Bolt Definition and 136 Threads

I am looking for a graph of velocity vs time for the 200m race of Mr Usain Bolt which he did in 19.30 seconds he did during the olympic races. I appreciate if someone can provide it in this forum. Thanks Ps. sorry if i posted it in the wrong place, but i don't in which category i should put it.

Homework Statement A bolt comes loose from the bottom of an elevator that is moving upward at a speed of 6.88 m/s. The bolt reaches the bottom of the elevator shaft in 3.90 s. How high up was the elevator when the bolt came loose? Homework Equations d= v(initial)t + .5at^2 The...

Hello, all. Can someone please direct me to a good source of information which explains how the threaded fasteners in a circular bolt pattern - such as used in a flanged joint - collectively "share the load", and how the stresses which arise due to tension, bending, and shear forces acting upon...

Homework Statement During a lightning strike, 30C of charge may move through a potential difference of 1.0 x 10^8 V in 0.02s. The total energy released by this lightning bolt is ______ J. Homework Equations I = q/t The Attempt at a Solution I'm really not sure what to do...

Motion question - please help Homework Statement A lift ascends with an upward acceleration of 1.5ms^(-2). At the instant its upward speed is 2.0ms^(-1), a loose bolt drops from the ceiling of the lift 3.0m from the floor. Calculate: (a) the time of flight of the bolt from ceiling to floor...

I'm installing a set of front brake calipers on my track car, and the mounting brackets are made of aluminum (7075). What is the better mounting scenario - Thread the mounting bolts directly into the aluminum, or use a through hole mounting method with a proper bolt and nut combination? The...

This is a problem given for laboratory analysis, but there are no relevant equations in our textbook to help solving the problem. Could anyone just give me a hint on what equation should be used to solve the problem? the only relevant equation I know is : shear stress = F/A 1. The figure...

Homework Statement Consider a simple helicopter blade, attached to a bolt at its end. The bolt is made to rotate by a powerful motor, and the blade therefore rotates. The blade has a length L= 7.8 m and mass M= 100 kg. The blade is shaped approximately like a long thin, uniform rod. What...

I have a suspension arm that I am rebuilding, the main reason is to make it adjustable in length, and the other is to replace the ball joint. The original equipment is a standard automotive ball joint, greased and the shaft is 1 piece with the ball. The new setup would use a 5/8 spherical...

Homework Statement You are trying to loosen a stuck bolt on your RV using a big wrench that is 50 cm long. If you hang from the wrench, and your mass is 55 kg, what is the maximum torque you can exert on the bolt? Homework Equations T=Fr I did T=55kg*.5m The Attempt at a...

Homework Statement We were provided with the dimentions and specifications for a highway sign, and given assumptions for weight and wind forces acting on it. Firstly, we had to calculate the reactions at the base. And then draw stress blocks and Mohr's circle for four points on the base of...

I need to spec out some bolts according to the NAS standard. The problem is that I only have the dimensions/specifications in ANSI format. Has anyone ever worked with NAS before? I can't find anything to help me figure out what size bolt I need.

if a beam has a shear force limit of x and a bolt that is passing through the beam has a shear force limit of y and y < x would the maximum allowable shear force for the whole system become y?

I have a flange of known thickness, with a bolt hole of a known diameter through it. I am trying to calculate the maximum angle off from the centerline through the bolt hole that the bolt will be able to pass ( I know the max diameter of the bolt as well ). Is there a formula for this, given...

1. The Funny Intro: The summer before he entered high school, Prof. Schueller’s had to run the farm because his father had an emergency appendectomy. To adjust the “thread” (the width between the wheels) of a John Deere 4020 tractor, a torque of about 1600 ft-lbs. was needed to loosen...

I should preface this, this may be the stupidest question yet on this forum. But I can't get it to work out right so I'm going wrong somewhere obvious I'm sure... Homework Statement A crossbow is readied for release. Suppose it takes 45.0 pounds of force to draw the arrow back by 13.0...

the shear stress in each bolt is to be limited to 250mpa. i need to determine the minimum diameter of the bolts and the distance from the end edge of the centre plate to the centre of the bolt holes. All plates are 6mm thick and the punching shear stress for the centre plate is not to exceed...

