All Questions
Tagged with relative-motion homework-and-exercises
128
questions
0
votes
0
answers
29
views
Question regarding friction acting on a disk on a conveyor belt [closed]
I have the following problem on which i am working
A horizontal conveyor belt is running at a constant speed of $v_b = 3.0\hspace{1mm}m/s$.
A small disc enter the belt moving horizontally with a ...
- 73.7k
0
votes
1
answer
35
views
How to calculate the relative speed when three bodies are involved? [closed]
Two trains A and B start from a station and move in parallel tracks with velocities 40 kmph and 60 kmph respectively. A man sitting in train A. watches a lady who walks inside the train B at a speed ...
3
votes
2
answers
1k
views
Upstream and downstream problem using relative velocity
On a river coast, there is a port; when a barge passed the port, a motor boat departed from the port to a village at the distance $S_1 = 15$ km downstream. It reached its destination after $t = 45$ ...
CommunityBot
- 1
0
votes
1
answer
78
views
Calculating relative velocity: What am I doing wrong? [closed]
There are two objects A and B. Points P1, P2, P3 are in the same line, and P2 is exactly at the middle of P1 and P3
Suppose B is moving at constant velocity along the line P1 to P3. Thus, time taken ...
- 141
-1
votes
1
answer
168
views
Apparent velocity of winds
If I run north at 10j m/s and the wind is also blowing north at 2j m/s, then do I feel a wind of 8m/s in my face if the relative velocity of the wind to me is -8j m/s ?
- 530
-1
votes
2
answers
4k
views
What does speed of an object relative to water mean?
A swimmer swims with the velocity 1.25 m/s "relative to water". He has to swim across the river which is 150 meters wide. If his direction of velocity is perpendicular to the stream, he is taken away ...
1
vote
1
answer
77
views
Wording of Relative Velocity problems [closed]
I've been doing some relative velocity problems. The three main types I do are to do with cars, boats/rivers and planes/crosswind.
I'm fine with cars as the wording is pretty straightforward - it is ...
- 97.9k
0
votes
1
answer
121
views
Velocity of Separation and Relative Velocity
I have some problems in understanding a concept, which has been used in the problem in the picture:
I don't understand what are we actually using to solve this question. Are we using relative ...
- 207k
1
vote
1
answer
60
views
Simple classical mechanics problem to compute minimum distance attained between two ships moving with constant velocity
I have been reading the book "A Course in Classical Physics 1 - Mechanics" by Alessandro Bettini. I have reached a problem in the first chapter that I am having trouble with.
The problem ...
- 13.8k
0
votes
1
answer
44
views
Is the relative velocity between these two particles increasing or decreasing? [closed]
The displacement time equations of two particles are:
$$s_1 = 2t-4t^2$$
$$s_2 = -2t + 4t^2$$
By differentiating we can find $v_1,v_2$. Subtracting them gives: $v_1-v_2 = 4-16t$
Clearly, this ...
- 41.1k
1
vote
1
answer
3k
views
Finding resultant and direction of resultant
In this question-
A motorboat is racing towards the north at 25km/h and the water current in that region is 10km/hr in the direction of 60 degrees east of the south. Find the resultant velocity of ...
- 1
3
votes
0
answers
119
views
Wind and sound waves [closed]
The official answer is C.
Why not A? If I add a horizontal component of velocity towards left, why would the path become curved?
CommunityBot
- 1
0
votes
1
answer
95
views
For an airplane moving north from some latitude (say $30^{\circ}N$), why does rotation of the Earth cause an increase in apparent drag?
I'm not able to understand the answer to this example:
Example 10 from the Curtis Orbital Mechanics text book :
An airplane of mass $70 000\ \mathrm{ kg}$ is traveling due north at latitude $30^\circ$...
- 207k
0
votes
1
answer
111
views
Distance between two airplanes [closed]
I need help with a vector problem where my solution is different from that of my teacher. The translation of the problem reads as follows:
An air traffic controller observes two aircraft on his radar ...
- 207k
6
votes
3
answers
516
views
Interesting answer as a range of tension in pulley-block-plane system
I want some intuitive understanding on why there will be a range in tension in the below question. (On solving we will get that the system is at rest ($a=0$) and since its starts from rest the blocks ...
- 3,778