Linear motion Definition and 119 Threads

Homework Statement I am unable to solve part b and please help me check whether is there anything wrong with my graph..:redface:The Attempt at a Solution Segment A Vi=0 V=3 S=60 a=9.81 v=vi+at 3=0+9.8(t) t=0.305s Segment B Vi=3 V=0 a=-2 v=vi+at 0=3-2t t=1 t=1+0.305=wrong answer :cry:

how were these equations derived or found? x = xo + vot + 1/2at2I tried to use v=(xf-xi)/(tf-ti) and a=(vf-vi)/(tf-ti) but I don't know where the 1/2 comes from also this one: v2 = vo2 + 2a(xf-xi)

Homework Statement If the acceleration of a particle on a horizontal line is x where x represents the position in centimetres from the starting position of zero and if the initial velocity is 8 centimetres per second find the velocity of the particle when it is in a position of 15...

Homework Statement Compare the role played by the moment of inertia in rotational motion, to that played by mass in linear motion. Homework Equations I have no idea how to tackle this question. I tried looking up the defenition of moment of inertia as a start, but I only found anything...

Homework Statement A student standing on top of a cliff drops a rock down below into the water and hears it splash 3 seconds later. The speed of sound is 330m/s, what is the height of the cliff Homework Equations v= d/t v2 = v1 + at d = v2-1/2 at2 d = (v1 + v2)t v2 squared = v1...

Does there exist a device to convert a unidirectional linear motion into a rotational motion? I have only been able to find devices which do the exact opposite. I am probably missing out on some kind of key point here but I don't have much of a background in physics so please don't slam me too...

First post! I would be grateful if anyone could give me any advice on this particular type of problem (i.e min retardation to avoid a crash). I'm not necessarily looking for the answer to this specific question, I would rather if someone could point me in the right direction as to how to go...

Hello all, I've been working my way through my homework this week, and haven't had much trouble until I hit this question... Homework Statement An automobile and a truck start from rest at the same instant, with the automobile initially at some distance behind the truck. The truck has a...

Homework Statement A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.6 m/s and ax = +6.3 m/s2. The y components of the puck's initial velocity and acceleration are v0y =...

I don't know if I'm using the terms properly, since I am no mechanical engineer, but I am attempting to find the best way to convert rotational work from an electric motor to draw a long, high-torque linear stroke, followed by a very fast return stroke. To clarify my question, I trying to...

I wasn't even sure how to title this exercise since I don't really know how this movement is being officially called in English, I just called it "circular and linear motion" as a translation from Hebrew. Homework Statement http://img842.imageshack.us/img842/2149/xycoordinate.jpg The...

can a body moving in a straight line be in rotational motion as well?

Homework Statement Heres is the problem I am trying to solve: George of the jungle, with mass m, swings on a light vine hanging from a stationary tree branch. a second vine of equal length hangs from the same point, and a gorilla of larger mass M swings in the opposite direction on it. Both...

Homework Statement Two friends see each other in a store and are initially 50m apart. The first friend starts walking towards the second at a constant speed of 0.50 m/s. At the same instant, the second friend accelerates uniformly from rest at a rate of 1.0 m/s^2 toward the first friend. How...

Homework Statement A cyclist starts at the top of a straight slope with an initial velocity of 3.00m/s. Five seconds later, she is at the bottom of the incline, having traveled 50.0m. Find her velocity at the bottom of the hill and her acceleration, assuming it to be constant. Homework...

Homework Statement Automobile Tire: If a car runs over a nail at 55 mi/hr and the nail is lodged in the tire tread 13 in. from the center of the wheel, then what is the angular velocity of the nail in radians per hour? Homework Equations w = alpha/time a = s / r The Attempt...

Homework Statement Airport runway designing: (i)lowest acceleration rate of any plane is likely to be 3m/s^2.Take off speed for this airplane will be 65m/s.what is minimum allowed length of runway? (ii)If airplane accelerates down runway at 3.2m/s^ for 32.8 seconds until it lifts...

