PHYSICS HW 2 PARTS, 1 OR 2 SOURCES PER PART, 4-6 PAGES TOTAL

PART 1 Answer all of the following questions. Do not send in a partially completed assignment. Answer each question as completely as possible, but do not merely copy answers from your reading materials. If you cite a reference in the text, explain the meaning of the citation.

Explain the difference between linear speed and rotational speed. Include formula difference and how rotational speed is changed to linear speed.
A bicycle has wheels with a 30-centimeter radius. If smaller wheels with a 25-centimeter radius are installed, what is the change in the 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?
PART 2
1. Imagine a superfast fish that is able to swim faster than the speed of sound in water. Would this fish produce a “sonic boom”?
2. Use the concepts from this module to explain why flying bees buzz.
3. If the handle of a tuning fork were to be handled firmly against a table, would the sound from the tuning fork change? If so, what would change?
4. The strings of a harp have different lengths in order to produce different notes. However, given that the strings in a guitar have all the same length, how are the different notes produced?

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