All Questions
14
questions
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?
14
votes
0
answers
679
views
Motion of Points around a Triangle [closed]
I came across this problem in the book "Problems in General Physics by IE Irodov"-
Three points are located at the vertices of an equilateral triangle whose side equals s. They all start ...
- 149
-1
votes
2
answers
91
views
Velocity Question from grandparent
My Grandparent asked me this question a few years ago, and I am getting around to giving him an answer, but I don't know the answer. Can anyone help?
"A pickup truck is speeding along a highway ...
- 21
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
1
answer
123
views
Why is heat energy dissipation in two intervals frame dependent?
The question asks for heat produced in the given specific conditions. It seems like an application of the work-energy theorem with friction doing work on the block and dissipating the heat in the ...
1
vote
1
answer
67
views
A non-intuitive kinematics problem? [closed]
Ann is sitting on the edge of a carousel that has a radius of $6\ \mathrm{m}$ and is rotating steadily. Bob is standing still on the ground at a point that is $12\ \mathrm{m}$ from the centre of the ...
- 178
1
vote
1
answer
645
views
What will be the total work done by friction on the system (man+boat)? [closed]
As I am seeing this, the man and boat will have different displacement from ground frame, so there should be a net work done by friction . The books says, total work done by friction is zero when ...
- 35
0
votes
1
answer
73
views
Free fall time after being accelerated [closed]
An elevator car whose floor-to-ceiling distance is equal to $2.7m$ starts ascending with constant acceleration $1.2 m/s^2$; $2.0 s$ after the start a bolt begins falling from the ceiling of the car. ...
- 558
0
votes
2
answers
156
views
Doubt on how I have applied Newton's law of motion
I have found several questions where the pseudo force is applied in the wrong direction, and I am confused whether I m correct or not. The question is something like this.
Thin threads are tightly ...
user203191
2
votes
1
answer
841
views
Relative motion - Cylinders rolling between two identical planks
Today i ran onto this simple problem, which seemed to be interesting to me. Given the illustration bellow, the problem is states as:
Two identical cylinders roll in between two identical planks. If ...
user16688
-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-...
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 ...
- 135
1
vote
2
answers
406
views
What is the relative acceleration of a projectile fired at in a low gravity vacuum?
This question is to end an old argument.
Given a (space) vehicle with an acceleration of X, and projectile with an acceleration of 2X (rocket, not bullet), what would the relative acceleration of the ...
- 113
1
vote
1
answer
5k
views
Calculating velocities using Reference frames
Suppose an object A is traveling at a velocity of 100 m/s, and another object B is traveling at 105 m/s. With both the objects traveling through the same direction, taking A as a reference frame, the ...
- 9,108