Homework-4-calm-Sol

Homework-4-calm-Sol - HW4 5-2 2 In a grocery store you push a 12.5-kg shopping cart with a force of F= 14.0 N If the cart starts at rest how far

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HW4 5-2 2. In a grocery store, you push a 12.5-kg shopping cart with a force of F= 14.0 N . If the cart starts at rest, how far does it move in 3.00 s? sol 5- 2. 2 ˆ (14.0 N) m ˆ 1.12 12.5 kg s m ⎛⎞ == = ⎜⎟ ⎝⎠ Fx ax G G 22 2 11 m 1.12 (3.00 s) 5.04 m s xa t Δ= Δ = = 5-10 10. •• A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 350 10 5 ., × kg its speed is 27.0 m/s, and the net braking force is F=430 10 5 × N (a) what is its speed 7.50 s later? (b) How far has it traveled in this time? Sol 5- 10. (a) Determine the acceleration. 5 52 – 4.30 10 N m 1.23 3.50 10 kg s F a m × = × Find the speed. 0 2 mm 27.0 1.23 (7.50 s) 17.8 m s s s vv a t =+= + = (b) () ( ) 2 2 2 ss 0 m s 17.8 27.0 168 m 2 21 . 2 3 vv x a Δ= = = 5-14 14. •• On vacation, your 1300-kg car pulls a 540-kg trailer away from a stop light with an acceleration of a=190 2 .. m/s (a) What is the net force exerted by the car on the trailer? (b) What force does the trailer exert on the car? (c) What is the net force acting on the car? Sol 5-14. m = mass of the trailer M = mass of the car (a) The trailer is accelerating at 1.90 m/s 2 , so net 2 m (540 kg) 1.90 1.0 kN s Fm a = (b) The car exerts a force of 1.0 kN on the trailer. The trailer exerts an equal and opposite force on the car. The trailer exerts a net force of 1.0 kN on the car.
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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-4-calm-Sol - HW4 5-2 2 In a grocery store you push a 12.5-kg shopping cart with a force of F= 14.0 N If the cart starts at rest how far

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