Acceleration Definition and 1000 Threads

kuruman submitted a new PF Insights post Frames of Reference: Linear Acceleration View Continue reading the Original PF Insights Post.

Hey guys, I'm going to say right up front that I haven't a clue how to do these calculations, but I have a scenario that I would like the math to if anyone can help me figure it out. What I had been able to attempt to figure out doesn't seem tangible? The formulas I had researched/used was...

Hello, I'm making a tube uncoiler and I'm trying to find the acceleration of the tube at the reel (a3) can someone help me with this. kind regards, P-J

1. The problem statement, all variables, and given/known data Joe is painting the floor of his basement using a paint roller. A roller has a mass of 2.4kg and a radius of 3.8cm. In rolling the roller across the floor, Joe applies a force F= 16N at an angle of 35 degrees. What is the magnitude if...

Hi everyone, My roommate and I were talking about which would win in a short downhill race (with no pedaling from either rider), a bike or a skateboard. Assuming the bike stays in the same gear (2, and 4), and has a wheel diameter of 27", and the skateboard has a wheel diameter of 2.4". My...

Homework Statement an object starts from rest and has a final angular velocity of 6 rad/s. the object makes 2 complete revolutions. find the object's angular acceleration. Homework Equations wf^2=wi^2+2αd The Attempt at a Solution Not sure what to do with the revolutions, would it take act as...

Charles Link submitted a new PF Insights post Frenet Equations in 2-d Which Result in the Cornu Spiral Continue reading the Original PF Insights Post.

In my textbook.In some question gives me angular speed as ( )rev/s.I know that its the frequency (f).But some questions It says angular velocity and says rad/s. Interesting thing happens when the textbook says in angular speed and I use f and then using w=2πf and then continue I get wrong...

Homework Statement A mass of 0.5 kg is suspended from a flywheel as shown in FIGURE 2. If the mass is released from rest and falls a distance of 0.5 m in 1.5 s. Mass of wheel: 3kg Outside rad. of gyration of wheel: 300mm Radius of gyration: 212mm calculate: (a) The linear acceleration of the...

1. A car is traveling 9m/s Northwest. 8 seconds later it has rounded a corner and is now heading North at 15m/s. This was a question from my textbook and was an example question - so they supplied answers. I was able to work through all of it finding everything except the last question. They...

Homework Statement “A bicycle wheel is mounted as in the lab and as shown to the right. This wheel has a mass of 6.55 kg, a radius of R = 38.0 cm, and is in the shape of a ring. A mass M = 1.85 kg is attached to the end of a string which is wrapped around an inner hub which has a radius r =...

Homework Statement A car starts at rest at point A, with a tangential component of acceleration a_t = 0.6m/s^2. Students approximate the acceleration of the car to be 0.6 m/s^2. What are the normal and tangential components of it's speed and acceleration at point B? NOTE : the ends are...

Homework Statement At t = 0, one toy car is set rolling on a straight track with initial position 16.0 cm, initial velocity -3.7 cm/s, and constant acceleration 2.90 cm/s2. At the same moment, another toy car is set rolling on an adjacent track with initial position 10.0 cm, an initial velocity...

1. Can a fluid which is accelerating down an inclined channel with constant acceleration still satisfy the continuity equation for a constant-density fluid? Since the acceleration will be down the slope, in the streamwise direction, then surely ∇⋅U > 0? 2. Assuming that continuity is satisfied...

Homework Statement The problem asks for the tangential and normal acceleration of the acceleration. We were given that: $$a_x=c*cos[d*t]$$ and $$a_y=c*sin[d*t]$$ where c and d are constants. Homework Equations The book gives us $$a_t=(r\ddot{\theta}+2\dot{r}\dot{\theta})$$, (1)...

I would be very grateful for help with deriving the following equation... "A smooth fixed plane is inclined at 30 degrees to the horizontal. A wedge of mass M and angle 30 degrees is held on the surface so that its upper face is horizontal, and a particle of mass m rests on this face. The...

Homework Statement "The fastest measured pitched baseball left the pitcher's hand at the speed of 45 m/s. If the pitcher was in contact with the ball over a distance of 1.50m and produced constant acceleration, (a) what acceleration did he give the ball, and (b) how much time did it take him to...

