One dimensional Definition and 134 Threads

Homework Statement A hot-air balloon has just lifted off and is rising at the constant rate of 2.3 m/s. Suddenly one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 12 m/s. If the passenger is 2.5m...

Homework Statement 1) Runner A is initially 4.0 mi west of a flagpole and is running with a constant velocity of 6.0 mi/h due east. Runner B is initially 3.0 mi east of the flagpole and is running with a constant velocity of 5.0 mi/h due west. How far are the runners from the flagpole when...

Homework Statement 52. A baseball player catches a ball 3.1 s after throwing it vertically upward. With what speed did he thow it, and what height did it reach? Homework Equations def of a = t^-1 (V - Vo) The Attempt at a Solution t = (3.1 s)2^-1 = 1.55 s def of a = t^-1 (V -...

Homework Statement A baseball pticher throws a baseball with a speed of 44 m/s. Estimate the average acceleration of the ball drugin the trowing motion. It is observed that in throwing the baseball, the pitcher accelerates the ball through a dsiplacement of about 3.5 m, from behind the body...

Homework Statement A toy rocket passes by a 2.0 m-high window whose sill is 10.0 m above the ground. The rocket takes .15 s to travel the 2.0 m height of the window. What was the launch speed of the rocket, and how high will it go? Assume the propeltant is burned very quickly at blastoff...

I know this problem has been posted before, but I think my answer is correct and I want to know why it was considered wrong! Homework Statement Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance Da beyond the...

Homework Statement A rock is thrown vertically upward with a speed of 12.0 s^-1 m. Exactly 1.00 s later, a ball is thrown up vertically along the same path with a speed of 20.0 s^-1 m. (a) At what time will they strike each other? (b) At what height will the collision occur...

Homework Statement A rcok is dropped from a sea cliff and the sound of it striking the ocean is heard 3.4 s later. If the speeds of sound is 340 s^-1 m how high is the cliff. Homework Equations X = Xo + Vo t + 2^-1 a t^2 The Attempt at a Solution Ok 340 average velocity and sense...

Homework Statement A runner hopes to complet the 10,000 m run in less than 30.0 min. After running at constant speed for exactly 27.0 min, there are still 1100 m to go. The runner must tehn acceelerate at .20 s^2 m for how many seconds in order to achieve teh desired time? Homework...

Homework Statement A system consists of N very weakly interacting particles at temperature T sufficiently high so that classical stat mech is applicable. Each particle has mass M and is free to perform one dimensional oscillations about its equilibrium position. Calculate the heat capacity...

Homework Statement Challenge Problem(2.96) from University Physics textbook: In the vertical jump, an athlete starts from a crouch and jumps upward to reach as high as possible. Even the best athletes spend little more than 1.00s in the air (their "hang time"). Treat the athlete as a particle...

Do one dimensional vectors have a sign? (:devil:)

Homework Statement "A race car driver must average 180 km/h for 4 laps to qualify for a race. Because of engine trouble, the car averages only 150 km/h over the first 2 laps. What speed must be maintained for the last 2 laps?" Homework Equations v= d/t The Attempt at a Solution i...

Homework Statement A .3 kg ball is compressed a maximum of 0.6 cm when it strikes the floor at 9.29 m/s. Assuming acceleration is constant, what is the force the ball exerts on the floor? Homework Equations vf^2 = v0^2 + 2A(x-x0) Once I find A it will be easy, since F=MA The...

Homework Statement There is a child's toy, which has the shape of a cylinder mounted on top of a hemisphere (the picture the book has looks like a half of a circle with a square on top.). The radius of the hemisphere is R and the CM of the whole toy is at a height h about the floor. (this in...

When setting up this derivation one assumes a chain of identical atoms. The interatomic interaction between atoms is short ranged and so only affects neighbouring atoms (see Hook and Hall, "Solid State Physics" chapter 2.3.1). The potential V(r) is expanded as a taylor series about r = a to...

Homework Statement Polymers are made of very long molecules, usually tangled up in a configuration that has lots of entropy. As a very crude model of a rubber band, consider a chain of N links, each of length l. Imagine that each link has only two possible states, pointing either left or...

