Physics Work Homework.docx

Physics Work Homework.docx - Mariah Duran Professor Tsen M...

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Mariah Duran Professor Tsen M, W, F 11:50 Physics Work Homework 1.(a) How much work is done to move a 1.80 X 10 3 -kg Chevrolet Tahoe from rest to 35.2 m/s on a level road? s 35.2 m / ¿ ¿ W = KE = 1 2 m v 2 =( 1.80 × 10 3 kg ) ¿ (b) If this takes place over a distance of 251 m, what is the average net force applied to the car? W = F ∆ x 1120000 J = 251 m F= 4460 N 2. A carte sitting on a flatbed truck which is moving at an acceleration of a = 2.78 m/s 2 . Suppose that the crate does not slip as the truck undergoes a displacement, whose magnitude is r = 111 m. Determine the total work done on the crate by all of the forces acting on it. F = ma = 155 kg ( 2.78 m / s 2 ) = 430.9 N W = Fcosθ ∆x = 430.9 N × cos ( 0 ) × 111 m = 47730 J 3. A motorcyclist is trying to leap across a canyon by driving horizontally off the higher side of the canyon at a speed of 78.0 m/s. If air resistance is neglected and the difference in height on two sides of the canyon is 252 m, what is the speed of the motorcycle as it reaches the lower side of the canyon? (There are no conservative forces) mgh + 1 2 mv 2 = mgh + 1 2 m v 2 1 2 ( 78.0 m / s ) 2 + ( 9.80 m / s 2 ) ( 252 m ) = 1 2 ( v 2 ) 3042 m 2 / s 2 + 2469.6 m 2 / s 2 = 1 2 ( v 2 ) v f = 105 m / s (We can only take out the mass in velocity or height problems
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  • Spring '08
  • Cavatto
  • Force, Mariah Duran, V f, μk Fsinθ, Professor Tsen

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