Kinematics Definition and 1000 Threads

Homework Statement A 55 kg woman jumps to the floor from a height of 1.5 m. If her body comes to rest during a time interval of 8.00 * 10^-3 seconds, what is the force of the floor on her feet? Homework Equations Unit conversion and g = 9.8m.s^2 ~ 10 m/s^2 The Attempt at a...

Pictures of the questions are attached below. For question 2, I totally cannot get any answer from the four choices after I substituted everything in the equation. For question 4, I used V^2= U^2 + 2AS, with U being zero, A being 9.8 and S being 2.0. I got C but the answer is D. Can...

(this is all in context to a java 2d object and is not homework related) I have an object with velocity v and position x. Its acceleration is directly proportional to velocity squared ie a=k v^{2}. Given the objects initial velocity u and its initial position x_{0} how would i work out its...

Physics Kinematics Homework Help!? "While standing on a bridge 18.3 m above the ground, you drop a stone from rest. When the stone has fallen 2.50 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same...

Homework Statement As a prank, your friends have kidnapped you in your sleep, and transported you out onto the ice covering a local pond. Since you're an engineer, the first thing you do when you wake up is drill a small hole in the ice and estimate the ice to be 6.7cm thick and the distance...

Homework Statement " An airplane turns slowly for 9.2s horizontally. The final velocity of the plane is 360km/hr [N]; the average acceleration during the turn is 5.0m/s^2 [W]. What is the initial velocity of the plane?" Homework Equations a=ΔV/t The Attempt at a Solution at=Δv...

Homework Statement A 1.5-lb brick is released from rest A and slides down the inclined roof. If the coefficient of friction between the roof and the brick is μ=0.3, determine the speed at which the brick strikes the gutter G. The Attempt at a Solution These are the equations that I got...

Homework Statement A hovercraft is traveling 3m/s at 180 deg. The fan of the hovercraft causes a=4m/s2 at 50° for 10 seconds. Homework Equations What is the final velocity? The Attempt at a Solution v = 3cos180 - 4cos50*10?

A light plane must reach a speed of 33 m/s for takeoff. How long must the runway be if the plane has a constant acceleration of 3.8 m/s2 ?so, I am new to kinomatic equations. We are using the 4 Basic ones. need to see this one worked out if I may.Thanks

How long does it take for a car o slow from 54 km/h to 32 km/h over 65 m ?

Homework Statement Questions 19 and 20 refer to the following information A particle of mass 2.00 kg moves under a force given by F~ = −(8.00 N/m)(i + j) where i and j are unit vectors in the x and y directions. The particle is placed at the origin with an initial velocity v = (3.00 m/s)i +...

Homework Statement Having aced your Physics 2111 class, you get a sweet summer-job working in the International Space Station. Your room-mate, Cosmonaut Valdimir tosses a banana at you at a speed of 14.0 m/s. At exactly the same instant, you fling a scoop of ice cream at Valdimir along...

1. Homework Statement The velocity of a particle moving along the x-axis varies in time according to the expression v(t)=α+βt2 α=46.4m/s β=4.25m/s3 t is in seconds Find the average acceleration in the time interval from t=0 to 3.63s. Answer in units of m/s2 2. Homework...

Homework Statement A particle moves along a straight line such that its acceleration is a = (4t2-2) \frac{m}{s^2}, where t is in seconds. When t = 0, the particle is located 1 m to the left of the origin, and when t = 2 s, it is 20 m to the left of the origin. Determine the position of the...

Homework Statement The engineer of a passenger train traveling at 25.0 m/s sights a freight train whose caboose is 200 m ahead on the same track. The freight train is traveling at 15.0 m/s in the same direction as the passenger train. The engineer of the passenger train immediately applies the...

So the problem is: a 1000 kg rocket is fired straight up, a 100 kg rocket is fired straight up with a constant acceleration for 16 seconds. It then stops accelerating and 20 seconds after launch reaches a height of 5100 m. Ignore air resistance. Find the acceleration of the rocket for the...

Homework Statement I am not going to use the exact same problem, as that would be cheating as this is for school, but Instead i will use an example problem: A can of pop is tossed directly upwards with an initial velocity of 4 m/s. How high will it go? Homework Equations I know...

