m
Time, T1=1 s

For System 2 (New Units):
Numerical value, n2=?
Mass, M2=10 kg
Length, L2=1 dm=0.1 m=10-1 m
Time, T2=1 minute=60 s

Using the conversion formula:
n2=n1(M1M2)a(L1L2)b(T1T2)c

Comparing the exponents with the dimensional formula of power [ML2T-3], we have:
a=1, b=2, and c=-3.

Substituting the values into the conversion equation:
n2=106(1 kg10 kg)1(1 m0.1 m)2(1 s60 s)-3

Simplifying each term:
n2=106×(110)×(10)2×(60)3

n2=106×10-1×102×(216,000)

n2=107×2.16×105

n2=2.16×1012 unit

Therefore, the value of 1 MW power on the new system is 2.16 x 10¹² unit.

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