- #1
shin777
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mass of color wheel is 133.4g and raidus is 12.7cm. The moment of inertia for disk is I = (1/2)mr^s. We used strobescope and color wheel and measured the time of how long it took till color wheel's yellow part looked stop. It took 2.1s for speed up and 1.5 second for speed down. Maximum value we could go with stroboscope was 525 flash/min.
second highest 475 flash/min
third highest 425 flash/min
question 1) convert maximum angular speed of wheel to rev/s.
question 2) convert maximum angular speed to wheel to rad/s
question 3)Find angular acceleration in rev/s^2 auuming it is constant.
question 4)Repeat question 3 when the wheel was turned off.
question 5)find the angle turned through during the acceleration in question 3, in rev.
question 6)Find I, the moment of inertia for the color wheel in kg m^2.
question 7) find torque exerted by motor during the acceleration of the color of wheel in units of
N m.
question 8)Multiply highest strobe setting which "stopped motion" by one. Multiply the second highest setting by two, and the third by three. Compare these products and then explain what is happening physically for the three highest settings which "stopped" the motion of the wheel. What is the wheel doing compared to the strobe flash rate for each of these three speeds?
question9) State the true direction of motion of the disk.
question 10)How will the disk appear to move relative to its true motion if the strobe is flashhing slightly faster than the true rate of revolution, in the same direction or in the opposite direction?
question 11)Repeat question 10 for the strobe flashing slightly slower than the true rate of revolution.
second highest 475 flash/min
third highest 425 flash/min
question 1) convert maximum angular speed of wheel to rev/s.
question 2) convert maximum angular speed to wheel to rad/s
question 3)Find angular acceleration in rev/s^2 auuming it is constant.
question 4)Repeat question 3 when the wheel was turned off.
question 5)find the angle turned through during the acceleration in question 3, in rev.
question 6)Find I, the moment of inertia for the color wheel in kg m^2.
question 7) find torque exerted by motor during the acceleration of the color of wheel in units of
N m.
question 8)Multiply highest strobe setting which "stopped motion" by one. Multiply the second highest setting by two, and the third by three. Compare these products and then explain what is happening physically for the three highest settings which "stopped" the motion of the wheel. What is the wheel doing compared to the strobe flash rate for each of these three speeds?
question9) State the true direction of motion of the disk.
question 10)How will the disk appear to move relative to its true motion if the strobe is flashhing slightly faster than the true rate of revolution, in the same direction or in the opposite direction?
question 11)Repeat question 10 for the strobe flashing slightly slower than the true rate of revolution.
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