All Questions
Tagged with relative-motion vectors
47
questions
-1
votes
2
answers
91
views
Not able to understand relative velocity in 2dimension?
I have a body A = 4j and B = -3i
Their relative velocity = -3i-4j.
But the position is somewhere they both don’t even meet.
It should be from B to A but it form C to A or B.Not able to understand what ...
user280997
-2
votes
1
answer
69
views
Problem regarding relative velocity [closed]
Train A moves north with speed 54km/h. What is the velocity of a monkey running on roof of a train A against its motion (with velocity of 18km/h with respect to A)as observed by a man standing on ...
- 47
1
vote
0
answers
80
views
Vector addition of drone affected by wind
I've been struggling with this calculation for around a week and am starting to question whether or not it's even possible.
What I want to do is find the bearing and speed a drone will need to fly at ...
- 11
0
votes
3
answers
103
views
A textbook problem on vectors [closed]
I am stuck on a textbook problem on vectors (a new topic for me). The problem given in my book says:
A man can swim with a speed of 4 km/h in still water. How long does he take to cross a river 1 ...
user236322
-6
votes
1
answer
113
views
An Evil Vector Problem! [closed]
A person is walking on straight road starting with a velocity $v$, the direction of of air ,observed by him makes an angle $\alpha$ with his is direction of motion. Now during the race, he finds ...
- 115
1
vote
1
answer
887
views
Time when two particles will meet [closed]
Particle P moves with constant speed of 13m/s always aiming at O . As P starts moving , O moves with constant velocity of 5m/s towards positive y-axis. Time taken by particle P to catch O will be?
I ...
- 29
1
vote
1
answer
100
views
Signs in relative vector addition
So I know the formula for relative vector addition is
$$w = \frac{v-u}{1-\frac{uv}{c^2}}.$$
How do I chose when to use this formula or its inverse transformation for solving vector addition problems ...
- 33
-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 ...
- 203
0
votes
1
answer
605
views
Is this Question correct? Newtonian Motion - Relative Motion of Rain
There is a question in a textbook which states:
"A cyclist is riding north at 12km/h when it starts to rain. The rain appears to be falling towards her at an angle of 10 degrees relative to the ...
- 57
1
vote
3
answers
6k
views
Relative motion involving angle
Suppose I am going in a direction with a velocity $v_1$ and my friend is going in a direction which makes an angle of $A$ with my direction with a velocity of $v_2$.
Then what will be my relative ...
- 1,400
0
votes
3
answers
76
views
Reference Frames
I observe two cars approaching each other from opposite directions and measure as 40 mph and 30 mph, respectively. How fast is the 40 mph car moving according to the driver in the 30 mph car? ...
- 19
1
vote
1
answer
2k
views
What is the speed of a swimmer in a river when he wants to travel the minimum distance?
The speed of the swimmer in still water is $v$ and that of the river is $u$ ($v>u$). He should travel at an angle $x$ with respect to the direction perpendicular to the river's flow, towards the ...
-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 ?
- 103
0
votes
3
answers
477
views
Kinematics: relative velocity [closed]
The question goes like this:
An aircraft, with velocity 580 km/h, is supposed to follow a straight path in the direction 38,0° in the northeast (measured from the east). The aircraft experiences a ...
- 118
0
votes
2
answers
126
views
If a boat can travel at 10 mph in a river with no current, will it always be moving 10 mph compared to the water at full speed, regardless of current?
I must be confused, because it seems to me that the boat would always be traveling 10 mph in relation to the water regardless of the water's velocity, but the answer key for my assignment states the ...
- 127