Accleration Definition and 78 Threads

The photo above is the problem I'm struggling now and the photo below is what I have done so far. By differentiating and integrating the given equation, which is F=-b exp(αv), I tried to express v(t) or a(t) as a function related to t, which is time. But the more I did, the more complicated...

Hello, all - A question has come back to tickle my brain. Could a vehicle with less than 1G of thrust manage to escape the Earth's gravity well? I'm thinking something like Space X's Falcon 9. As it landed, with just a little more thrust, it could go back up again, I would guess. So, if it...

I am trying to create a lever which has mass on one end and i need to lift the lever. A picture showing the lever setup is in this link: https://imgur.com/WeH4oK7 The system is like seesaw ( from -20 degrees to +20 degrees at constant angular velocity for time period 't') The input angular...

General physics question regarding force and gravity. Hypothetically speaking if every piece of mass weighed double. If something that weighed 1 Pound is now 2 pounds. If you weigh 100 pounds now you weigh 200 pounds . Assume gravity is still 9.8ms/sq. and you never experience gravity any...

Homework Statement Hi, I did an experiment where I launched a soccer ball into projectile motion with my hand and took a video the situation. I uploaded it into the Tracker software to analyze it. The tracker software gave me a x-t graph, a y-t graph, and a y-x graph. From the y-t graph...

Homework Statement A person jumps from the roof of a house 4.2-mhigh. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.66 m . If the mass of his torso (excluding legs) is 43 kg , find the magnitude of the average force exerted...

Homework Statement The acceleration amplitude of a damped harmonic oscillator is given by $$A_{acc}(\omega) = \frac{QF_o}{m} \frac{\omega}{\omega _o} \sqrt{\it{R}(\omega)}$$ Show that as ##\lim_{\omega\to\infty}, A_{acc}(\omega) = \frac{F_o}{m}## Homework Equations $$\it{R}(\omega) =...

I have been through following papers for research: 1)http://cdsads.u-strasbg.fr/cgi-bin/nph-iarticle_query?1990ApJ...362..584M&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf 2)https://arxiv.org/pdf/gr-qc/9905054.pdf Conclusion of the second paper given above...

1. Homework Statement 3 blocks A,B and C are attached between them by massless and frictionless strings , that passes through frictionless , massless pullies , the blocks A and B have the same weight 25 N and the same coefficient of kinetic friction 0.35 , the bloc C goes down with a constant...

Homework Statement A particle at rest undergoes an acceleration of 2.7 m/s2 to the right and 4.3 m/s2 up. -What is its speed after 6.8 s? -What is its direction with respect to the horizontal at this time? -Answer between −180◦ and +180◦ . -Answer in units of ◦ . Homework EquationsThe...

Homework Statement A car has a performance of 10,705 miles per gallon. If the car is given 100 grams of ethanol (Standard Gravity = 0.789) and drive until the fuel runs out, how far with they go in meters?Homework Equations Standard Gravity = Density of the Object /Density of Water Density =...

*Neglect the friction between the car and the earth, but not the friction between the stuff inside the car & the interior surface of the car* For example, if we're moving with a car at constant speed and we used the brake to stop with constant acceleration, and the stuff inside the car included...

I saw this problem in my dynamics class: http://d2vlcm61l7u1fs.cloudfront.net/media%2Fa22%2Fa2261e7a-0e85-45e7-8b63-f23157d623bc%2Fphp37ql1a.png I know how to solve it, but I don't understand why A(bd) has both a normal and tangential component to acceleration. If it is rotating at a constant...

Homework Statement He decelerates uniformly at a rate of -5.00m/s^2 over from a velocity of 7.5m/s to rest. Find the time and displacement. Homework Equations Vf^2=Vo^2 + 2a(displacement) The Attempt at a Solution 0=56.25+2(-5)x is this the right way to find displacement? Solving for the x...

Homework Statement A particle of mass m is whirled on the end of a string of length R. The motion is in vertical plane in Earth's gravitational field . The instantaneous speed is v when the string makes angle Ө with the horizontal. Find the tension T in the string and the tangential...

