Assignment:
1. Explain the difference between linear speed and rotational speed. Include formula difference and how rotational speed is changed to linear speed.
2. A bicycle has wheels with a 30-centimeter radius. If smaller wheels with a 25-centimeter radius are installed, what is the change in linear speed of the bicycle if the wheels rotate at 1 revolution per second?
In terms of rotational inertia, explain why:
- It's hard to walk without bending your knees.
- Short-legged people step more quickly than long-legged people do.
- You can swing a baseball bat faster than a long one of the same weight.
Answer the following questions:
- Explain how skaters can quickly go from a slow to fast spin and vice versa.
- What happens to their angular velocity and moment of inertia?
- Is an external torque required? Explain.
What is a gyroscope and how is it used as a navigational aid?
To tighten a bolt, you push with a force of 80 Newtons at the end of a wrench handle that is 0.25 meters from the axis of the bolt.
- What torque are you exerting?
- If you move your hand inward to be only 0.10 meters from the bolt, what force do you have to exert to achieve the same torque?
- Do your answers depend on the direction of your push relative to the direction of the wrench handle?
Attachment:- Pendulum and Calculation of g.rar