Homework-3-calm-Sol

Homework-3-calm-Sol - Homework 3 4-5 9 An electron in a...

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Homework 3 4-5 •• An electron in a cathode-ray tube is traveling horizontally at 210 10 9 ./ × cm s when deflection plates give it an upward acceleration of (a= 5.3 x 10 17 cm/s 2 ) (a) How long does it take for the electron to cover a horizontal distance of 6.20 cm? (b) What is its vertical displacement during this time? Choose y to be up, x in the direction of the electron’s motion. Sol 4-5.(a) 0 x x xv t =+ Note: it does not depend on the acceleration. The x-motion is independent of the y-motion, and the acceleration is only upwards. Now solve for t: 0 9 cm s –9 6.20 cm–0 cm 2.10 10 2.95 10 s x xx t v = = × (b) 21 7 9 2 00 2 11 c m 0 cm 0 cm 5.30 10 (2.95 10 s) 2.31 cm 22 s yy yy v t a t ⎛⎞ =+ + = + + × × = ⎜⎟ ⎝⎠ 4-8 The great, gray-green, greasy Zambezi River flows over Victoria Falls in south central Africa. The falls are approximately 108 m high. If the river is flowing horizontally at v 0x =3.6 m/s just before going over the falls, what is the speed of the water when it hits the bottom? Assume the water is in freefall as it drops. Sol 4-8 There is no initial component of velocity in the y -direction. 2 0 mm 2 0 2 9.81 (0 m –108 m) 2119 ss vv g y =− = = 2 2 2 3.60 2119 46.2 m s s s xy vvv = + = 4-14 14. •• A mountain climber jumps a 3.0-m wide crevasse by leaping horizontally with a speed of v h = 8.0 m/s. (a) If the climber’s direction of motion on landing is −° 45 , what is the height difference between the two sides of the crevasse? (b) Where does the climber land?
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This note was uploaded on 07/02/2011 for the course PHYS 201 taught by Professor Woodahl during the Fall '09 term at Indiana.

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Homework-3-calm-Sol - Homework 3 4-5 9 An electron in a...

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