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Chapter 8,9,10 – Review

Chapter 8,9,10 – Review. 5. 0. 60. 0. An object at rest begins to rotate with a constant angular acceleration. If this object rotates through an angle q in the time t , through what angle did it rotate in the time ½ t ?. ½ q ¼ q ¾ q 2 q 4 q. 1. 2. 5. 4. 3. 0. 60. 0.

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Chapter 8,9,10 – Review

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  1. Chapter 8,9,10 – Review

  2. 5 0 60 0 An object at rest begins to rotate with a constant angular acceleration. If this object rotates through an angle q in the time t, through what angle did it rotate in the time ½t? • ½ q • ¼ q • ¾ q • 2 q • 4 q

  3. 1 2 5 4 3 0 60 0 You are using a wrench to loosen a rusty nut. Which arrangement will be the most effective in loosening the nut? • 1 • 2 • 3 • 4 • All are the same

  4. 1m 1kg 5 0 60 0 A 1kg ball is hung at the end of a rod 1m long. If the system balances at a point on the rod 0.25m from the end holding the mass, what is the mass of the rod ? • ¼ kg • ½ kg • 1 kg • 2 kg • 4 kg

  5. v1 v2 5 0 60 0 Water flows through a 1 cm diameter pipe connected to a ½ cm diameter pipe. Compared to the speed of the water in the 1 cm pipe, the speed in the ½ cm pipe is: • one quarter • one half • The same • double • four times

  6. 5 0 60 0 A helium balloon in an air-filled glass jar floats to the top. If the air is replaced with helium, what will happen to the helium balloon? • It still floats at the top because it has positive bouyancy • It stays in the middle because it has neutral bouyancy • It sinks to the bottom because it has negative bouyancy • The balloon shrinks in size due to the surrounding helium. • The balloon grows in size due to the lack of surrounding air.

  7. Answers 2 – q = qo + wo t + ½ a t2 2 – t = r F sinq , so long lever arm and at a right angle makes the biggest torque 3 – 1 kg, the mass of the rod acts at its center of mass which happens to be the same distance from the pivot as the 1-kg hanging mass. 5 – four times. A1 v1=A2 v2 and A is proportional to the diameter squared 3 – it sinks due to negative bouyancy, now the inside and outside of the balloon are both helium so have the same density, but the balloon’s rubber has a higher density so the overall density of the balloon is slightly higher than the surrounding helium

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