Kinematic Definition and 395 Threads

Hi, I am a PhD student in math and in my current research I'm faced with the problem of analyzing the rigidity of a structure of rigid beams in 3D, that is if the structure can move. In particular, something like this: http://img525.imageshack.us/img525/1545/98322092.th.jpg where all...

Homework Statement A car starts from rest and accelerates uniformly at 3 m/s2. A second car starts from rest 6 s later at the same point and accelerates uniformly at 5 m/s2. How long does it take the second car to overtake the first car? How would I solve this? If someone can break it down...

Homework Statement Metal ball is launch at 30 degrees from initial height of 1m with initial speed as 7.66m/s, find horizontal distance traveled Homework Equations The Attempt at a Solution Honestly I have no idea.

Homework Statement Baseball is throwing upwards with initial velocity as 12m/s. Total time it took to reach ground is 2.53 seconds. Find the initial height where baseball was thrown. Homework Equations The Attempt at a Solution Find d t=2.53 Vo=12 0=d+Vo*t-4.9t^2 0=d+12*2.53-4.9t^2...

Homework Statement A truck covers 60.0 m in 9.0s while smoothly slowing down to final speed 3.00 m/s. Find the initial velocity. Homework Equations Vi +1/2at^2 has two unknowns V= vo + at has two unknowns x= v^2 - Vi^2/2a has two unknowns v^2=vi^2 +2a(xf-xi) has two unknowns...

Homework Statement An object falls from height h from rest. If it travels .5h in the last second before hitting the ground, determine how long it takes to fall and the height h. xi = .5hm, t =1s, a = 9.8m/s^2, xf = 0m, Homework Equations Vf = Vi + at xf = xi + .5at^2 The Attempt at a...

Homework Statement A spaceship of mass 5.00 x 104 kg is traveling at a speed 1.15 x 104 m/s in outer space. Except for the force generated by its own engine, no other force acts on the ship. As the engine exerts a constant force of 4.00 x 105 N, the ship moves a distance of 2.50 x 106m in...

hey guys I am new to the forum... i am a first year civil engineering student trying to do a second year course over this summer holiday. for fluid mechanics i was given this h/w problem. could you please tell me if I am correct and if not make explain where i went wrong and how to correct it...

can someone tell me the exact definition of kinematic pairs?and kinematic chain? which is the one where relative motion is constrained?

Homework Statement Determine the initial velocity of a ball which starts 3ft above the ground travels a distance of 180ft and has an angle of 30 degrees; taking into account gravity as 32.2ft/s2. Homework Equations I have been having trouble as to how to get the time in which it takes the...

The Equivalence Principle suggests the possibility that a 'kinematic' paradigm might produce exactly the same cosmic observations as the standard 'expanding space' paradigm. In my view, functional equivalence demands that the 'kinematic' paradigm make the same observational predictions as the...

v = v0 + a*t x = x0 + v*t Is there a page or a website where I can view kinematic equations like this which explains them and list them all down.

Homework Statement An explorer drops a pebble into a cavern to see how deep it is. At 1.8 seconds, the explorer hears the pebble hit the water. The speed of sound travels at 345 m/s in the cave. How deep is the cavern? This seems like a kinematic question but I can seem to get the right...

Homework Statement Two cars start 10 meters up a hill. Car A has a mass of 9 grams and Car B has a mass of 2 grams. Additionally, both cars must travel the same distance to the finish line. a) If friction is ignored which car will win the race? b) If friction is not...

Homework Statement My question is for concept clarification, not a problem that needs to be solved/calculated. I posted this question previously, "The velocity graph of a particle moving along the x-axis is shown. The particle has zero velocity at t=0.00 s and reaches a maximum velocity...

Homework Statement Solve the equation below for deltaX symbolically and simplify the answer as much as possible. deltaY = (tan A)deltaX - g*deltaX^2/2V(initialx)^2 Homework Equations quadratic equation. The Attempt at a Solution I can handle the algebra and simplification. My...