Homework Statement An object is released from rest at a height h. It travels 0.31h during the first second of its descent. Determine the average velocity of the object during its entire descent. Homework Equations X - Xo = Vot + .5at^2 v^2 = Vo^2 + 2a(X - Xo) X - Xo = .5(Vo + V)t...

The area under both curves (velocity vs time) from t =0 to t =tf is the same. Which of the following quantities is the same from t =0 to t = tf? A. average position B. average velocity C.average accerleration D. total displacement E. jerk( the derivative of accerleration. THE...

hi, I am not getting idea to solve below problem A particle of mass m is in a one-dimensional ,rectangular potential well for which V(x)=0 for 0<x< L and V(x)=infinite elsewhere. The particle is intially prepared in the ground state ψ1 with eigen energy E1. Then , at time t=0, the potential...

Homework Statement A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the intersection is 29.9 m. The plane decelerates through the intersection at a rate of 6.33 m/s2 and clears it with a final speed of 42.3 m/s. How...

I'm not looking for a solution, but rather trying to understand the question. We've been given a series of potentials, U(x), and have been told to find the one-dimensional particle motion in them. For example: U(x) = V(tan^2(cx)), V>0 My initial reaction was just to solve it for x(t)...

a particle moves along the x-axis. its position is given by the equation x=2+3t-4t^2 determine its position when it changes direction. and its velocity when it returns to the position it had at t=0

Hello. Is a quantum vacuum 1 dimensional? Thanks.

Homework Statement Solve: \frac{\partial u}{\partial t} = k\frac{\partial^2 u}{\partial x^2}, 0<x<\pi, t>0 with initial condition u(x,0)=f(x)=\left\{\begin{array}{cc} 1,& 0\leq x< \pi/2 \\ 0, &\pi/2 \leq x < \pi \end{array}\right and with non-homogeneous boundary conditions...

Could someone help me out on the following questions? Q. Consider the free vibrations of a string of length L clamped at x = 0 and constrained at x = L such that u_x \left( {L,t} \right) = - ku\left( {L,t} \right),k > 0. (a) Show that the eigenvalues are given by the positive roots of...

Hey everyone, Well, I am sort of stuck on this problem: Two trains, one traveling at 78 km/h and the other at 135 km/h, are headed toward one another along a straight, level track. When they are 980 m apart, each engineer sees the other's train and applies the brakes. The brakes decelerate...

Sir, Please say whether these 2 problems are right. 1) A body of mass 2kg moving on a horizontal surface with an initial velocity of 4 m/sec comes to rest after 2 seconds. If one wants to keep this moving on the same surface with same velocity, what is the force that is needed to be...

Hello, I was wondering if someone could help me out with this one. Its been years since I've done physics and this problems is bugging the hell out of me. Thanks

Hello, I've been working on the following problem for quite some time, with no success: A commuter train travels between two downtown stations. Because the stations are only 1.15 km apart, the train never reaches its maximum possible cruising speed. The engineer minimizes the time t between...

[FONT=Arial Black]A car traveling @ 120 km/h passes by a parked police car. If it takes 5 seconds to start the police car, which then accelerates @ 3 m/s^2 to a maximum speed of 150 km/h, how far does the police car travel in overtaking the speeding car, which maintains a speed of 120 km/h...

An object is moving in a straight line with a constant acceleration. Its position is measured at three different times, as shown in the table below. Time (s) | Position, (m) 56.40 | 9.700 58.20 | 19.042 60.00 | 38.428 Calculate the magnitude of the acceleration at t=58.20 s I am not...

I do not understand and cannot comprehend anything existing in a single dimension. I have heard briefly that strings exist in a single dimension. How would you describe a single dimension? I understand 3 dimensions, length- height-depth. But wouldn't a single dimension object be invisible in...

can anyone help me with this problem please-- A tortoise can run with a speed of 0.10 m/s and a hare can run 20 times as fast. in a race they both start at the same time but the hare stops to rest for 2.0 minutes. the tortoise wins by 20 cm. how long does the race take? what is the...