1-On a frictionless, horizontal air table, puck A (with mass 0.250 k g ) is movi

Question

1-On a frictionless, horizontal air table, puck A (with mass 0.250kg ) is moving toward puck B (with mass 0.360kg ), that is initially at rest. After the collision, puck A has a velocity of 0.116m/s to the left, and puck B has velocity 0.660m/s to the right.

Calculate the change in the total kinetic energy of the system that occurs during the collision.

2An airplane propeller is rotating at 1870

rev/min .

A-Compute the propeller's angular velocity in

rad/s.

B-How long in seconds does it take for the propeller to turn through 40

%u2218?

Explanation / Answer

-0.116*0.25+0.66*0.36=-0.2086=0.25*v

v=0.8344

change in total kE=0.5(0.25*0.8344*0.8344-0.116*0.116*0.25-0.36*0.66*0.66)=0.01387584Joule

Angular velocity=1870*pi/60=97.9rad/s

time taken of for 40 degree=0.6981317007977318 radian

0.6981317007977318/97.9=0.00713106946677969152196118488253 Seconds it takes

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