D
Deena Ozzy
Guest
...physics question!? An American football game has been canceled because of bad weather in Cleveland, and two retired players are sliding like children on a frictionless ice-covered parking lot. William Perry, mass 162 kg, is gliding to the right at 7.70 m/s, and Doug Flutie, mass 81.0 kg, is gliding to the left at 10.7 m/s along the same line. When they meet, they grab each other and hang on.
(a) What is their velocity immediately thereafter?
m/s
(b) What fraction of their original kinetic energy is still mechanical energy after their collision?
%
(c) The athletes had so much fun that they repeat the collision with the same original velocities, this time moving along parallel lines 1.10 m apart. At closest approach they lock arms and start rotating about their common center of mass. Model the men as particles and their arms as a cord that does not stretch. Find the velocity of their center of mass.
m/s
(d) Find their angular speed.
rad/s
(e) What fraction of their original kinetic energy is still mechanical energy after they link arms?
in %
(a) What is their velocity immediately thereafter?
m/s
(b) What fraction of their original kinetic energy is still mechanical energy after their collision?
%
(c) The athletes had so much fun that they repeat the collision with the same original velocities, this time moving along parallel lines 1.10 m apart. At closest approach they lock arms and start rotating about their common center of mass. Model the men as particles and their arms as a cord that does not stretch. Find the velocity of their center of mass.
m/s
(d) Find their angular speed.
rad/s
(e) What fraction of their original kinetic energy is still mechanical energy after they link arms?
in %