hw #6

# hw #6 - BENG109 Bioengineering Statics & Dynamics Due:...

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BENG109 Bioengineering Statics & Dynamics Due: Friday, March 13 1. An uncontrolled car traveling 125 km/h strikes a highway crash cushion in which the car is brought to rest by successively crushing steel barrels. The car has a mass of 1250 kg and that is travels 4 m before coming to a stop. The force needed to crush the barrels (which is equal and opposite to the force needed to stop the car) is a linear function of position, Force = C x. Use the method of work-energy to determine the value of the constant, C. 2. In the triple jump an athlete gets a running start and tried to leap as far as he can with a hop, step, and jump. Shown in the figure below is the initial hop of an athlete. Assuming that he approaches the takeoff line from the left with a horizontal velocity of 25 ft/s, remains in contact with the ground for 0.15s, and takes off at a 50 o angle with a velocity of 30 ft/s, determine the vertical component of the average impulsive force exerted by the ground on his foot. Give your answers in terms of weight, W, of the athlete. 3.

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## This note was uploaded on 01/25/2011 for the course BENG 109 taught by Professor Ping during the Winter '06 term at UCSD.

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hw #6 - BENG109 Bioengineering Statics & Dynamics Due:...

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