Help Solve Physics Problem Now: String Unwound from Wheel

  • Thread starter Thread starter joecocobo
  • Start date Start date
  • Tags Tags
    Physics
Click For Summary

Homework Help Overview

The problem involves a string wound around a wheel with a diameter of 20 cm, which is being unwound at a rate of 75 cm/s. The original poster seeks to determine the number of revolutions the wheel makes when 9.0 m of string is unwound and the time taken for this process.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss separating the problem into two components: calculating the number of revolutions based on the wheel's circumference and determining the time taken to unwind the string at a given speed. Questions arise regarding the relationship between the diameter and circumference of the wheel, as well as how to calculate time using distance and velocity.

Discussion Status

The discussion is ongoing, with some participants offering guidance on how to approach the problem by breaking it down into manageable parts. There is no explicit consensus yet, as the original poster has not provided an attempt at a solution.

Contextual Notes

The original poster expresses uncertainty about where to begin and indicates a desire for detailed explanations to facilitate learning. There is an emphasis on following the forum's posting template for assistance.

joecocobo
Messages
2
Reaction score
0
Need Help Now

A string wound on the rim of a wheel 20 cm in diameter is pulled out at a rate of 75 cm/s. Through how many revolutions will the wheel have turned by the time that 9.0m of string has been unwound? Also how long did it take?

I really need help with this. If you post, please show all work so I can learn how to do this type of problem.
 
Physics news on Phys.org


joecocobo, welcome to PF.

You'll have to follow the posting template and show your attempt at working on the problem before help/hints/guidance can be offered.
 

Homework Statement


A string wound on the rim of a wheel 20 cm in diameter is pulled out at a rate of 75 cm/s. Through how many revolutions will the wheel have turned by the time that 9.0m of string has been unwound? Also how long did it take?


Homework Equations


I don't know any equations to use


The Attempt at a Solution


I honestly don't know where to start, to even make an attempt
 
Last edited by a moderator:
You may be overthinking it. For starters, separate the question into its two components. They are not related.1] A 9.0m string is wound on the rim of a wheel 20 cm in diameter. How many times is the string wrapped around the wheel?
Do you know the relationship between the diameter of a circle and its circumference?

2] How long will a point on the string take, moving at 75cm/s, to travel 9.0m?
Do you know how to calculate time, given a distance and a velocity?
 
Last edited:

Similar threads

A cart with two cylindrical wheels connected by a rod
  • · Replies 8 ·
Replies
8
Views
2K
Long string wrapped around cylinder. Find cylinders angular speed?
  • · Replies 4 ·
Replies
4
Views
9K
Help please with power calculations to turn a large flywheel at 1rpm
  • · Replies 8 ·
Replies
8
Views
2K
Travel time of a particle suspended from an elastic string
  • · Replies 6 ·
Replies
6
Views
2K
Tangental Velocity and Bicycle Wheel Radii
  • · Replies 2 ·
Replies
2
Views
6K
Angular Momentum Question concerning a Merry Go Round
  • · Replies 44 ·
2
Replies
44
Views
7K
Revolutions and radius of wheel
  • · Replies 1 ·
Replies
1
Views
6K
Problem of torque transmission and determining how to achieve a velocity
  • · Replies 12 ·
Replies
12
Views
3K
Torque, Angular Displacement, Work
  • · Replies 6 ·
Replies
6
Views
5K
Solving a Physics Problem with Mathematica: Get Help Now!
  • · Replies 1 ·
Replies
1
Views
1K