Let's say we are on Earth-like planet, but without an athmosphere. There's a rocket on the ground and it's starting now. The rocket accelerates but at a point when it has enough speed it stops accelerating. The rocket has still enough speed to get further away from the planet but not enough to...

How would you go about proving that centripetal F=(mv^2)/r by diagramming and solving for the magnitude of the forces in the x and y direction? For example, suppose I wanted to calculate the work done in the radial direction by centripetal force.

Hello, F=G m1.m2/r^2 whereas g=Gm/r^2 Now, I found reading that, the Mass of Earth, radius from the center r and obviously the gravitational constant is always constant and hence is grouped under a single constant 'g'. Hence: F=mg, where g=GM/r^2 Now, while calculating gravitation...

My physics problem ask me to find the average acceleration on a velocity time graph. On the graph, velocity is at -6 constantly from 0 - 5 s. I know that an question to use would be average accerlation = delta v/ delta t The problem is I did that and I still got it incorrect on...

Taking high school physics, i have learned that force and acceleration are vectors. But i have noticed prior to this, we have never worried about them as such. Most of the problems simply treat them like any other measurment or value, ignoring direction. Almost like scalars. So my question...

Homework Statement The problem states to find the maximum acceleration and velocity, the accleration and velocity when the displacement (x) is 1.00cm, and the equation of motion as a function of time if the displacement is A (amplitude) at t=0. We're given that the period (T) is 0.500s and...

Homework Statement A horizontal string tied at both ends is vibrating in its fundamental mode. The traveling waves have speed , frequency , amplitude , and wavelength . Calculate the maximum transverse velocity of the point located at lambda/4. Calculate the maximum transverse acceleration...

Lets say I have a uniformly charged spherical shell. that is roating with an angular velocity w. Now machs principle says that accleration is relative to the distant stars. If the distant stars are rotatingng with the same w as the spherical shell, there will be no B field inside the shell...

How would I go about solving a problem like this? What would the answer be? Homework Statement Rockets A and B are fired straight upward from rest at the same time. Rocket A accelerates at 12.2 m/s2, while rocket B accelerates at 15.9 m/s2. Solve for the moment in time when the rockets are...

Homework Statement I don't need help with a homework question so much as a clarification of a concept. I realize that in projectile motion on a horizontal plane, horizontal acceleration is 0. But if an object is launched from the top of an incline (shaped like \), there is both an acceleration...

Homework Statement 1.A basketball player, standing near the basket to grab a rebound, jumps 74.7 cm vertically. A) How much time does the player spend in the top 10.6 cm of his jump? B)How much time does the player spend in the bottom 10.6 cm of the jump? Homework Equations 1)v=v0 + at...

[b]1. Two basketball players collide. Player 1, with a mass of 55.0 kg, experiences a -15.6 m/s2 acceleration. If player 2 has a mass of 48.5 kg, what acceleration did he experience immediately following the collision? Homework Equations F=ma I am doing a correspondance course and...

Hello everybody.. I am stuck with a question here. I have to estimate time for an electric supercharger to reach from 40-120k rpm. Impeller inertia is negligible. Max torque=2 Nm, bearing drag profile=0.001 Nm/krpm, diameter=30mm, Lenght=100mm Shaft is solid steel with density =7.85 kg/cm3...

1. An 18 wheeler and a sports car in adjacent lanes at any given moment. If the car's speed is faster than the trucks speed, which of the following must be true about the car's velocity... a) its increasing b) its in the direction of the truck c) its zero d) none of the above I said it...

Homework Statement Homework Equations a= F/m F= mgsinθ-Ffr Ffr = \mumgcosθ d= 1/2gt^2 The Attempt at a Solution a = (m1gsinθ+m2gsinθ)-(\mum1gcosθ+\mum2gcosθ)/(m1+m2) a = 3.72 m/s^2 t = 1.03s I need someone to verify if this is correct, no anwser key was provided...

Homework Statement A 593 N physics student stands on a bathroom scale in an 875 kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 424 N. A. Find the magnitude of the acceleration of the elevator. B. What is the acceleration if the...