This question came to mind from the thread... https://www.physicsforums.com/threads/can-a-photon-be-accelerated.901484/ Knowing... 1) Strong gravitational fields create strong curves in spacetime 2) Light traveling through strong gravitational fields get curved along the spacetime 3)...

1. A ship is launched into the water down a ramp making an angle of 8 degrees with the horizontal. The coefficient of kinetic friction between the bottom of the ship and the ramp is μk=0.06. What is the acceleration of the ship down the ramp?2. I know that the equation to solve this is a =...

Homework Statement A stone is dropped from the top of a tall building. It accelerates at a rate of 9.81m/s^2. How long will the stone take to pass a window that is 2.0m high, if the top of the window is 20.0m below the point from which the stone was dropped? I've already solved the initial...

Homework Statement A ball of mass m is given an initial velocity ⃗v and entered into a funnel. Model the acceleration of the ball over a period of time. Note: I don't have a full problem statement because this isn't really a homework question (but I figured it was homework-like enough to post...

Homework Statement A man was driving a car at 78 km/h, he saw a deer at the distance of 101m, how much time is needed so that the car slows down after it drove 99m and stops. Homework Equations Δx = 1/2 (vi + vf) * t The Attempt at a Solution I'm thinking about finding the Δx

Homework Statement [/B] A thin, uniform, 3.8kg bar, 80cm long has two 2.5 kg balls glued on at either end. It is supported horizontally by a thin, horizontal, frictionless axle passing through its centers and perpendicular to the bar. Suddenly the right hand ball becomes detached and falls off...

Homework Statement Homework EquationsThe Attempt at a Solution Since at N the gravity is now heading down towards the person in a positive direction it's acceleration is G, where as velocity goes up then comes down towards the person so it's velocity is now negative, thus -V, but the correct...

Homework Statement ##m=1[kg]##, ##M=5[kg]##, ##u=0.6## Calculate the minimum force required for the blocks to remain in the same position thourought the motion. For the part a) there is no friction between block 2 and the floor, for the part b there is and its ##u_f## Homework Equations 3...

Homework Statement Homework Equations F=ma The Attempt at a Solution I know it's either B or D Weight = mg so let's say mass of ball is 11kg and gravity on moon is 6, so weight would be 66N since acceleration a = F/m and we can say that F=mg therefore a = mg / m which leaves: a=g and...

Firstly I must say if this is in a wrong sub-forum I apologise. This is my first post and I'm new to the website so please bare with me. Also I was unsure of the Prefix so I again apologise if that to, was incorrect. But my Question is that is the acceleration (or deceleration) of an object...

Homework Statement A bascketball player , who has a weight of 890 N , jumps vertically with a height of 1.2 m , 1- Find his speed when he left the floor. 2- If the time that takes the basketball player to quit the floor is 0.3 s, what is his average acceleration ? (I don't understand this...

Homework Statement A 12 kg meteor experiences an acceleration of 7.2 m/s2, when falling towards the earth. a) How high above the earth’s surface is the meteor? 1.06x10^6 b) What force will a 30 kg meteor experience at the same altitude? 216 NHomework Equations I was comparing...

Homework Statement A record player rotates normally at a rate of 18 rev/m. It takes 70 seconds for it to slow down to a stop when you turn it off. Homework Equations Calculate the magnitude of its angular acceleration. The Attempt at a Solution answer key says the correct answer should be...

Homework Statement Two bodies are standing still upon a surface without friction. The mass of body 1 is bigger than the mass of body 2. i) A constant force is applied to body 1, so it accelerates in a segment to a distance d. The force stops being applied to body 1, and is applied to body 2...

I am coding a game in which I desire a projectile to undergo realistic curving when rotating while moving through the air. Let's consider the instance of a projectile that is initially moving forward while spinning clockwise along an axis placed vertically in it is center of mass. The object...

Homework Statement For the mechanism shown, determine the speed and magnitude of the acceleration of collar C in terms of b, θ, θ-dot, and θ-dot-dot. Check the attached file for the diagram. We are given the length b and angle θ. Homework Equations ΣF=ma The Attempt at a Solution I...