1. The distance from two airports is 1286 km by air. Plane A leaves the first airport at 10:00a heading north toward the second airport, another plane leaves from the second airport at 11:00a heading south towards the destination plane A originally departed from. Plane A travels at 720km/h, and...

http://www.examsolutions.net/a-level-maths-papers/Edexcel/Mechanics/Mechanics-M1/2010-June/paper.php Q. 8 T = 3.36 a = 1.4 for part c) First I found the velocity of A after it has moved for 0.5 s, and the displacement it has moved after 0.5 seconds: I get that its velocity is...

Homework Statement a particle travels along a straight line and the acceleration is given by a = 30 - 0.2v determine the time when the velocity of the particle is v = 30Homework Equations \int \frac {dv}{ax+b} = \frac{1}{a} \ln (ax+b) The Attempt at a Solution This is the solution from the...

The problem: (Note: the correct answer is bolded throughout) A basketball is launched with an initial speed of 8 m/s at a 45 degree angle from the horizontal. The ball enters the basket in 0.96 seconds. What is the distance x and y? Just ignore the distance x, I know it's simply the product...

Hi guys. I'm new here. If i did any mistake please forgive me. First of all I have a simple problem need all of you to help me. Here is the problem The acceleration of a particle is defined by the relation a = -k√v, where k is constant. Knowing that x = 0 and v =...

Homework Statement 6) a helicopter blade spins at exactly 100 revolutions per minute. It's tip is 5.00m from the center of it's rotation. (a) calculate the average speed of the blade tip from the helicopters frame of reference. (b) What is it's average velocity over one revolution? radius...

Homework Statement { y }_{ f }={ y }_{ i }+{ v }_{ yi }t+\frac { 1 }{ 2 } { a }_{ y }{ t }^{ 2 }\\ { v }_{ yf }={ v }_{ yi }+{ a }_{ y }t Derive { { v }_{ yf } }^{ 2 }={ { v }_{ yi } }^{ 2 }+2{ a }_{ y }({ y }_{ f }-{ y }_{ i }) 2. The attempt at a solution This isn't an actual...

{ y }_{ f }={ y }_{ i }+{ v }_{ yi }t+\frac { 1 }{ 2 } { a }_{ y }{ t }^{ 2 }\\ { v }_{ yf }={ v }_{ yi }+{ a }_{ y }t It almost looks like the second equation is the derivative of the first equation with respect to time.

Homework Statement An electron is accelerated from rest to a velocity of 2.0x10^7 m/s. a) if the electron traveled 0.10m while it was being accelerated, what was its acceleration? b)How long did the electron take to attain its final velocity? V1= 0m/s V2= 2.0x10^7m/s d= 0.10m a=...

Homework Statement A barrel is lowered into a boat using the illustrated apparatus. The barrel can be considered to be a uniform cylinder with M=100kg and r=0.40m. The weight on the other end of the rope has m=30kg. Assume that the barrel does not slip against the wall, that the other 2...

Could someone point me to the proof or reasoning behind the steps: 1) a = dv/dt 2) a dt = dv 3) ∫a dt = ∫dv I know this works, but I'm missing understanding in the math behind it, and I'm not sure what to type into google. Thank you very much

Homework Statement Determine the relationship between the angular acceleration of the flywheel, the downward acceleration of the block, and the radius of the ring. Known data: Mass Ring: 1.420 kg Radius Ring (Inside, then Outside): 5.10 cm, 6.325 cm Mass Disk: 1.455 kg Radius Disk...

Folks, Trying to get some appreciation for what is going on in the attached schematic of 1)Euler bernoulli and 2) Timoshenko beam elements. For the first one, ie the top picture, how was ##u- z \frac{dw}{dx}## arrived at? thanks

Homework Statement I'm reviewing a chapter relating linear and angular kinematics, and I came across this equation.. why does it work and where does it come from? I can't seem to find anything in the textbook explaining it. Homework Equations a = sqrt( (tangential acceleration)2 +...

Homework Statement A basketball is thrown from a height of 2m. The direction of its velocity when it hits the rim of the basketball hoop is 45 degrees below the horizontal. The basketball hoop is 3m above the ground and 4.5 m in front of the shooter. How long does the ball take to hit the rim...

The equation v22 = vo2 + 2aΔy is used to determine the change in position, acceleration, or velocity of a particle under the influence of a quadratic force. on earth, the acceleration value in this equation would, under normal circumstances, be a= -9.8 m/s2. so, this...

