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Unformatted text preview: huynh (hph268) HW #1 clark (56485) 1 This printout should have 16 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Consider the expression 2 radicalBigg g , where is length and g is gravitational acceleration in units of length divided by time squared. Evaluate its units. 1. s correct 2. m 3. s m 4. m 2 5. m s 6. s 2 7. parenleftBig m s parenrightBig 2 8. parenleftBig s m parenrightBig 2 Explanation: [ ] = m and [ g ] = m s 2 . 2 and are constants, so radicalBigg [ ] [ g ] = radicalbigg m m s 2 = radicalbigg m s 2 m = s 2 = s . 002 10.0 points A graph of a straight line going through two points is shown below. b b y 5 3 1 0 1 2 3 4 5 x 5 4 3 2 1 1 2 3 4 5 What is the equation of this line? 1. y = + 2 9 x + 8 9 2. y = 9 2 x + 8 9 3. y = 2 9 x + 4 4. y = 9 2 x 8 9 5. y = + 2 9 x + 4 6. y = + 2 9 x 8 9 correct 7. y = + 9 2 x 4 8. y = 2 9 x 8 9 9. y = + 2 9 x 4 10. y = + 9 2 x 8 9 Explanation: Let : ( x 1 , y 1 ) = ( 5 , 2) ( x 2 , y 2 ) = (4 , 0) . The slope is m = (0) ( 2) (4) ( 5) = + 2 9 . Using 2 points ( y y 1 ) = m ( x x 1 ) huynh (hph268) HW #1 clark (56485) 2 y = m ( x x 1 ) + y 1 , so y = + 2 9 ( x + 5) 2 = + 2 9 x 8 9 . 003 (part 1 of 2) 10.0 points Consider two planets with uniform mass dis tributions. The mass density and the radius of planet 1 are 1 and R 1 , respectively, and those of planet 2 are 2 and R 2 What is the ratio M 1 M 2 of their masses? 1. M 1 M 2 = parenleftbigg 1 2 parenrightbiggparenleftbigg R 1 R 2 parenrightbigg 3 correct 2. M 1 M 2 = parenleftbigg 1 2 parenrightbiggparenleftbigg R 2 R 1 parenrightbigg 3 3. M 1 M 2 = parenleftbigg 2 1 parenrightbiggparenleftbigg R 1 R 2 parenrightbigg 4. M 1 M 2 = parenleftbigg 2 1 parenrightbiggparenleftbigg R 1 R 2 parenrightbigg 2 5. M 1 M 2 = parenleftbigg 2 1 parenrightbiggparenleftbigg R 1 R 2 parenrightbigg 3 6. M 1 M 2 = parenleftbigg 2 1 parenrightbiggparenleftbigg R 2 R 1 parenrightbigg 3 7. M 1 M 2 = parenleftbigg 1 2 parenrightbiggparenleftbigg R 1 R 2 parenrightbigg 2 8....
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 Spring '11
 Zao
 Physics

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