Homework Statement Figure 7-39 (attached) gives the acceleration of a 3.0 kg particle as an applied force moves it from rest along an x-axis from x = 0 to x = 9.0 m. The scale of the figure's vertical axis is set by as = 8.0 m/s2. How much work has the force done on the particle when the...

An athlete (mass of 50 kg) is moving with a constant velocity of 5ms. Determine the resultant force acting on him. If it's a constant velocity he is not acclerating? Therefore a = 0 m/s/s; F=ma F=50 X 0 = 0N? But there has to be a force dosent there? Would the force be equal to the mass...

Homework Statement I need help on this homework problem I can't seem to figure it out. A objects constant acceleration is north at 40 m/s^2. At time 0 its velocity vector is 15 m/s west at what time will the magnitude of the velocity be 30 m/s? Homework Equations This is the eq i...

How is tangential accleration zero in uniform circular motion?? Homework Statement the magnitude of tangential velocity is same but the directions are different..so how can the tangential acceleration be zero?? Homework Equations The Attempt at a Solution

Is it possible that for two very large objects (like the Earth and the moon), brought close together, the resultant accleration could be the combination of both their gravitational fields? We know for less massive objects accleration due to gravity (on Earth) is apparently constant at...

Homework Statement A baseball traveling horizontally at 41m/s [S] is hit by a baseball bat, causing its velocity to become 47 m/s [N]. The ball is in contact with the bat for 1.9 ms, and undergoes constant acceleration during this interval. What is that acceleration?Homework Equations V2 = v1...

I just have a question based on a toroidal conductor. I know that the magnetic field would run in a circle (http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/imgmag/tor.gif). I am wondering if that magnetic field would do anything. For example, if I dropped something charged into there, would...

Ok, I have a a motor, so I know the speed in rev/s. The motor is going to power a wheel, so I have a second moment of area?, (I), and I want to calculate the torque. I know I can do this by using T=I*\alpha. The speed of the motor is 2500 revolutions per second. So \omega is 2\pif, which is...

Hi guys, Sorry I am not into physics that much, basically I am a software developer..., my question might be silly., but, I want to calculate distance between two points. The situation here is - if an object is moved from say point x to point y in t amount of time with an acceleration...

I came across an article on the net which stated that in 1881 J.J. Thomson realized that a charged particle was more resistant to accleration than an identical neutral particle. I would like to know how Thomson came to this conclusion, was it determined by experiment or mathematically, also...

Homework Statement A car traveling at 25m/s strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.72 m. What was the average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00g = 9.80 m/s2...

Homework Statement When searching for gold, measurements of g can be used find regions within the Earth where the density is larger than that of normal soil. Such measurements can also be used to find regions in which the density of the Earth is smaller than normal soil; such regions might...

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Homework Statement An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.95 m/s . The rock falls through a vertical distance of 1.10 meters and lands a horizontal distance of 8.85 meters from the astronaut. Homework Equations The Attempt at a Solution ΔX...

hi, could some on help me understand why the following is true? for some of them i wrote exactly what i don't understand, for others i really have no idea Two uniform rods are connected to a table by pivots at one end. Rod B is longer than rod A. Both are released simultaneously from an...

revered members, if velocity is constant acceleration is zero. now my question is if a vehicle moving with constant velocity, say a train, has constant velocity, so acceleration is zero. now if that train hits a person, why that person gets hurt, inspite of acceleration is zero? my son asked...

Homework Statement A motorcycle has an initial velocity of 8m/s, it increases it's speed to 17m/s, covering a distance of 30m in that time. What is it's accleration? How long will it take to acclerate to 17m/s? Homework Equations As stated in the equation The Attempt at a...

Homework Statement A rope exerts a constant horiztonal force of 250N to pull a 60kg crate across the floor. The velocity of the crate is observed to increase from 1m/s to 3m/s in a time of 2 seconds under the influence of this force and the frictional force exerted by the floor on the crate...

Homework Statement There is no friction Part A) Find the mass of block C so that block B moves up the incline with a constant speed Part B) fint he mass of block C so that Block B moves up the incline with a constant accleration a = g/2 Homework Equations The Attempt at a...