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Ulleksa [173]
3 years ago
13

If the world population grows at a constant rate of 1.8% per annum, how many years will it take to double? A) 17.7 years

Physics
1 answer:
AleksandrR [38]3 years ago
4 0

Answer:

after 38.8 years it will double

correct option is D 38.8 years

Explanation:

given data

population grows rate = 1.8%

to find out

how many years will it take to double

solution

we consider here initial population is x

so after 1 year population will be = (100% + 1.8% ) x = 1.018 x

and after n year population will be = 1.018^{n} x

so it will double

2x = 1.018^{n} x

take log both side

log 2 = n log (1.018)

n = \frac{log2}{log1.018}

n = 38.853

so after 38.8 years it will double

correct option is D 38.8 years

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What is the average electric current in a wire, when a charge of 150 C passes in 30 s?
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An air-gap, parallel plate capacitor with area A and gap width d is connected to a battery that maintains the plates at potentia
sergejj [24]

Answer:

The new potential energy decreases by the factor of 2 to the old potential energy.

Explanation:

Capacitance of a parallel plate capacitor is given by the relation :

C = (ε₀A)/d

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Here V is the potential difference between the plates.

According to the problem, the distance between the plates get double but area remains same. So,

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Here d₁ is new distance between the plates.

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