Homework Statement I need to find the average acceleration of a gramophone record. Initial angular velocity, W = 0 Final angular velocity, w = 3.50rad s^-1 angular displacement, 8 = 0.25rad Homework Equations The equation given by the answer is t= 8/w a = ( w - W ) / t the answer is 49.0...

Can anyone help me familiarize myself with the Kinematic Equations of Motion? I need to know them for this summer institute. Thanks, Randeezy

Use the Kinematic Equations vf = vi + AT and D= viT + 0.5AT2 to show that Vf2 = vi2+2ad

Hello, Could anyone help explain what Kinematic and Isotropic hardening are. Any brief explanation or reference to a good book that explains these topics would be very useful. Thank you

Homework Statement A runner wants to run a 1500m race with an average velocity of 6.00m/s. After running the first 500 m, he notices that the elapsed time is 1 min 40 seconds. Panicking, he accelerates for "t" seconds at 0.20 m/s² and then finishes the race at his new faster speed. He makes...

Homework Statement Homework Equations The Attempt at a Solution The template doesn't really apply to what I need help with. I've missed some school and I need help rearranging Kinematic equations. I am new to physics so please use plain english. Here's the specific one I am having problems...

Homework Statement ok well this was my homework over the weekend and i think i got an idea of how to solve these but I am not quite sure on my answers... I've scanned the problems because they all require diagrams that must be seen to solve the problems...

a body moves according to the following: ay=2-4t ax=-1 vy=2t-2t2 vx=1-t x0=2 y0=3 what is the tangential acceleration when t=1? what is the radius of curvature of the motion when t=1? aT=\vec{a}dot\vec{v}/|v| at t=1, \vec{v}=0 so there is no tangential acceleration, how can this...

Homework Statement Using the appropriate kinematic equations and initial values, determine the position and velocity at t=2.40 s. (x, y)=0, 0 (vi, 0)=(25.0 m/s, 65.0 degree) a.Horizontal Velocity of the initial velocity b.Horizontal/Vertical Velocity at 2.40 s c.Horizontal...

Homework Statement A 52.2 kg pole-vaulter falls from rest from a height of 3.6 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.34 s after landing on the pad. (a) Calculate the athlete's velocity just before reaching the pad. (b) Calculate the constant force exerted on the...

What is the difference between a structure being statically indeterminate and being kinematic? Are they the same?

Homework Statement I have a problem worksheet for my 'Physics A' class. It deals with 1-D Kinematics, which we are just getting into so I am not very sure what equations I need to use. I'm not asking for someone to answer them for me, but to maybe give me a list of a few equations that would...

So I am trying to fully understand how to come about the kinematic equations for uniformly accelerated motion. So v = dr/dt and a = dv/dt How does the math work behind this I know the second is the derivative of the first. dr = v*dt dv = a*dt So dv is the...

Homework Statement Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. When you increase your speed by 5.0 mi/h, the time to go one mile decreases by 13 s. What was your original speed in mi/hr? Homework Equations X (which in...

Hello, I have a question concerning the kinematic equations http://www.glenbrook.k12.il.us/gbssci/phys/Class/1DKin/U1L6a1.gif vi and vf stand for initial and final velocity, my question is: do these velocities need to be the initial (t=0) and final (end of the motion)? can't I just...

Homework Statement In a local bar, a customer slides an empty beer mug down the counter for a refill. The bartender is momentarily distracted and does not see the mug, which slides off the counter and strikes the floor 1.10 m from the base of the counter. The height of the counter is 0.820...

Homework Statement A golfball is hit with a velocity of 25m/s at an angle of 40 degrees above the horizontal. What are the horizontal and vertical components of the velocity? i don't want the answer that's not my objective... just the correct formula cause I've been using all these...

Homework Statement A pilot heads his airplane due east at a speed of 75 m/s. While he is flying, a wind blows at 60 degrees North East with a constant speed of 25 m/s. What is the reultant velocity of the plane? Homework Equations s=(u+v/2)t, v=u+at, and s=ut+1/2at² The Attempt at...

