2 Problem Assignment For Chapter 1

2 Problem Assignment For Chapter 1 - C hapter T wo P roblem...

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Chapter Two Problem Assignment 1. A weather rocket is launched with an acceleration of 100 ft/s^2. If the acceleration occurs for 30 seconds, how high is the rocket in feet? In meters? In miles? Work : Conversions / 100ft 1s2 x 1mi/5280ft = . / 0 0189mi s2 / 100ft s2 x 1m/3.28ft = . / 30 49m s2 a = / 100 ft s2 , t = 30s, x = ?, Vo = 0 m/s x = (0f/s)t + ½( / 100ft s2 )( ) 30s 2 x = ( / 50ft s2 )900s x = 45,000 ft Feet to meters : 45,000ft x . 1m3 28ft = 13,719.5122 = 13,720m Feet to miles : 45,000ft x 1mi5280ft = 8.522727273 = 8.52mi Answers: x = 45,000ft, 13,720m, and 8.52mi 2. How much higher does the rocket go after its fuel is used up? Work : = , , = , = , = , = / x 45 000ft Vo 0ft Vf ? t 30s a 100ft s2 / 100ft s2 = (Vf – 0ft)/30s Vf = 3000ft/s Gravitational acceleration conversion : . 9 8ms2 x . 3 28ft1m = . / 32 14ft s2 a = -32.14ft, Vo = 3000ft/s, Vf = 0ft/s, t = ? a = Vf Vit -32.144ft/ s2 = ( / - / )/ 0ft s 3000ft s t -32.144ft/ s2 = - / 3000ft st t = 93.33s x = ?, Xo = 0ft, Vo = 3000ft/s, t = 93.33s, a = -32.14ft/ s2 x = xo + Vot + ½ at2
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x = 0ft + (3000ft/s)93.33s + ½ (-32.14ft/
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2 Problem Assignment For Chapter 1 - C hapter T wo P roblem...

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