Homework Statement Given: m = 17kg Vi = 0 Fa=42N θ=25 Mu=0.15 T=125s Diagram: http://s14.postimage.org/euy3whikh/New_Bitmap_Image.png Find: Δd a block accellerates from rest for 125s find the displacement. Frictional forces act on the block. A force applied is 25 degrees above the...

Hey everyone, I have a question from a past exam paper that I was doing. I spent a lot of time trying to solve it, however I have failed. I would appreiciate it if I got some assistance from a professional or someone that can answer it correctly. Question: A car is parked on the side...

Homework Statement 5. An object is thrown vertically upwards with a speed of 72 kilometres per hour. How long does it take to reach a point 25 meters below the starting point? You can take g as 10 ms-2 for convenience. Here is my answer. I got 4 yet the answer is 5...

A swing bridge has to be turned through a right angle in 120 seconds. The first 50.4 seconds is a period of uniform angular acceleration ; the subsequent 34.8 seconds is a period of uniform angular velocity and the third period of 34.8 seconds is a period of uniform angular retardation. Input...

Hello, I have a general question regarding what is the best controller (PI, PD, etc.) to control the position of a mobile robot in order to follow a known path. The mobile robot at hand is a mechanism (a 4 bar linkage with its two base gliding on two parallel but not straight rails) and I...

Homework Statement In a 1985 study, cats were trained to jump up and touch a cotton ball in an effort to study their thigh muscles. One cat was able to jump 2.93 meters off the ground. What is its hang time? In other words, what total time was the cat in the air? s What was its...

What happens to range if the initial height is doubled. Say if something is shot at 2 ft and then its shot at 4 ft high, what happens to range? I know that its conservation of energy. I just have no idea how to come up with the right answer

Range and Height Kinematics? What happens to range if the initial height is doubled. Say if something is shot at 2 ft and then its shot at 4 ft high, what happens to range?

A flywheel 1.2 m in diameter is uniformly accelerated from rest and revolves completely 68 times in reaching a speed of 125 rev/min. Find the time taken to reach this speed i have been given the correct answer as 65.29 seconds Wht i have up to now ω1 = 0 ω2 = 125 r/min = 125/60 =...

[b]1. Consider a fan that has rotated by a total of 2 complete revolutions from where it started. This quantity (2 revolutions) is analogous to what quantity in linear kinematics? Position Displacement Velocity Speed Time Time Homework Equations I am...

Homework Statement A ball is thrown upward from a building 30 meters tall and misses the edge on its way down, hitting the ground 6 seconds after it was thrown. A) With what speed was it thrown? B) What is its highest height?Homework Equations Vf = Vi + at x = 1/2(Vi + Vf) x = Vi t + 1/2(at^2)...

I need a lot of help with Kinematics and Dynamics so forces and motion would be what you can call that. I have a teacher that does not teach, I have had her for two years in a row now so if I had some knowledge from grade 11, It would still help me but I learned close to nothing in Grade 11 and...

Homework Statement http://imgur.com/fGYf0 Stuck on #3 Homework Equations V = Vi + a*t Y = (1/2)gt^2 + (ViY * t) + Yi The Attempt at a Solution I have found the vertical and horizontal components and the initial velocity. ViX = 6.2 ViY = 9.922 Vi = 11.7 Yf = 0 Yi = 7 Xi =...

Homework Statement A ball is thrown vertically upward from a window at 10m/s. It hits the ground 5.0 seconds later. What is the height of the window from the ground? Given Vi = 10 m/s Vf = 0 Δt = 5.0 m/s Δa = -9.8 m/s^2 Find Δd(w-g) = ?Homework Equations Δd = Vi(Δt) + Δa(Δt)^2 And the...

Homework Statement Suppose that a woman driving a Mercedes zooms out of a darkened tunnel at 30.3 m/s. She is momentarily blinded by the sunshine. When she recovers, she sees that she is fast overtaking a camper ahead in her lane moving at the slower speed of 13.7 m/s. She hits the brakes as...

Homework Statement Maverick in an F-14 is moving at a constant velocity of 509 km/hr. He is chasing a "bogey," also known as a Russian MiG-28 (at least, in the movie they were - there's no such thing as a MiG-28), which is moving with a constant velocity of 592 km/hr in the same direction...

Homework Statement A balloon is at a height of 81 m is ascending upward with a velocity of 12 ms1. A body of 2 kg weight is dropped from it. If g = 10 ms2, the body will reach the surface of Earth in what time. Homework Equations The Attempt at a Solution I don't think mass...