a) In procedure 1: when you drop the mass holder, the system rotates at angular
ID: 2250534 • Letter: A
Question
a) In procedure 1: when you drop the mass holder, the system rotates at angular acceleration ?. If you wrapped the string around a larger diameter pulley and dropped the mass holder, the acceleration of the system would be
more than ?
exactly ?
less than ?
b) In procedure 2 trial 1: suppose the system is rotating clockwise when the metal disk is dropped on it. The direction of the frictional force is
counter-clockwise on the disk zero on the system
clockwise on the disk, counter-clockwise on the system
clockwise on the disk and the system
counter-clockwise on the disk and the system
zero on the disk, clockwise on the system
counter-clockwise on the disk, clockwise on the system
zero on the disk, counter-clockwise on the system
clockwise on the disk, zero on the system
zero on the disk and the system
c) In procedure 2 trial 1: suppose the coefficient of friction between the metal disk and the system is ?. If the coefficient of frction is increased, what will happen to ?f, the final angular speed of the system, and ?E, the energy lost from the system during the time the metal disk reaches the same speed as the system?
?f increases, ?E decreases
?f and ?E remain the same
?f increases, ?E increases
?f decreases, ?E increases
?f decreases, ?E remain the same
?f increases, ?E remain the same
?f decreases, ?E decreases
?f remains the same, ?E increases
?f remains the same, ?E decreases
Explanation / Answer
a)
less than ? as ? is inversaly propotional to r
b)
clockwise on the disk, counter-clockwise on the system because disk will accelerate and system will decelerate
c)
?f and ?E remain the same . as friction energy dissipation is equal to F.s. here f is increasing but s will decrease which will counter balance f and F.s will be constant.
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