# ps4a9 - Physics 111.01 PS 4a(9 Walker P 4.10 An astronaut...

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Physics 111.01 September 22, 2008 PS 4a (9) Walker P. 4.10. An astronaut on the planet Zircon tosses a rock horizontally with a speed of [6.35] m/s. The rock falls through a vertical distance of 1.40 m and lands a horizontal distance of 7.75] m from the astronaut. What is the acceleration of gravity on Zircon? (Neglect air resistance.) h g d v 0x y x It is better to solve this problem all in symbols, putting in numerical values later. First - find the time for the vertical motion to take place. This is falling from y = h to y = 0, with v 0 y = 0. 2 1 00 2 2 1 2 2 0( 0 ) 2 2 yy yy v t g t hg t gt h h t g =+− =+ − = = Next, analyze the horizontal motion. We know the initial velocity in the x direction, so the distance is 2 xx h dv tv g == Finally, what were we supposed to find? The value of g ! So, solve the equation above for g .

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() ( ) 2 2 0 2 2 2 0 2 2 2 2 6.35 m/s 1.40 m 2 1.880 m/s 7.75 m x x vh d g g d = == = Walker P. 5.15. A [59] kg parent and a 16 kg child meet at the center of an ice rink. They place their hands together and push.
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## This note was uploaded on 05/13/2010 for the course PHYSICS 111 taught by Professor Staff during the Fall '08 term at S.F. State.

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ps4a9 - Physics 111.01 PS 4a(9 Walker P 4.10 An astronaut...

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