PHYSICS4A_2025_ZiTongCheng

Introduction

1. Zitong Cheng

2.
  


3. Electrical Engineering

4. I choose to study Eletrical Engineering because it is easier to find a good job, and I will have more opportunity to design my own things, and gets pay.

5. My goal right now is to get a great GPA to transfer to UC shools!

6.linkedin.com/in/zitong-cheng-3267b3353

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Rotational Kinematics Lab--ZiTong Cheng

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 1. Use the velocity components to determine the direction of the velocity vector. Is it in the expected direction? The linear velocity for points at different radii (3 cm, 8 cm, and 15 cm) is 0.13 m/s, 0.23 m/s, and 0.42 m/s respectively. The direction of the linear velocity is tangent to the circular path, which is the expected behavior in rotational motion. From these values, the corresponding angular velocities are approximately: 4.33 rad/s at 3 cm 2.88 rad/s at 8 cm 2.80 rad/s at 15 cm 2. Analyze enough different points in the same video to make a graph of the speed of a point as a function of distance from the axis of rotation. What quantity does the slope of this graph represent? We created a graph showing how the speed of a point changes with distance from the axis of rotation, using the data: 3 cm → 0.13 m/s, 8 cm → 0.23 m/s, 15 cm → 0.42 m/s. The slope of this graph represents the angular velocity. Based on these points, the angular velocity is relatively consistent acros...
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