All Questions
10
questions
0
votes
1
answer
121
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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 ...
0
votes
2
answers
286
views
Change in Kinetic Energy in two different reference frames (one of them non-inertial) [duplicate]
Let's say an object of mass 10 kg is fired from a cart of mass 90 kg. The object and the cart, of total mass 100 kg were initially moving together with a speed of 10 m/s. Then, the object is fired by ...
- 95
1
vote
3
answers
771
views
Ship' smoke velocity?
I am studying mechanics from MIT 2.003. In HW problem "which I solved wrong" they stated that:
An important fact is that the smoke travels with the wind at the velocity of the wind
In this problem ...
- 201
0
votes
1
answer
88
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Kinetic energy in different frames [duplicate]
I have an electric bike moved by a battery. I am at a train station with two friends. A flat train car platform passes by at $1 m/s$. The friend #1 jumps on it while the friend #2 remains at the ...
- 12.7k
0
votes
3
answers
76
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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
657
views
If kinetic energy depends on your reference frame then which frames kinetic energy is dissapated during a collision to cause damage etc?
Say you have an object such as a car with mass 4,000kg moving at a speed of 20m/s relative to the ground in a straight line towards another object with, say, 2,000kg which is stationary on the ground ...
- 199
2
votes
4
answers
986
views
Ball dropped from train [closed]
A ball is dropped of a train traveling with high velocity, to a man standing near the track, the ball........
A) falls down vertically
B) moves horizontally
C) follows an elliptical path
D) ...
0
votes
0
answers
831
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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 ...
- 135
0
votes
2
answers
127
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Does it take less time to drop a ball than fire one horizontally (with $90^{\circ}$) [closed]
So I was arguing about this with my friend. If we take two balls and drop one from a certain height H and then fire another one with horizontally with some initial speed from the same height H, which ...
- 505
2
votes
1
answer
206
views
How can we find velocity, acceleration etc, of a revolving particle with respect to an observer inside the circle (not at center)? [closed]
A particle is revolving in horizontal a circle of radius $R$ with constant speed of $|\vec{v}|$ and constant angular velocity $\omega$. There is another observer standing inside the circle, at a ...
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