Lab 7:

1. Procedure I.2
The measured mass of the rotating cylinder is...

• A. 0.47 kg
• B. 1.21 kg
• C. 0.36 kg
• D. 0.067 kg
• E. 0.59 kg

2. he next questions of Procedure I will be based on the following video of a simulation.

Procedure I.3
The radius of revolution of the rotating cylinder is...

• A. 0.7 m
• B. 0.256 m
• C. 0.54 m
• D. 0.312 m
• E. 0.82 m

3. Using your phone stop watch measure the time taken for 10 revolutions and then calculate the period or the time taken for one revolution.

Procedure I.8
The time taken by the cylinder to make one complete revolution is about ...

• A. 2.33 s
• B. 2.01 s
• C. 8.5 s
• D. 1.04 s
• E. 1.6 s

4. Procedure I.9

The speed with which the cylinder is rotating is...

• A. 0.786 m / s
• B. 0.356 m /s
• C. 2.745 m / s
• D. 2.188 m / s
• E. 5.534 m / s

5. Procedure I.10
The centripetal force exerted by the spring on the rotating cylinder is...

• A. 0.871 N
• B. 3.215 N
• C. 2.876 N
• D. 4.893 N
• E. 2.401 N

6. The questions for Procedure II will be based on the following video of a simulation.
Procedure II.1
The hanging mass that extends the spring by the same amount as the rotating cylinder is...

• A. 4.432 kg
• B. 1.16 kg
• C. 0.21 kg
• D. 0.347 kg
• E. 0.145 kg

7. Procedure II.2
The force exerted on the spring by the hanging mass that causes the same extension as the rotating object is...

• A. 4.54 N
• B. 2.05 N
• C. 1.54 N
• D. 3.401 N
• E. 0.9734 N

8. Procedure II.3
The ratio of the centripetal force on the rotating cylinder to the weight of the hanging mass the causes the same extension of the spring is...

• A. 0.75
• B. 0.945
• C. 1.12
• D. 1.23
• E. 0.88

9. (Skip Procedure II.4 & II.5) Procedure II.6
The centripetal force on the rotating cylinder and the weight that extends the spring by the same amount are expected to be equal. So the expected value of the ratio them is 1. The percentage error between the experimental ratio and the expected value of one is...

• A. 23.564%
• B. 5.462%
• C. 8.664%
• D. 15.632%
• E. 2.835%