Practice_Test_4

# Practice_Test_4 - 1 Practice Test 4 1 A bicycle is moving...

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1 Practice Test 4 1. A bicycle is moving forward at 4.5 m.s -1 . If the diameter of the wheel is 0.75 m, what is the angular velocity of a point on the rim of the wheel? a. 12 rad.s -1 b. 15 rad.s -1 c. 9 rad.s -1 d. 7.5 rad.s -1 2. What is the angular velocity of a disc rotating at 120 rpm in rad/s? a. 120 π b. 40 π c. 10 π d. 4 π 3. A tangential force of 10 N is applied to a disc initially at rest and it attains an angular velocity of 120 rpm in 20 s. What is the angular acceleration of the disc? a. π /2 rad.s -2 b. π /4 rad.s -2 c. π /5 rad.s -2 d. π /8 rad.s -2 4. If the radius of the wheel in question 3 is 0.5 m, what is the torque on the wheel? a. 10 m.N b. 5 m.N c. 3 m.N d. 1.5 m.N 5. What is the moment of inertia of the disc in question 3? a. 25/ π kg m 2 b. 25 kg m 2 c. 5/ π kg m 2 d. 5 kg m 2

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2 6. What is the moment of inertia of a 10-kg disc of radius 15 cm? a. 225 kg m 2 b. 2.25 kg m 2 c 0.11 kg m 2 d. 0.011 kg m 2 7. If a tangential force of 200 N is applied to the disc in question 6, what is the torque it produces? a. 200 m.N b. 50 m.N c. 30 m.N d. 20 m.N 8. What is the angular acceleration of the disc in question 7? a. 5 rad.s -2 b. 273 rad.s -2 c. 52 rad.s -2 d. 65 rad.s -2 9. What is the angular velocity of this disc in question 8 after 1.2 s? a. 328 rad.s -1 b. 250 rad.s -1 c. 122 rad.s -1 d. 5.6 rad.s -1 10. What is the linear velocity of a point on the rim of the wheel after 1.2 s? a. 3.0 m.s -1 b. 15 m.s -1 c. 36 m.s -1 d. 49 m.s -1 11. What is the angular momentum of the disc after 1.2 s? a. 36.1 kgm 2 s -1 b. 48 kgm 2 s -1 c. 32.6 kgm 2 s -1 d. 18.9 kgm 2 s -1

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4 18. What is the cross product of vectors A and B if A = 2 i – 5 j and B = 6 i + 2 j ? a. 34 k b. –34 k c. 34 j d. -34 j 19. What is the torque of a force F = 5 i – 2 j about a point distance r from the force where r = -6 i ? a. 6 i b. 12 k c. –24 k d. 24 k 20. A disc of moment of inertia 8 kg m 2 is rotating at 40 rpm. What is its kinetic energy of rotation? a.
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Practice_Test_4 - 1 Practice Test 4 1 A bicycle is moving...

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