Hi All, We have manufactured a custom bolt (similar to standard bolt). Now we need to calculate the fatigue life of the bolt. Could you please guide me in calculating the fatigue life? Thanks, Ana

Hi, What is Proof load of a bolt? I need to calculate the proof load of a bolt? I have searched the net but could not find it. Please help me. Thanks, Ana

Hello all, I have an experiment set up where I need to compress some material using some G clamps. I have a torque wrench which I can use to tighten up the gclamp to a known torque but am having trouble converting this to the linear force that will actually be applied to the material...

Anyone determine what the definition/properties of this bolt is? 3/4 x 4 CS-N-LW

Coaching grade school track, I have to carry around several starting blocks. Last year, to store for the next season, I made a rude carrier from 3/4 plywood that held 5 blocks, stacked on top of each other. I put wheels on the back of the cart, using shoulder bolts, which the kind man at Home...

A rigid flange coupling, secured by 3 bolts on a PCD of 200mm, is subjected to a torque of 10kN/m. Determine the bolt diameter (to the nearest mm) Bolt material shear stress = 225N/mm^2 Factor of safety = 2 Hi, I'm chris, I'm an aeronautical engineering student and I'm a little puzzled by...

A strong lightning bolt transfers about 25 C to Earth. How many electrons are transferred? 1 electrons = 1.60E-19 so.. 25 / 1.60 E -19 = 1.5625E-18 electrons but the answer that my teacher gave us is 1.6 E 20 electrons what did i do wrong?

Homework Statement A bolt is dropped from a bridge under construction, falling 98 m to the valley below the bridge. (a) In how much time does it pass through the last 30% of its fall? (b) What is its speed when it begins that last 30% of its fall? (c) What is its speed when it...

A bolt comes loose from the bottom of an elevator that is moving upward at a speed of 6.38 m/s. The bolt reaches the bottom of the elevator shaft in 3.85 s. How high up was the elevator when the bolt came loose? I integrated 6.38 to get the position equation and plugged in 3.85. However...

It is a multi positional obstructed screw, nut , bolt starter, it is very functional and can save hours of build time, material costs are well below a £1, the tool could be a throw away or reusable for repeat jobs. Would there be a market for such an invaluable tool?

Homework Statement The Electric field between a cloud and the ground is 1.0X10^6 N/C. If 35C of charge is transferred to the ground (lightning bolt) over a distance of 2.3km, what is the voltage of the cloud. Homework Equations q=mg/E? The Attempt at a Solution I don't have the...

I just want to clarify. A tapped hole is basically a hole that has been threaded for a bolt. Is this correct? So would a tapped M6 hole be 6mm in diameter for a 6mm diameter bolt? Cheers

This is the second time I write this post because the first time it got deleted...so I must say that I am not going to go into all the detail that I went into the first time I wrote this..not to mention that I'm a bit p.o.'d. In back to the future, doc brown says that a lightning bolt can...

I need help getting started on this. Question: An iron bolt is used to connect two iron plates together. The bolt must withstand shear forces up to about 3200 N. Calculate the minimum diameter for the bolt, based on a saftey factor of 6.0. Here is what I know so far. Shear Strength is 170...

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.70 s later. Find the rockets acceleration. I don't understand how to set up this problem, I've never done something like this ...

Help me find a bolt... Ok, I'm lookng for a bolt distributor (as close to the Detroit area if at all possible) who sells NAS/MS bolts. Specifically, I need 8 MS21250-05056's. I know this is an odd request, but I've searched high and low for said jewels but the distributors I've dug up thus...

Which one has more magnetic field Torus or Bolt when current is going though? :eek:

In a lightning bolt, 14 C of charge flows in a time of 1.5 x 10^-3 s. Assuming that the lightning bolt can be represented as a long, straight line of current, what is the magnitude of the magnetic field at a distance of 27 m from the bolt? do i use 27 m as the radius in the equation B =...

Two questions. 1. a negative lightning bolt delivers a 15C charge from the ground to the BASE of a thunder cloud (Vpd = 5.0GV) 2. A positive lightning bolt delivers 20Ccharge from the Top of a thunder storm cloud to the ground (Vpd=30GV). Both questions ask how much work is done to move...