Homework Statement A cat sitting in a field suddenly sees a standing dog. To save its life, the cat runs away in a straight line with speed u. Without any delay, the dog starts with running with constant speed v>u to catch the cat. Initially, v is perpendicular to u and L is the initial...

The function v(t) = 9 - t2 is the velocity in m/sec for a particle moving along the x-axis, where t is measured in seconds (t is greater than or equal to 0). Use analytic methods to solve: (a) When the particle is moving to the right, to the left, and stopped. (b) The particles displacement...

Comparing Rotational and Linear Motion -- block vs. disk vs. ring Homework Statement A disk and a ring, both of mass M and radius R, are placed atop an incline and allowed to roll down. A block, also of mass M, is placed atop the same frictionless incline and allowed to slide down. How do...

Okay so I did a lab on Linear Motion using the glider with the air track and a spacer. This is the information I have about the glider and spacer. glider mass = (468.7 +/- 0.02) g thickness of spacer =(14.8 +/-0.05) mm I'm stuck on doing the error analysis and I don't know how to go on...

OK This is a multi step problem that I really do not understand. Here it is: Carefree Carnie is driving her parents automobile on an autumn day. While driving with the cruise control set at 50 miles per hour, she notices a construction project's road block in her lane 60 meters ahead. If it...

Hi, I need to get a precise linear oscillatory motion from a rotary input? Its for a compact carving tool. Any ideas on how to control the displacement? Thnks

Homework Statement As block B moves upward with constant speed 2 m/s, pin A glides through the semicircular slot. At the position shown, determine the velocity of A. a. 2.31, angle 60o b. 2.00, angle 60o c. 1.00, angle 0o d. 1.89, angle 30o Homework Equations Not sure The...

Homework Statement A ball is thrown vertically into the air and is caught 3.1 seconds later. (This is just a basic linear motion question, so there are no 'advanced' considerations.) a) Find the velocity when the ball was thrown b) Find the max heightHomework Equations (Nothing really...

Hi there, I'm not sure if I'm posting in the right place or not... So please forgive if I am. I did an experiment today on Uniformly Accelerated Linear Motion. We used an Atwood's type machine that used pressurized air to reduce friction. We also used photogates to time the movement of the...

Homework Statement A car is stopped at a red traffic light. At the instant the traffic light turns green, the car starts to move forward with a constant acceleration of 3.20 m/s2. At the same time as the light turns green, a truck traveling in the same direction with a constant speed of...

Hello, I have a laser beam that passes through two 3 degree angled wedges, resulting in the ability to project the laser anywhere within a 6cm radius circle (each wedge alone produces a 3cm radius circle). I need to be able to tell each wedge how much to rotate in order to get the laser from...

acceleration. linear motion. I'm stuck! Homework Statement a train moves at a velocity of 60 m s-1 and stops after a distance of 600m. what is its deceleration?Homework Equations v=s/t The Attempt at a Solution this is my working: u= 0 m s-1 v= 60 m s-1 s= 600 m v=s/t 60=600/t t=10 s ...and...

1st I am having problems getting a solution for final Velocity in terms of Distance traveled with a non-zero initial velocity. Acceleration = A / Velocity - B * Velocity^2 where A is a constant related to Hp (horsepower) of the vehicle and and B is a constant related to aerodynamic...

Homework Statement I have been asked to investigate whether Hollywood is scientifically accurate. I decided to use a clip from speed where the bus jumps that hole in the road. I have worked out the speed in m/s from the dial on the bus (67mph = 28.87m/s) and the distance from what the guy...

I am interested in how impulse turbines work. Supposing a mass of water (in kilograms), m, is expelled by a jet at a given velocity (in meters per second), v, its momentum (in Newton-seconds), p, is the product of these quantities: p = mv. Also, a paddlewheel’s angular momentum (in...

A ranger in a national park is driving at 28.0 mi/h when a deer jumps into the road 155 ft ahead of the vehicle. After a reaction time t, the ranger applies the brakes to produce an acceleration of a = -9.00 ft/s2. What is the maximum reaction time allowed if she is to avoid hitting the deer...

