Drum Definition and 93 Threads

Homework Statement A disk of mass M and radius R unwinds from a tape wrapped around it. The tape passes over a frictionless pulley, and a mass m is suspended from the other end. Assume that the disk drops vertically. a. Relate the accelerations of m and the disk, a and A, respectively to the...

Hi All, I am designing a hollow rotating drum equipment which will be filled with specialized media for wastewater purification. I need help to design the shaft diameter for the entire assembly. The Drum will be hollow with a diameter of 1.77 meter and length of 2.5 filled with some kind of...

I have been trying to understand how the hand-brakes in my car function-and hence I read-up on brake drums and their functioning. Reasoning that one brake shoe(i.e 1 friction shoe out of a total of 2) always gets worn more than the other: if its a leading-trailing shoe type In common-usage...

What I have ? Have a 16’ x 72’ rotating drum There is a solid circular sector inside the drum What I need ? Want to Calculate the torque required to move that solid circular sector from the intial position to the position shown in attached picture (90 Degrees rotation) Data ...

I have a 36" OD aluminum drum within another 48" OD aluminum drum creating 6” channel between the two diameters. The total height of the drum assembly is 16” This design project that I am working on requires me to fill this channel up with 12” of water which equates to about 342.5 lbs of water...

I am going to build a drum out of a propane tank. I think it will be handy to find the resonant frequency of the tank and choose the tuning accordingly so not to pick frequencies that are extremely damped. I have a cavity resonance formula found on hyper physics I am not going to build a...

I came across the following example. I have a mass m' that is suspended from a massless rope which is wound around a drum of mass m. The radius of the drum is R. The drum is fixed on a shaft with bearings of radius r. I am supposed to determine coefficient of friction between the bearings and...

I'm doing some work were its necessary to calculate the force acting on a drum via a wire rope. If I have a known weight acting on the rope already and I want to back calculate the minimum torque necessay for a motor connected to that drum to hold that load, do I add the diameter of the rope to...

Hello , I have to change a car's rear drums to discs . I have the weight at each of the rear wheels . Using DAC I know the max speed and max Decelerations sustained by the car . What are the basic formulae used to calculate the braking forces and the braking distance .

I have a drum of radius of 1.375" with a wall thickness of .3025". It is rotating about its central axis at 2000 rpm. There are 6 holes drilled into the drum radially. I have a pin that slides in and out of those holes in order to release and stop the drum. I am trying to figure out the force of...

Hey, atm I'm working on a physics project for school where we pick an instrument and answer questions about it that we'll have to present in class. I'm going to use a drum pad. The one question I'm stuck on is: I'm not sure if this would be right but please correct me if I'm wrong: For...

Please excuse me if this is not the most appropriate subforum for this question and please move it if necessary. I am trying to make a numerical model with Mathematica to synthesize the sound of a struck drum head (circular membrane). I solve the wave equation for a circular membrane to get a...

Hi everyone-This is my first time posting a homework question. I'm a little stuck. I appreciate any help to clue me in the right direction. Homework Statement If the drum has a surface area of 6.25×10−2 , what total quantity of charge must reside on the surface of the drum? I got...

Hi there, I posted essentially this question a quite awhile ago but the answer wasn't what I needed and then the post got hijacked so I'll try this again worded differently... I need to figure out the torque and hp required to rotate a steel drum, both for acceleration and to maintain its...

I am confused with how to find moment of inertia of composite example. Like a hollow shell having one disc at each end and a shaft in the centre. How to find out Moment of Inertia if Force is applied tangentially on the shell and if force is applied tangentially on the shaft. Should I sum up...

Homework Statement Question: Show that the solutions of the wave equation for a square drum head of side L can be written as: u(x,y,t)=\sum_{k_x , k_y} A_{k_x , k_y} e^{-ik_x x - ik_y y}e^{i\omega t} where: \omega = a \sqrt{{k_x}^2 + {k_y}^2} Where a is the wave-velocity and...

Say I push down on a very large drum head that lies in the z = 0 plane at equilibrium. Suppose there is no friction between my finger and the drum head. Suppose my finger tip pushes the drum head down some distance d. Suppose I accelerate my finger tip to some constant velocity v in the x...

Dear All, I am making a MIDI Drum project. I want to convert the pressure sensed by piezo into pulse width with presetable setting to shift the offset level above which the output pulse will be generated. If you have any other idea to convert pressure to pulse width kindly let me know...

Imagine a drum that is 1m in diameter and .5m long made of 10mm thick steel (369Kg). The drum is stabalized by an adequate gyroscope (50Kg) attached to the outside. Oriantate the drum so that it appears as a circle in front of you. The cylinder portion of this drum is modified so that 980cm...

Homework Statement A cylindrical drum of molasses is 25% full and laying on its side. The dimension sof the drum are 4 ft. height and 1.5 ft. radius. Find the pressure on the circular side (end) of the drum) created by the molasses. Weight density of molasses = 100 lb/ft^3 Homework...

Homework Statement If a spinning drum ride cannot exceed a 10 m radius, and the riders are not to experience an acceleration greater than 2g, what is the maximum speed at which the drum can spin? Homework Equations No Idea The Attempt at a Solution I tried using (theta) = tan-1...