Homework Statement A 50.0 g Super Ball traveling at 28.0 m/s bounces off a brick wall and rebounds at 19.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval...

Please see the attached problem I came up with. I've done similar problems to this in school, but never with the frictional force acting along a curve. I'm wondering if my solution is valid, or if the integral needs some work? And I just realized I left out the mass [M] in the normal force...

One interesting thing in quantum mechanics is that there are correlation effects which can manifest themselves as dynamic effects, for example, as kinematics of fermions can make free electron model a good approximation for some phenomenons observed in solids, by effective cancellation of very...

arXiv:0808.1081 (cross-list from physics.pop-ph) [ps, pdf, other] Title: The kinematic origin of the cosmological redshift Authors: Emory F. Bunn, David W. Hogg Comments: 14 pages. Submitted to Am. J. Phys Subjects: Popular Physics (physics.pop-ph); Astrophysics (astro-ph); General...

I am not sure if I'm in the right section to post this, but I'm going to try anyway... http://img124.imageshack.us/img124/6281/clipboard02ub1.jpg Could anybody please show me how to sketch a kinematc scheme of this structure? I don't know how to represent the joints (especially the...

When doing SUVAT problems, why does the item which begins motion later given a time "t-x" where x>0. For example, if dropping a ball, and then dropping another ball 5 seconds later, the first ball's time can be expressed as "t" and the second ball's time as "t-5". Why is it not t+5? Thanks

M. Chodorowski argues in his http://arxiv.org/abs/astro-ph/0610590v3" that the concept of "expansion of space" is not necessary to explain the expansion of the universe, and therefore Occam's Razor tells us that we should consider discarding the concept entirely. He says that expansion is...

hard kinematic problem, need...help...pls:) Homework Statement A policeman (on a motorcycle, with the engine going) is hiding behind a bush on the side of the road when a speeding truck passes with a speed of 96.5 km/h. As the truck passess he sets off with an acceleration of 1.83 m/s, which...

kinematic question, i think it's hard:( Homework Statement Two camels leave the spinx at time 52.5 s apart. The first moves off with a uniform acceleration of 1.30 m/s2, which it maintains for 1.92 s. It then continues with the acquired speed. The second camel moves of with a uniform...

Homework Statement A bell is thrown vertically upwards with speed 10m/s from a point 2 m above horizontal ground. a) calculate the length of time for which the ball is 3m or more above the ground Homework Equations kinematic ones The Attempt at a Solution We I wanted to find the...

Homework Statement If we have a velocity-time graph that is negatively accelerating, how would we draw the graph for the acceleration time graph? Would we draw it below zero because it is negatively accelerating (negative number). The picture of the graph is attached. The Attempt...

[SOLVED] Kinematic motion problem Homework Statement A police car stopped at a set of lights has a speeder pass it at 100 km/h. If the police car can accelerate at 3.6 m/s^2, a) how long does it take to catch the speeder? b) how far would the police car have to go before it catches the...

[SOLVED] Kinematic motion problem. (acceleration, displacement, velocity) Homework Statement Two rugby players are running towards each other. They are 37 m apart. If one is accelerating from rest at 0.5 m/s^2 and the other was already moving at 3.1 m/s and maintains her speed. (brackets are...

[SOLVED] Kinematic Equations This is the question. I have sat here and tried to figure out how to even start this problem for hours. I can't seem to get it through my head. If someone could help me set it up, I can figure out the rest I think. Thanks in Advance. Q. A car and a...

[SOLVED] Different values with rotational kinematic equations Hello everyone, I got two different values for final angular speed when I tried to use the third and fourth kinematic equations. I filled the template here with the problem with my attempts. Homework Statement A bicycle wheel of...

Hey, Would anyone be able to solve this Kinematic Problem? At least approximately. The mechanism in question is a cylinder, piston and a slider. The cylinder is fixed on a pivot in the middle of its body, obviously from the outside. I have found some approximate solution, but I am...