Homework Statement 2 linear motion problems hi i have 2 questions on linear motion that i could use some help on step by step. 1. Jules Verne in 1865 proposed sending men to the moon by firing a space capsule from a 220-m cannon with final velocity of 10.97 km/sec.. What would have been...

Homework Statement 2 linear motion problems -------------------------------------------------------------------------------- hi i have 2 questions on linear motion that i could use some help on step by step. 1. Jules Verne in 1865 proposed sending men to the moon by firing a space...

hi i have 2 questions on linear motion that i could use some help on step by step. 1. Jules Verne in 1865 proposed sending men to the moon by firing a space capsule from a 220-m cannon with final velocity of 10.97 km/sec.. What would have been the unrealistically large acceleration...

Homework Statement 1.Two runners accelerate from rest with the acceleration of runner A twice that of runner B. After accelerating for a given time, the speed of runner A will be twice that of runner B. is this right or wrong? 2.An ball is thrown vertically upward. At the top of its...

[SOLVED] linear motion Homework Statement Skiers leave a ski jump at 28 m/s, at an angle of 9.5 degrees below the horizontal. Their landing zone is a horizontal distance of 55 m from the end of the jumo The ground is contoured at that point so that the skiers trajectories make an...

i have a problem solving a linear motion question, this is the question two cars moving in a straight line of 70km with velocities 4.4m/s and the other 2.5m/s. when will they meet if a) they moved towards each other b) they moved in the same direction.

Homework Statement what is/are for a body to move in a straight line? Homework Equations The Attempt at a Solution

Homework Statement You adjust your garden hose nozzle for a hard stream of water. You point the nozzle vertically upward at a height of 1.5m above the ground. When you quickly move the nozzle away from the vertical, you hear the water striking the ground next to you for 2.0 s. What is the...

[SOLVED] linear motion Homework Statement A car enters a turn at 85 km/h, slows to 55 km/h, and emerges 28 s later at 35 degrees to its original motion, still moving at 55 km/h. What is the magnitude an direction of the average acceleration measure with respect to the car's original...

[SOLVED] Uniformly Accelerated Linear Motion Hello, I am attempting what looks to be a fairly easy problem involving uniform acceleration and linear motion, but my answers just aren't coming out right and I'm unable to see where I'm going wrong. Any help is appreciated. Homework Statement...

Linear Motion --Velocity and Acceleration Homework Statement [10] A toy car travels along a straight line. Its position x varies with time as shown on the x-t graph. The equation of motion in the A-C interval is given by x(t)=alpha+(beta)t^2+y(t)^(1/2) where alpha=1.0 m, beta=1.3 m/s^2...

[SOLVED] linear motion Homework Statement A bird is flying 30 m above a lake when it drops a fish. Another bird at 35 m immediatley dives and catches the fish before it hits the water. What is the initial velocity of the second bird? [b]2. Homework Equations h=h0 +...

According to a Scientific American article, current freeways can sustain about 2400 vehicles per lane per hour in smooth traffic flow at 96 km/h (60 mi/h). With more vehicles the traffic flow becomes "turbulent" (stop-and-go). a) If a vehicle is 4.6 m (15ft) long on the average, what is the...

A projectile is launched at an angle α from the edge of a cliff of height H above sea level. If it falls into the sea a distance D from the base of the cliff, prove that its maximum height above sea level is H + [(Dtan α)^2]/4(H + Dtan α) Newtons equations of linear motion in the i/j...

Hello, new poster here. I have trouble understanding some friction/resistance properties and how they are applied to rolling & linear motion simultaneously. I've done a lot of simple static / dynamic (sliding) friction examples as well as rolling without taking into account resistance, but...

Homework Statement So I suck at physics, especially when it comes to going from one thing to another, in this case Voltage and PE/KE to linear motion. Anyways here's the question, any hints as to how I should go about to solve it would be much appreciated A point charge of -10nC is at the...

1. Homework Statement A system consists off two small disks of masses m and 2m that are on a plane. The length that connects the two mass is of negligible mass is is 3L long. The rod is free to rotate on a vertical axis P and the mass 2m lies L away from P and the mass m lies 2L away from P...