* BIO Leg injuries during car collisions During a car collision, the knee, thighbone, and hip can sustain a force no greater than 4000 N. Forces that exceed this amount could cause dislocations or fractures. Assume that in a collision a knee stops when it hits the car’s dashboard. Also assume that the mass of the body parts stopped by the knee is about 20% of the total body mass. (a) What minimum stopping time interval is needed to avoid injury to the knee if the person is initially traveling at 15 m/s (34 mi / h)? (b) What is the minimum stopping distance?
* BIO Leg injuries during car collisions During a car collision, the knee, thighbone, and hip can sustain a force no greater than 4000 N. Forces that exceed this amount could cause dislocations or fractures. Assume that in a collision a knee stops when it hits the car’s dashboard. Also assume that the mass of the body parts stopped by the knee is about 20% of the total body mass. (a) What minimum stopping time interval is needed to avoid injury to the knee if the person is initially traveling at 15 m/s (34 mi / h)? (b) What is the minimum stopping distance?
* BIO Leg injuries during car collisions During a car collision, the knee, thighbone, and hip can sustain a force no greater than 4000 N. Forces that exceed this amount could cause dislocations or fractures. Assume that in a collision a knee stops when it hits the car’s dashboard. Also assume that the mass of the body parts stopped by the knee is about 20% of the total body mass. (a) What minimum stopping time interval is needed to avoid injury to the knee if the person is initially traveling at 15 m/s (34 mi / h)? (b) What is the minimum stopping distance?
While playing basketball in PE class, a student lost her balance after making a lay-up and collided with the padded wall behind the basket. Her 37 kg body decelerated from 6.6 m/s to 0 m/s in 0.21 seconds.
a) Determine the magnitude of the average force in Newtons acting on the student's body during the impact with the padded wall.
b)
Complete the sentences correctly.
Stunt car A and stunt car B are identical cars with the same mass of 45.1 kg. They are both traveling at 34.5 m/s. Stunt car A
crashes into a brick wall, whereas stunt car B crashes into a large pile of soft sand. They both come to a complete stop after
the impact.
Stunt car A experiences a
of time.
over a
Stunt car B experiences a
over a
of time.
Because of the force experienced by stunt car A, it will sustain
damage than stunt car B.
A 1000kg "Smart Car' is stopped at an intersection. A large 4000kg SUV approaches from behind with a velocity
of 15m/s and finds itself on a sheet of ice, unable to slow down or change direction. The cars collide in a perfectly
inelastic collision which lasts 0.1 seconds.
a. Calculate the average force and acceleration that each car experiences during the collision.
b. Calculate the average net force that would be exerted on a driver of mass 50 kg if he/she was in either car.
Compare these forces to weight, e.g., twice as large as gravity.
Chapter 6 Solutions
College Physics: Explore And Apply, Volume 2 (2nd Edition)
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