f. 2-3 approximation help.－bxzbthf的部落格

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f. 2-3 approximation help.

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chinese answer is ok!p. 2 1. Light travles at 299792.5 km/s. Thedistance between the Sun and the Earth is 149597890 km. Estimate the approximate time ( in seconds) required by light to travel from the Sun to the Earth.p. 33. Express the following numbers in scientific notation.a) 12345.6789b)... 顯示更多 chinese answer is ok! p. 2 1. Light travles at 299792.5 km/s. Thedistance between the Sun and the Earth is 149597890 km. Estimate the approximate time ( in seconds) required by light to travel from the Sun to the Earth. p. 3 3. Express the following numbers in scientific notation. a) 12345.6789 b) 1230000000 c) 0.00987 p. 5 1. Express the following fractions as decimals and correct your answers to 3 significant figures. a) 3 / 7 b) 8 / 130 2. Calculate the following and give your answers correct to 4 significant figures. a) 2.34 x 5.1 / 4.23 b) 1.89 + 0.57 x 3.4 - 2.21 / 56 3. Express the following quantities using the units specified in the brackets and correct your answrs 2 decimal places. a) 43209g (kg)_____________ b) 21s (h)______________

最佳解答:

1. Light travles at 299792.5 km/s. Thedistance between the Sun and the Earth is 149597890 km. Estimate the approximate time ( in seconds) required by light to travel from the Sun to the Earth. 149597890 / 299792.5 = 499 seconds p. 3 3. Express the following numbers in scientific notation. a) 12345.6789 = 1.23456789 * 10^ - 4 b) 1230000000 = 1.23 * 10^9 c) 0.00987 = 9.87 * 10^3 p. 5 1. Express the following fractions as decimals and correct your answers to 3 significant figures. a) 3 / 7 = 0.4285... = 0.429(3 sig.) b) 8 / 130 = 0.06153... = 0.0615(3 sig.) 2. Calculate the following and give your answers correct to 4 significant figures. a) 2.34 x 5.1 / 4.23 = 2.8212... = 2.821(4 sig.) b) 1.89 + 0.57 x 3.4 - 2.21 / 56 = 3.7885...= 3.789(4 sig.) 3. Express the following quantities using the units specified in the brackets and correct your answrs 2 decimal places. a) 43209g (kg)__= 43209 / 1000 = 43.209 = 43.21kg(2 dec.)___________ b) 21s (h)___= 21 / 3600 = 0.005833... = 0.01 h(2 dec.)___________

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