# moment

1. ### Help with moment of inertia questions please

I would like some help with these two questions about moment of inertia please. -First question: https://gyazo.com/eb3f9ef4cc667878c2534fa1624fd00c -Second question: https://gyazo.com/67f974894ab9eccc8c33af724e4192ac For the first question, I have no idea what should I do to start the...
2. ### forces and moment

Hello guys i am trying to solve question A.I just need some help with the few Forces F2 and f3 when only F is applied,i think following forces would act at A Bending at A= F*b torsion=F*a Could you guy help me When: scenario 1: only f2 is acting scenario 2: only f3 is acting
3. ### moment of inertia problem

For the system shown in the figure below, m1 = 7.0 kg, m2 = 2.0 kg, θ = 31°, and the radius and mass of the pulley are 0.10 m and 0.10 kg, respectively. https://imgur.com/a/VYiRKTo (a) What is the acceleration of the masses? (Neglect friction and the string's mass.) Known Formulas: Torque=...
4. ### Inertial "moment" of a solid given an inertia tensor

Hi all, I am programming some software computing inertial forces of some moving structure. So far, the structure have been represented as a cloud of mass points. For each mass point, inertial forces are computed using some formulas like in this article...
5. ### Calculate earths mass and moment of inertia

Hi again everyone, I have a problem (in two parts) where I believe I am tackling the solution with the correct methodology but somewhere along the line I must be going wrong because cannot match my answers to the ones in the book, in fact I am way out (by a factor of 10 to the power 11 or 12...
6. ### Moment of inertia generic calculation

Hi everybody, I am afraid I have come across another Moment of Inertia problem where I cannot see how to proceed to find the solution. It basically gives a cylinder, with generic length, radius and mass of values L, R and M and the fact that density of the cylinder varies linearly with the...
7. ### Moment of inertia of a compound body problem

Hi everyone, I wonder if anyone can help me with a problem which has had me stuck for some time. The problem is as follows - PROBLEM A thin, flat, uniform disk has mass 'M' and radius 'R'. A circular hole of radius 'R/4' centred at the point 'R/2' from the disk's centre is then punched...
8. ### D'Alembert and moment inertia of wheel

Yet another D'Alembert problem. This time a wheel (pulley?) with only one mass but this time I have to account for the moment of inertia. When I tried to frame it mathematically I wrote it down as (F_{applied}-F_{inertial}) \delta s = 0 I ended up with the following. F_{applied} = mg...
9. ### Moment Questions

This question is according to the moment. A. Think about the door. When I add a force of 10N which has perpendicular distance of 5m from the hinge, it has 10*5=50Nm moment. The force is acting by the place where I added 10N. B. When I add a force of 10N which has perpendicular distance of...
10. ### Moment of inertia of a human body

Hi everyone, I have come across a problem and I just don't know how to start to tackle it. The problem is as follows :- Estimate your own moment of inertia about a vertical axis through the centre of the top of your head when you are standing up straight with your arms outstretched. Make...
11. ### Moment of inertia for a slender rod of varying mass

Hi, I have come across a problem where I eventually got the answers to two parts of the problem, but only after I had attempted each part first and got it wrong then, for each part sort of 'reverse-engineered' the solution from knowing what the correct solution was and although I came away with...
12. ### Moment of inertia of a compound body

Good morning all, I am having trouble with a problem to calculate the Moment of Inertia of a body made up of two distinct but linked extended bodies. I have used the generic equations for these two bodies and then added the values to obtain what I thought was the solution but my answer does not...
13. ### Moment of Inertia Problem

Hi, I have come across a problem dealing with calculation of the Moment of Inertia of an extended body and I just don't understand why the answer is what it is. I understand the basic concept of Moment of Inertia in general, and am aware of how you calculate this concept for a variety of...
14. ### Moment diagram

for the moment diagram, why the 400Nm straight line is drawn from the point of moment to A only? why shouldnt the 400Nm straight line is drawn from the point of moment to B only?
15. ### Magnetic moment of bar magnet, estimate

The treatment for the magnetic moment of a bar magnet has been exhibited in most general physics and EM texts. How can the magnetic moment of a bar magnet be reasonably estimated from the total magnetic flux passing through the magnetized material in the plane that is perpendicular to the...
16. ### Inertial moment variation

Hi, I would like to ask a question, if I may: if I have a body with a calculated Inertial moment and angualr momentum at time t0, that in a space of time delta t changes, there's a variation in its kinetic energy, right? How can I calculate the released temperature in that elapsed time? Is...
17. ### restoring moment

why the restoring moment in diagram 3-48 must be in anti-clockwise direction ? cant be in clockwise direction ? pls refer to the last photo ( i sketched it) , if the B' is located on the left of the G , the restoring moment is clockwise, right ?
18. ### Finding dipole moment vector / Electric Field problem

Numbers 3 and 4 from the included image are giving me some issues. Help?
19. ### constraint of moment about an axis

why there is no constraint of plate about a axis ? for moment about z -axis , i can have -2Bx +3By = 0 , where By and Bx = 0 which is shown in the top part of solution....
20. ### Help Deriving Moment of Inertia of Solid Sphere (Where did i go wrong?)

I am attempting to derive the moment of inertia for a solid sphere by summing an infinate amount of thin spherical shells instead of disks. Sphere has radius R Shells have radius r and thickness dr I=sum(mr^2) = integral(r^2dm). to sub out dm in terms of dr, p=m/v so pdv=dm. dv of a shell...