All Questions
23
questions
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 ...
- 95
0
votes
2
answers
91
views
Why does these two masses not have same acceleration? [closed]
Assumptions: No friction , $m_2$=5kg and $z_1$=2kg. $z_2$ is fixed at its place.
Here, there is a mass of $5kg$ on a movable wedge of mass $2kg$. So, my question is that can we say that acceleration ...
- 33
-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 ...
- 725
-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
0
votes
1
answer
489
views
Forces acting on a book on a moving table [closed]
I’m studying for an upcoming physics exam and one of the sample questions essentially boils down to this: a book (not clamped on) is on a table that is moving to the left. Is there a force of static ...
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
0
votes
1
answer
56
views
Rotationated inertial frames and Galileo Relativity
Consider then a inertial frame $S$ and another one, $S'$.
The inertial frame $S'$ is at uniform motion with respect to $S$.
Both inertial frames are the Euclidian vector spaces $\mathbb{E}^3$ equipped ...
- 3,085
0
votes
2
answers
1k
views
Relative motion problem [closed]
A man travelling in a car with a maximum constant speed of 20m/s watches the friend start off at a distance 100m ahead on a motorcycle with constant acceleration a. The maximum value of a for which ...
- 19
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 ...
- 107
4
votes
1
answer
1k
views
Rotating table with a groove having a ball within
A circular table of radius R is rotating with an angular speed Ω. It contains a groove of lenth L starting from the center of the the table and running along the radius vector of the table. A ball of ...
- 395
-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-...
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) ...
4
votes
2
answers
1k
views
Find the relation between length of pulley and strings [closed]
A pulley is pulled with external force $F$. $x$ and $y$ denote the displacement of two ends of strings of the pulley and $z$ is the displacement of the pulley.
Prove That $$z = \dfrac{x+y}{2}$$...
- 252