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12 questions with no upvoted or accepted answers
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 $t = 45$ ...
Divya Prakash Sinha's user avatar
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 ...
Samyak Sambuddha's user avatar
0 votes
0 answers
3k views

On a rainy day, a man is running on a hilly terrain in such a way that he is always finding the rain drops hitting him vertically

It is assumed that rainfall is uniform in the whole terrain from O to E(figure attached) When the man was at rest on stretch OA, he found the rainfall at an angle of $30^o $ with the vertical. What ...
Prajwal Tiwari's user avatar
0 votes
1 answer
38 views

Direction of $V_RM$ confusion

So ,please read both the questions . They have similar originate questions that I am facing difficult in. Let us say rain is falling downwards with v = -5j and a man is moving with a velocity of 2i in ...
Srijan's user avatar
  • 725
0 votes
0 answers
413 views

Question based on relative motion in two dimension

I came across this problem in my work book. A hunter is riding on an elephant of height $4$ $ m$ moving in straight line with uniform speed of $2$ $ m/s$. A deer running with a speed $V$ at a ...
Fasal123's user avatar
  • 113
0 votes
0 answers
1k views

Relativity of simultaneity - under what conditions would two events happen simultaneously for frames $S$ and $S'$ when $S'$ is moving relative to $S$?

I feel like I have a fundamental confusion with the following exercise: I'm confident with my answer in (a), which is that $B$ must be within the light cone of $A$, or that $B$ is causally connected ...
sangstar's user avatar
  • 3,200
0 votes
2 answers
118 views

Changing mass and relative motion

Sand is pouring vertically on a cart at J [kg/sec], from negligable hight. The cart is standing on top of a frictionless surface. What force F do we have to apply to the cart for it to move at a ...
Maor's user avatar
  • 107
0 votes
0 answers
831 views

Simple Rotating frame of reference

I have a car moving in straight line with certain time-varying acceleration and there is another car moving in a curvilinear way along some curved path with some time-varying acceleration. The ...
archangel89's user avatar
-1 votes
1 answer
52 views

Why is direction of train like this for car?

This is an image of a train and a car. T is the train moving towards - $x$ axis and C is the car moving towards $+ y$axis. So, my teacher made a resultant velocity with $-5\hat i$ and $-20\hat j$. ...
Srijan's user avatar
  • 725
-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 ...
Lauren Sin's user avatar
-1 votes
2 answers
58 views

Velocity as viewed from space

I got a problem which asks if the speed of a car in Oslo is 50km/hr what will be its speed when viewed from space. I have the relation between the velocities as observed from inertial and non-...
Arijeet Dutta's user avatar
-1 votes
2 answers
40 views

Is this correct regarding velocity of train?

So many yellow T drawn are just different position of train at different instants.The person is standing still at all those instants at one place. If a train is moving at 5m/s. Then for me , can we ...
Srijan's user avatar
  • 725