A 77 kg sprinter is running the 100 m dash. At one instant, earlyin the race, his acceleration is 4.7 m/s^2.
1. What total force does the track surface exert on the sprinter?Assume his acceleration is parallel to the ground. Give your answeras a magnitude.
2. What total force does the track surface exert on the sprinter?Assume his acceleration is parallel to the ground, and give youranswer as an angle with respect to the horizontal.
3. This force is applied to one foot (the other foot is in theair), which for a fraction of a second is stationary with respectto the track surface. Because the foot is stationary, the net forceon it must be zero. Thus the force of the lower leg bone on thefoot is equal but opposite to the force of the track on the foot.If the lower leg bone is 60 degrees from horizontal,what is thecomponents of the legâs force on the foot in the direction parallelto the leg? (Force components perpendicular to the leg can causedislocation of the ankle joint.)
4. What is the components of the legâs force on the foot in thedirection perpendicular to the leg?
Any help will be appreciated. Thanks :)
A 77 kg sprinter is running the 100 m dash. At one instant, earlyin the race, his acceleration is 4.7 m/s^2.
1. What total force does the track surface exert on the sprinter?Assume his acceleration is parallel to the ground. Give your answeras a magnitude.
2. What total force does the track surface exert on the sprinter?Assume his acceleration is parallel to the ground, and give youranswer as an angle with respect to the horizontal.
3. This force is applied to one foot (the other foot is in theair), which for a fraction of a second is stationary with respectto the track surface. Because the foot is stationary, the net forceon it must be zero. Thus the force of the lower leg bone on thefoot is equal but opposite to the force of the track on the foot.If the lower leg bone is 60 degrees from horizontal,what is thecomponents of the legâs force on the foot in the direction parallelto the leg? (Force components perpendicular to the leg can causedislocation of the ankle joint.)
4. What is the components of the legâs force on the foot in thedirection perpendicular to the leg?
Any help will be appreciated. Thanks :)
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