Center of mass Definition and 915 Threads

Hi, I have another question on the center of mass this time. I read a problem in my university physics book by sears and zemanski which had a problem in which two guys want a mug of beer on an ice pond. There is a rope between them and each man tugs on the rope pulling themselves towards each...

Center of gravity (it's not center of mass!) Hi, I'm a very desperate person right now. For two days (I'm totally dumb) I've been trying to calculate the center of gravity of two rigid bodys... Look, it's not the center of mass (I'm not that dumb!). OK, here's the problem...(at least one of...

I am working on a rocket and need to find the center of mass of a hollow nose cone. Any help would be appreciated.

Hi, here is the problem: Imagine three spherical masses all fixed on the x-axis: mass 5M at the origin, mass 2M at x =+12.0 units, and mass M at x = -8.0 units, all connected by a rigid rod whose mass can be ignored. At what position along the x-axis is the center of mass of the system...

I forget how these two relate both conceptually and mathematically...any help?

Inertia and Center of Mass?? I'm a bit confused about finding the moments of Inertia for objects, I know I=Icm+MD^2 but what exactly is D, is it the distance from the Center of Mass to the pivot point, can someone please explain this to me? :confused:

Can someone please help me with this problem, a hint, anything something? A girl throws a stick with a length of 0:25 m and a mass of 0.53 kg into the air in such a way that the center of mass rises vertically. At the moment it leaves her hand, the stick is horizontal and the speed of the...

here's the question: A uniform rod of length 1.15 m is attached to a frictionless pivot at one end. It is released from rest from an angle of 27 degrees above the horizontal. Find the magnitude of the initial acceleration of the rod's center of mass. So far I've only been able to figure...

Question: Find the solid angle subtended at the origin by a thin circular disk of radius a, whose cente is a distance b from the origin and where the normal to the disk is parallel. Do I have to find the center of mass to solve this question?

In a system of several masses the center of force has same position with the center of mass in the geometrical space; Yes or No? Please explain why!

This is attempt to address Arcon's page on center of mass He says: \vec{R}=\frac{\sum m_i\vec{r_i}}{M} R is radius vector of the center; ri are radius vectors of mi; M is sum of all mi; It can be generalized to vector mass too...

Show that the center of mass of a uniform semicircular disk of radius R is at a point (4/(3*Pi))R from the center of the circle. well I know I am suppose to find this by integration. By this equation M\vec{r_{cm}}=\int\vec{rdm} But, I am not sure how to find dm in this case... do I...

A circular hole of diameter 11.1 cm is cut out of a uniform square of sheet metal having sides 22.2 cm, as in the figure. What is the distance between the center of mass and the center of the sqaure? i need some serious help with cm, i don't get this at all.

A 4.01g particle is moving at 1.36 m/s toward a stationary 9.43g particle. With what speed does the heavier particle approach the center of mass of the two partciles? i don't get how cm relates to finding speed The mass of a star like our sun is 347000 Earth masses, and the mean distance...

Imagine a square with side length "a". Now, divide the square into 4 equal squares with side length "a/2". In the top righthand corner of the large square, a circle with radius "a/4" is cut out, which also removes the top corner piece. What is the new center of mass? (The origin is at the center...