With what speed does the object get nearer to the reflection

AI Thread Summary
An object approaching a mirror at speed v gets closer to its reflection at double that speed, 2v. This is because the distance to the mirror is equal to the distance to the reflection, effectively doubling the length traveled. The time taken to reach both the mirror and the reflection is the same. Clarifying the definitions of t1 and t2 as the times taken to reach the mirror and reflection respectively supports this conclusion. Overall, the reasoning is validated with the correct understanding of the time and distance relationship.
annalian
Messages
56
Reaction score
1

Homework Statement


An object gets closer to the plain mirror with a speed v. With which speed does it get closer to the reflection?

Homework Equations


l=v*t

The Attempt at a Solution


As l (length of road) is twice as big l2=2l1, but the time is equal t1=t2, then velocity should be two times bigger. Am I right?
 
Physics news on Phys.org
annalian said:
As l (length of road) is twice as big l2=2l1, but the time is equal t1=t2, then velocity should be two times bigger. Am I right?

Your answer is correct but I'm not sure I understand your reasoning.
 
CWatters said:
Your answer is correct but I'm not sure I understand your reasoning.
Could you give me a hint about the correct one?
 
annalian said:
Could you give me a hint about the correct one?
You need to explain how you are defining t1 and t2. These are the times taken to do what? (I believe your reasoning is fine if you fill that in appropriately.)
 
haruspex said:
You need to explain how you are defining t1 and t2. These are the times taken to do what? (I believe your reasoning is fine if you fill that in appropriately.)
t1 is the time taken to meet the mirror, t2 i the time taken to meet the reflection. As the mirror and reflection are met in the same time t1=t2
 
annalian said:
t1 is the time taken to meet the mirror, t2 i the time taken to meet the reflection. As the mirror and reflection are met in the same time t1=t2
With that preamble, your answer looks good to me.
 
  • Like
Likes annalian

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Find the distance from the mirrors for 4 reflections
Replies
3
Views
1K
What is the speed of the 5th image in optics with multiple mirrors?
Replies
6
Views
1K
What Is the Angle of Reflection in a Plane Mirror?
Replies
11
Views
2K
Placing object between 2 spherical mirrors
Replies
3
Views
2K
Why Do Objects in Convex Car Mirrors Appear Closer Than They Are?
Replies
5
Views
2K
Find the height of a lamp based on the velocities of projectiles
Replies
40
Views
2K
How Does Reflecting a Particle Stream Affect the Force on a Surface?
Replies
8
Views
3K
Velocity of image in plane mirror
Replies
5
Views
2K
Mirror 4-Momentum: Find Frequency Change on Reflection
Replies
4
Views
2K
Refraction through a glass slab + reflection off a concave mirror
Replies
19
Views
8K

Hot Threads

Recent Insights

Back
Top