Center of gravity Definition and 172 Threads

I am trying to understand the math for this problem. My instructor did a poor job of explaining it in class. He took a "skyhook" or belt hanger ( looks like a music note make out of wood)" put a stiff belt on it and balanced it on the edge of a table. He exaplained that the center of gravity...

A 10.7kg cylinder rolls without slipping on a rough surface. At the instant when its center of gravity has a speed of 11.8 m/s, a) Find the translational kinetic energy of its center of gravity. b) Find the rotational kinetic energy about its center of mass at that time. c) What is...

The homoegeneous wire ABCD is bent as shown and is supported by a pin at B. Knowing that l=8, determine the angle theta for which portion BC of the wire is horizontal. Below is the free body diagram with the forces exerted by the pin indicated by the two arrows on the wire. How do I approach...

[SOLVED] center of gravity .. hi. i was wondering , is the center of gravity of an object always located in the interior of the object? i think its not because for example, kite has a center of gravity outside its interior of itself right? please correct me and explain to me why this...

Two people carry a heavy electric motor by placing it on a light board of length 2.50 m. One person lifts at one end with a force of 400 N, and the other lifts the opposite end with a force of 560 N. a) What is the weight of the motor? b) Where along the board is its center of gravity...

A door of width 1.10 m and height 1.93 m weighs 290 N and is supported by two hinges, one a distance 0.500 m from the top and the other a distance 0.500 m from the bottom. Each hinge supports half the total weight of the door. Assuming that the door's center of gravity is at its center, find...

Hi: I have a very big concern about my mechanics homework because a problem says: "Find a formula that gives the position of the center of gravity and make sure that in the limiting case of a uniform gravitational field your formula predicts that both center of gravity and center of mass...

If you put a uniform block at the edge of a table, the center of the block must be over the table for the block not to fall off. If you stack two identical blocks at the table edge, the center of the top block must be over the bottom block, and the center of gravity of the two blocks...

hey guys, i need some help. we are taking the center of gravity in my physics class, and its all x average = (w1x1+w2x2)divided by negative w... etc... and i really don't get much of it. can anyone recomned a site that might help me?[FONT =Book Antiqua]xxx[/FONT][COLOR =Indigo]xxx[/COLOR]

Hello, i am on a robotics team and working on creating a robot to compete at www.usfirst.org competitons. I am having a hard time constructing a formula that will find the ideal center of gravity for our robot arm attachment. here are some specs: length (at the base) 38 in , width 28 in (at the...

hi, here's my question... A pizza has a center of gravity at C, in the middle of the pizza radius = R A smaller circle of pizza is cut from the pizza of radius R/2 at the left side of the pizza so that one the diameter of the hole where the smaller piece was stretches from the edge of the...

Here's the question: "Two equal masses m are separated by a distance a. Find the center of gravity of the two masses relative to a point P on the perpendicular bisector of the line joining them a distance y from the midpoint between them." (perpendicular bisector definition) I never heard...

Hi, I'm kind of stuck on this problem and maybe you guys can help me. If so I greatly apreciate it. An 850-N painter stands 1.20m from one end of a 3.00m scaffold supported at each end by a stepladder. The scaffold weighs 250-N and there is 40.0-N can of paint opposite the painter. How much...

Hey guys, I was assigned a bunch of questions by my teacher and I'm having trouble with these two: A person is sitting with one leg outstretched, so that it makes an angle of 30 degrees with the horizontal, as the drawing indicates. The weight of the leg below the knee is 44.5 N with the...

I am having increasing difficulty with the above types of problems. Does anyone know of an easier way to understand the two types of problems?

This is a question I need to do, I'm just going to put an example on what the question is like. In case a teacher of mine comes on here, I know I'm not "cheating". Here is the image: l\ lz.\.../l l...\..../xl l...\______/...l l...l____q_l...l l.....l *Ignore dots. z=56.2...

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...

hey everybody: here is my problem A uniform, aluminum beam 9.00 m long, weighting 300 N, rests symmetrically on two supports 5.00 m apart. A boy weighing 600 N starts at point A and walks toward the right. How far beyond point B can the boy walk before the beam tips? it will be...

hey all: A ball with radius 0.081 m and mass 1.03kg is attached by a rod of length 4.5 m to a second ball with radius 0.1m and mass 1.94 kg . Suppose the rod is uniform with mass 1.53 kg . Where is the system's center of gravity? Express answer as a distance measured from the center of...

An automobile has 58% of its weight on the front wheels. The front and back wheels are separated by 2 m. Where is the center of gravity located with respect to the front wheels? Need help setting up the problem. Thanks

A carpenter's square has the shape of an L, as in Figure P12.7 (d1 = 16.0 cm, d2 = 4.00 cm, d3 = 4.00 cm, d4 = 11.0 cm). Locate its center of gravity. (Hint: Take (x,y) = (0,0) at the intersection of d1and d4) (I tried to attach the picture but I couldn't get it to work, so just know the width...

Two spheres of radius R rest on a horizontal table with their centers a distance 4R apart. One sphere has twice the weight of the other sphere. Where is the center of gravity of this system? Please help me solve this problem.