Question

The pressure inside a tire is measured as 28.0 . What is its pressure in ? 1 pound = 4.45 newtons 1 inch2 = 6.45 centimeters2 Express the answer to the correct number of significant figures. The pressure is .

Answer 1

Given: The pressure inside a tire (P) = 28.0 psi = 28.0 pound / inch²

And 1 pound = 4.45 newtons 1 inch² = 6.45 cm²

Calculation: We shall convert the given pressure in terms of Nm⁻²

Since,  

1 pound / inch² =  [1 pound× ( 4.45 N / 1 pound)] / [1 inch²× ( 6.45 cm² /1 inch²)]

or,                   =  [1 pound× ( 4.45 N / 1 pound)] / [1 inch²× ( 6.45×10⁻⁴ m² /1 inch²)]

or,                   =  6.899 ×10³ Nm⁻²

The pressure inside a tire (P) = 28.0 psi

or,                                            = 28.0 pound / inch²

or,                                            = 28.0 × 6.899 ×10³ Nm⁻²

or,                                            = 193.172 ×10³ Nm⁻²

or,                                            = 1.93172 ×10⁵ Nm⁻²

Since the given measurements have three significant figures.

Hence, the required pressure in the correct significant figures ( three digits) will be 1.93 ×10⁵ N m⁻².

Answer 2

Answer:

19.3

Explanation:

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