Question on circular motion, finding out the angular displacement in a clock.

Click For Summary

Homework Help Overview

The problem involves calculating the angular displacement of the minute and hour hands of a clock at 3:30, specifically from the 12:00 position. The original poster expresses confusion regarding the correct angular displacement for the hour hand.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the angular displacement but questions the correctness of their answer for the hour hand. Some participants raise the question of whether the hour hand is positioned directly at 3 or between 3 and 4, leading to a reconsideration of the original poster's assumptions.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the hour hand's position. There is recognition of the complexity of the question, and some guidance has been offered regarding the hour hand's actual position at 3:30.

Contextual Notes

The original poster's calculations are based on a misunderstanding of the hour hand's position, which is critical to determining the correct angular displacement. The discussion highlights the importance of precise definitions in the context of the problem.

mutineer123
Messages
93
Reaction score
0

Homework Statement


A clock is showing 3.30. Calculate the angular displacement in degrees from the 12.00 position of the clock to:
i the minute hand
ii the hour hand

I got my minute answer as 180 degree, which is right. But my second answer was 90 degrees, which apparently is wrong! the answer theyr giving is 105 degrees! how come? even just looking at the hour hand, we can see that the angular displacement should be 90 degrees! they did something like 3.5/12 X 360 degrees.


Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
When the clock reads 3:30, is the hour hand pointing directly at 3 or is it somewhere between 3 and 4?
 
Jimmy said:
When the clock reads 3:30, is the hour hand pointing directly at 3 or is it somewhere between 3 and 4?

holy crap, u are right. Its btween 3 and 4...I totally overlooked that!
 
It's a bit of a trick question. My first reaction was that the answer is wrong until I thought about it for a few seconds.
 

Similar threads

Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K
Replies
3
Views
1K
  • · Replies 7 ·
Replies
7
Views
13K
  • · Replies 2 ·
Replies
2
Views
1K