 Chemistry
14 April, 05:36

# 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.

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1. 14 April, 06:17
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19.3

Explanation:

2. 14 April, 06:24
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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.