For Q11(b), what is the relation between the angular acceleration ##\alpha## of the bottom right cylinder and its horizontal acceleration ##a_x##? I get ##\alpha=\frac{a_x}{\sqrt{3}R}##, which is half the given answer (7.84) below. After the bottom right cylinder rolls around the top cylinder...

hello, I'm new here according to this scheme: i would to know, if the pressure is constant, the spring displacement in the moving part in function of time. the square is without mass, so i thought to use the energy approach, but i don't know how to consider acceleration

Homework Statement To lower himself from a balcony an 80kg stuntman grabs a rope connected to a 400kg cylinder with a 1.2m diameter that is free to rotate about its axis of symmetry. What is the stuntman's acceleration as he falls? Homework Equations I missed this on a homework assignment. I...

Homework Statement :[/B] A mass is moving with constant acceleration in the x-y plane. At time t = 0s the mass’s position is 2mˆı+3mjˆ, the mass’s velocity is 3 m/s ˆı −4 m / s jˆ and the mass is subject to an acceleration of 1 m/ s ^2 ˆı + 1 m/ s^ 2 i jˆ. At what time is the velocity...

Hi, There is a mass that sits on a bridge between 2 parallel actuator (2 axis gantry), and slides on linear guides. If the mass is not centred, and close to one side of the drives, would that require that 1 of the actuators to put out more force? or would it always be even? I figure you might...

Homework Statement This is not a particular problem but a generic one. If one has acceleration stated in terms of velocity (or position) such as a=v, how do we convert these values into time? Homework Equations ads=vdv ad(theta)=wdw And of course, the usual time-based derivative relations...

Homework Statement A particle flies along in the positive +x direction. It has a constant force F applied 30º clockwise to the x-axis. It is moving at .6 c. What is the angle of acceleration? Homework Equations a = F/(mγ3) The Attempt at a Solution [/B] I'm pretty sure I know how to do...

Homework Statement A yo-yo consists of two cylinders with radius ##R##, mass ##M## and height ##H## connected by a smaller cylinder of radius ##r##, mass ##m## and height ##h##. Determine the yo-yo's acceleration in ##z##-direction, using its moment of inertia. Homework Equations Moment of...

Homework Statement The functions are given: ##r(t)=pe^{kt}## ##\theta (t)=kt## ##v(r)=\sqrt2kr## ##a(t)=2k^2r## Find the radius of the curvature of the trajectory in the function of ##r## Homework Equations $$R=\frac{(\dot x^2 + \dot y^2)^{3/2}}{(\dot x\ddot y - \ddot x\dot y)}$$ There is also...

Homework Statement A baseball is thrown straight up with a speed of 25 m/s. Determine: (a) The maximum height reached by the ball (b) How long it takes the ball to reach its maximum height (c)The time it takes for the ball to reach a velocity of 5m/s (down) (d) The speed of the ball when it...

Mods, I wasn't sure whether to put this in quantum physics or relativity, but since the speed of light is the limiting factor I chose here. Move wherever you think is best. Okay so the speed of light is the asymptote for the speed that objects can accelerate to, and the Planck time is the...

Homework Statement Find the acceleration of each object. Note: the question mark in the diagram should be θ (angle of inclined plane) 2. Homework Equations τ = F . r Στ = I . α α = a / R ΣF = m . aThe Attempt at a Solution For object A: ΣF = m . a TA - WA sin θ = mA . aA TA - mA . g. sin θ...

Homework Statement 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) 48.40 | 9.100 49.80 | 17.479 51.20 | 32.816 Calculate the magnitude of the acceleration at t=49.80 s...

Homework Statement To save fuel, some truck drivers try to maintain a constant speed when possible. A truck traveling at 28.0 km/hr approaches a car stopped at the red light. When the truck is 110.7 meters from the car the light turns green and the car immediately begins to accelerate at 3.8...

Homework Statement m1 is on a frictionless surface and m2 is on a surface with a coefficient of friction of μ. Find the acceleration of the blocks in terms of m1, m2, g, Ѳ, μ Homework Equations ΣF=a*m The Attempt at a Solution a=m2gsinѲ/m1+m2 is this correct??

I have a little doubt to get cleared. Gravity of the Earth causes an acceleration of 9.8 m/s2 which increases the velocity of a body at free fall. So for a very massive body like a black hole FOR INSTANCE, the acceleration due to gravity on a body will be very high, right? So if a body falls...