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Published byDarrin Idell Modified over 3 years ago

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1.Rotational inertia is measured in Kg m 2

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2.Set up the formula to convert 45 rev/min into rad/s 45 rev x 2 rad x 1 min min rev 60 s

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3. “ ” is the symbol for Angular velocity

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4.In the formula W = , W represents Work

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5. “L” is the symbol for Angular momentum

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6.A race down an incline between a ring and a hollow sphere of the same mass and radius would be won by the Hollow sphere I ring = mr 2 and I hollow sphere = 2/3 mr 2

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7. Convert 30 revolutions into radians 30 rev x 2 rad = 188 rad rev

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8. “ ” is the symbol for Angular acceleration

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9. The symbol (variable) for rotational inertia is “I”

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10. If the formula for kinetic energy is KE = ½ m v 2, the corresponding formula for rotational kinetic energy is KE = ½ I 2

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11. “ ” is the symbol for torque

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12. “ ” is the symbol for Angular displacement

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13. An ice skater having a rotational inertia of 30 kgm 2 is spinning at 2.5 rad/s. If she increases her inertia to 45 kgm 2, what will be her new angular velocity? I = I’ ’ (30 kgm 2 ) (2.5 rad/s) = (45 kgm 2 ) ’ 1.67rad/s = ’

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14. How many revolutions are represented by 75 radians? 75 rad x 1 rev = 12 rev 2 rad

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15. Set up the formula to convert 120 rad/s to rev/min. 120 rad x 1 rev x 60 s = 1146 rev s 2 rad 1 min min

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16. Torque is equal to the applied force times _____ radius

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17. Rotational inertia depends on _____ and _____ Mass and radius

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18. The label for torque is N m

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19. ____ is the motion that results from the sum of two angular velocities Precession

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20. What happens to the rotational inertia of an object if its mass moves closer to the axis of rotation? The rotational inertia decreases.

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