What is the correct answer (reported to the proper number of significant figures

Question

What is the correct answer (reported to the proper number of significant figures) for the following calculation: (1815 - 1806) times (9.11 times 7.92)? Round the number 0.007222 to three significant figures. If an object is accelerating at a rate of 25 m/s^2, how fast will it be moving (in m/s) after 1.50 min? (Assume an initial velocity of zero.) A wooden object has a mass of 10.782 g and occupies a volume of 13.72 ml. What is the density of the object determined to an appropriate number of significant figures? The density of lead is 11.4 g/cm^3. What is the mass of a lead ball with a radius of 0.50 mm? Convert 3.337 g/cm^3 to kg/cm^3. The variables x, v, and a have dimensions L, L/T, and L/T^2, respectively. An equation relating these variables under particular conditions is v^n = 2ax, where n is a positive integer. What must n be? Find the radian measure of one of the angles of a regular pentagon. (The angles are all the same in a regular pentagon.) In degrees, the formula for the sum of the interior angles of an n-sided polygon is (n - 2) times 180 degree. The recommended adult dose of Elixophyllin a drug used to treat asthma, is 6.0 mg/kg of body mass. Calculate the dose in milligrams for a 210 lb person. A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged: A) positive. B) negative. C) neutral. D) none of the given answers

Explanation / Answer

1) (1815-1806)x(9.11*7.92) = 9*72.1512 = 649.3608

2) uptothree significant figures 0.00722

3) a = 25 m/s^2

t = 1.5 min = 1.5*60 sec

Vo = 0 m/sec

using kinamtic equations

V = Vo+(a*t) = 0+(25*1.5*60) = 2250 m/sec

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