Homework Statement OK so for a project in my physics class I have to make a drum out of homemade things. I understand how to make a drum however my teacher told me that I have make the drum able to play the following notes/frequencies. a. C (261.63 Hz) b. D (293.66 Hz) c. E (329.63 Hz) d...

Homework Statement See Figure. Homework Equations M = Fd The Attempt at a Solution I split all the forces into rectangular components and calculated their perpendicular distance from the point E. M_{R}= 50 = (15.5 * 0.72) + (58 * 0.56) - (63.1 * 0.61) + (90.1 * 1.18) -...

My friend came to me today with an interesting problem. He wants to make some sort of magnet that will make the school band's drumline's snare drums, in essence, levitate. This is for a big school event and he wants to do something special this year. Is it possible to make such a magnet? If so...

The modes of a circular drum head are described by Bessel functions and sines and cosines, but without getting into all that, one can making the following statement: the nodes are circles concentric with the center of the drum, and are also evenly spaced lines that run through the center of the...

Homework Statement A rotating drum is stopped by a brake actuated by a hydraulic cylinder as shown. The moment of inertia for the drum is Io=20 kg-m2. The friction coefficient between the brake shoe and the drum is 0.40. The dimensions are as given in millimeters. Find the force (in N)...

Homework Statement Draw a picture to illustrate the two-dimensional drumhead in the x-y plane. Label the coordinates of the sides of the drumhead. Use this picture to illustrate the "modes" of vibration.Homework Equations \frac{\partial^{2}Z}{\partial x^{2}} + \frac{\partial^{2}Z}{\partial...

Homework Statement A steel drum contains oil with a density of 0.712 and is standing on one of its ends. It has a diameter of 66cm and its height is 1.98m. The plate it is rolled from is 1.2mm thick and has an E=200GPa. It also has an ultimate strength of 510MPa. Homework Equations...

Homework Statement Assignment to create and explain the physics behind a musical instrument, I am doing a drum. I need to find a formula that governs how it produces notes, and can't find one (been searching for atleast an hour now with no luck). Any help would be much appreciated...

I'm trying to make a small Vacuum chamber for some hobby experiments to simulate high altitudes.. I really don't know that much about Vacuum physics so was hoping someone could comment. My idea is to get a vacuum pump and pump out a 55 gallon steel or plastic drum to 1/3 bar. My...

Homework Statement Q A load of mass 8 tonne is to be raised with a uniform acceleration of 1.1 m/s^2 by means of a light cable passing over a hoist drum of 2 m diameter. The drum has a mass of 1 tonne an a radius of gyration of 750 mm. Find the torque required at the drum if friction is...

Hi I have to design a gearbox for a drum, the drum should be brought uniformily to a speed of 7rpm in 8 seconds, I have choosed a motor of 715 rpm output, what's the gear ratio I should use in designing the gearbox? Thanks

I once read that the best way to tune a drum is to first remove all the hardware, until it is just the shell, then hit it with a mallet, and match the frequency it resonates at with a tuning fork, then tune the top head the same frequency, and the bottom head slightly higher. This sounds good...

Base on the question, i would like to know the the torque,power transmission needed . diameter of cylinder: 1.2m length of cylinder:1.5m thickness of the drum: 2mm total load carry: 200kg how to determine the motor power needed?

A drum of radius R rolls down a slope without slipping. Its axis has acceleration a parallel to the slope. What is the drum's angular acceleration \alpha ? So v = R \omega and a = R \alpha .So is it just \alpha = \frac{a}{R} ?

I am driving a drum head with a rod. The rod goes up and down as the radius of a disc changes length (please see attached PDF). There is a gradual raise of the drum head, and then an abrupt drop. But there is a kink that the rod needs to overcome. Any suggestions on how to achieve this...

Here's some Bonzo: http://www.youtube.com/watch?v=3rOCa-qgbtc&mode=related&search= http://www.youtube.com/watch?v=u_fwcFjzyik&mode=related&search= http://www.youtube.com/watch?v=Fd4NDf7ciK4&mode=related&search= Great or what?

Okay, I need help with this question. It is killing me! :confused: A circular drum is spinning round and round. A person is on the wall of the drum and there is no floor beneath him. If the drum has a radius of 2.4m and takes 2.5s to comlete a revoltion, what is the coefficient of friction...

Plz can anyone here tell me something general things about DC series motor Drum Controller? I've been trying to find it out but all in vain! Plz help

The drum of the photocpying machine in problem 16 has a length of 42cm and a diameter of 12cm. What is the total charge on the drum? In problem 16 it says, The e filed just above the surface of the charged drum of a photocopying machine has a magnitude E of 2.3x10^5 N/C. So I first found the...

hey, i am in year 10 and i am doing an assignment on the physics of drums. if anyone knows anything that can help me that would be great. thanks. jack (jackio_14@hotmail.com)

Or the ping from a triangle the opposite side of the globe, lost in the back ground noise, some things may exist, but remain forever hidden to our detectors, if so how could they be of use to us? Can energy be dark, can matter hide from us, are we just the puff of smoke left over from the...

I am designing an in-vessel composting system - a 21 ft. long 4 ft. diameter steel tube that is mounted and spun on wheels by a hydraulic pump/turbine assembly, coupled to a 60:1 gear reduction box - the hydraulic pump will likely be powered by a small 4-5 HP gas powered motor. My question...