All Questions
107 questions
0votes
1answer
44views
Problem regarding torque [closed]
I am unable to find a correct answer to this. X and Y are two forces (as shown in the figure below) 400 cm apart. O is the point midway between X and Y. P is a point along X. Calculate the sum of ...
2votes
0answers
96views
How can the relationship $ r_1 T_1 = r_2 T_2 $ be directly derived for a massless rod from Newton's second law of translational motion?
I am trying to understand the derivation of the torque equation $ \vec{r} \times \vec{F} = I \alpha $ In my book, it is derived easily using Newton's second law for a single point mass $ m $ at a ...
- 163
1vote
0answers
36views
Frictional Torque on a Rotating Triangular Lamina [closed]
I was solving this problem, when i came across the issue i am about to ask here, A uniform right angled triangular lamina is placed on a horizontal floor, which is not friction less. One of the acute ...
- 183
1vote
0answers
51views
Gyroscope Calculations
Above is an illustration of a gyroscope and now according to the right hand rule, I have given the directions of torque. Since it is a spinning wheel I have replaced the Force with the centrepetal ...
0votes
1answer
58views
Can we model the pitch up of an aircraft due to sudden application of brakes while it is rolling down an inclined using angular impulse method? [closed]
Consider an aircraft parked on an inclined plane. Due to a mistake by the pilot the brakes were released, and the wheel chocks were missing. When the plane started to roll down, the pilot applied the ...
1vote
2answers
627views
Axis of rotation of a spool unwinding and falling under gravity
There is a problem that asks for forces that apply torque around the axis of rotation on a spool of string that falls and unwinds under gravity. The spool falls straight down with a vertical string. ...
- 71
2votes
0answers
170views
Tipping a cylinder [closed]
A horizontal force is applied to the top of a cylinder, creating a torque on it trying to tip it over. Now I have wondered to what height should the cylinder be filled with water to render it most ...
- 25
0votes
1answer
32views
Relating Torque conceptually
So hypothetically, you have a disc or ring. And on opposing edges of that disc/ring, there are two thrusters that given a set amount of Newtons of force (say 120 N) both in the counterclockwise ...
1vote
1answer
359views
Why don't Euler's formulas for torque apply to this problem?
In my mechanics class we were assigned problem 9.44 from "Introduction to Classical Mechanics" by David Morin as homework. The problem and figure are below: Two wheels of mass $m$ and ...
0votes
2answers
199views
High school Momentum/Torque problem [closed]
This is embarrassing but I can't seem to solve this problem, even though I know how to resolve forces involved. The weight of the base is 868 N.
- 111
0votes
1answer
64views
How can one calculate the torque around this point? [closed]
I'll link to one of my previous problems, since the setup is very much alike this one for the problem I'll be solving: What happens with the pendulum when we choose this angular velocity for a ...
- 490
0votes
0answers
171views
What happens with the pendulum when we choose this angular velocity for a rotating platform?
The problem is presented below: I've managed to find the angular frequency of the pendulum using torque, and small-angle approximation. Finally, I wanted to check my expression and see whether it's ...
- 490
0votes
1answer
134views
Weight of the hinge
Why is the weight of the hinge itself not considered, or is $H_y$ the sum of the friction force upwards and the weight of the hinge downwards?
5votes
0answers
438views
Maximum length climbed by a squirrel on a vertical rod [closed]
A squirrel of mass $m$ climbs slowly on a thin straight vertical rod of length $L$. Mass of the rod is negligible as compared to that of the squirrel and size of the squirrel is negligible as compared ...
- 135
1vote
1answer
180views
Derivation of precession rate of a wheel gyroscope [closed]
I searched on the web and all I could find is the precession rate of a spinning top. But what I want is the derivation of the precession rate of a wheel hanging from a rope, as shown below: which is ...
- 420
