Movement Definition and 636 Threads

Homework Statement So basically this is a two part question, first part was find acceleration of the system (which i already found) with a coefficient of friction of 0.1. B) asks you what coefficient you need for the object not to move? Homework Equations The Attempt at a...

Consider a massive object moving close to the speed of light. Imagine it travels close to a black hole, but does not enter the black hole. How do you calculate the exact time dilation experienced by the massive object's reference frame? How does time dilation due to movement stack with...

Homework Statement From a height 40 meters up, one throw a ball with the velocity of 20 m/s. The elevation is 0°. How far does the ball come? vo = 20 m/s x = 40 meters α = 0° (g=9.82)Homework Equations y = v0 × t × sinα - (9.82×t2)/2 x= v0×t×cosα The Attempt at a Solution I put what I know...

a hevy piece of macinery(85kg) is being moved by elevator between floors in a building. Two identical small cranes are used. a cable connects each 'crane' to a mounting hook on the top of the piece of equipment. the cable from one crane is at an angle of 22degrees below the horizontal while the...

Off the Wikipedia: "...in a copper wire of cross-section 0.5 mm2, carrying a current of 5 A, the drift velocity of the electrons is on the order of a millimetre per second." Suppose we have a setup with a very very light wire which can transmit very very high currents. Once the current is...

In nature there doesn't exist perfect circular movement, yet you can always approximate what looks like a circular movement with a perfect one. My question is this: When a circular movement is not perfect, say an object has a tangetial velocity of v-ε in a radius where a velocity of v is...

This is nothing short of amazing. MIT figured out a way back in February to view how light 'moves' on, about and through objects. Here is a link: http://www.youtube.com/watch?v=snSIRJ2brEk&feature=related They apparently use multiple staggered high speed cameras to capture the images and...

For a particle to travel from point A to point B at the smallest scale, is there a distance in which the particle has to teleport since its shape doesn't change. Let's say the distance it travels is 0.0000000001, but the particle still need to travel that distance without it being 0.

If we wanted the rectangular plate to be able to move slowly up and down on the rods without binding, what would be an appropriate bearing to allow it to move smoothly on the rods?

Hello! I'm sorry if I'm posting this in the wrong section. I didn't know where else to put this. So here's the problem: Sometimes when I put a glass of water after drinking from it on my table (which also has a glass surface), the glass slides a little bit on its own. Sometimes it happens...

So I found this video, in witch it was said and explained that all movement should be impossible .. it was explained somehow like this (too bad i can not find the video now) : imagine a arrow (or bullet.. or anything else) shooting/ moving from start to its target - in order to get to the...

Hello, I have cool idea for a device and one hardest part of it is to detect the movement of the object. I think I can use a wire coil, and a small magnet attached to the moving object. When the object passes the wire coil (up or down), there will be small voltage inside the wire coil. It...

If I have a sphere at rest on top of a ramp, if friccion is negligible, the only forces acting on it would be gravity and the normal force. Both of these go through it's axis of rotation which would be the spheres center. What would cause the rotation then so τ≠0?

Apologies if this is the wrong topic, but I think it's relevant under GR since it involves curved space time and I can't see it applying to Newtonian systems. I found an article about swimming in space by deforming one's body. This should not be possible according to my understanding of...

Hello everyone! I am designing a sort of automatic spring gun to use with projectiles the size of normal tennis balls - sort of like a bowling machine. I have a horizontal spring, attached at one end to a square sheet of metal, and fixed at the other end. The square sheet of metal is...

Hello guys, how are you? Homework Statement An uniform solid sphere, that has 20mm of diameter and 8.4g of mass, its release at a inclined plane with 22cm of lenght. The inclined plane 'ends' in a table in which the ball starts to move horizontally. After leaving the table, that has 92cm of...

Hi everyone, I'm new to this site, so if I'm breaking any rules let me know. In particular because this is for my job. The forum rules seem very clear on the guidelines for homework for school and one can assume that personal hobbyist type questions aren't an issue but i don't see anything...

I am a curious (or perhaps bored!) fellow, and as such I noticed something peculiar recently. I was sitting in a car in a garage. The car was stationary and off, and it was facing the east. The sun was beginning to set in the west and a light shone through the back window shield. In the rays of...

Hi everyone! I find my way here on google frequently when I get some idea and want an answer, but I haven't been able to find any answers to a few questions I have. I hold no formal knowledge of astronomy or physics, so be understanding if my questions seem inane. I always find answers to my...

Hello, I have been trying to compute the velocity of the star with respect to its local medium from the proper motion measurements. Sure, you can calculate the corresponding velocities by v = 4.74*(proper motion)*distance (in suitable units), but this resulting velocity is now with respect to...

I'm a few days trying to get the direction of movement using an accelerometer. For my application I need to put an object on the table (z axis fixed) and detect the movements. I know perhaps the accelerometer is not the best sensor for this kind of application but is the sensor that is available...

Homework Statement In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at varying distances. Over what range must a lens of 45 mm focal length vary if the camera is to be able to focus on objects ranging in distance from...

The video, http://www.youtube.com/watch?v=XDCk0DaNwiQ&feature=results_video&playnext=1&list=PL28AFB6F1D7079B62 Observation of our chickens, when a chicken walks the head is kept motionless and then moves quickly to a new position, repeating over and over again as the chicken moves forward...

Hello there, I was not sure if this belonged in the Classical Physics forum or the General Physics forum, so my apologies if it's in the wrong place. This topic is part physics and part linguistics. An acquaintance (someone who has never studied beyond basic high school physics) recently...

Homework Statement A thin uniform rectangular sign hangs vertically above the door of a shop. The sign is hinged to a stationary horizontal rod along its top edge. The mass of the sign is 2.40 kg and its vertical dimension is 50.0 cm. The sign is swinging without friction, becoming a...

Homework Statement Hi guys. First of all, great forum you've got here. I have a problem and I hope you can help me with this one. Block of mass m lies on a rough horizontal surface. In the period 0 - t1, the block is moving due to the force F(t), which varies depending on the time. In...

Hello everyone, I made a problem where a shuttle travels to the moon the mine deuterium to fuse on earth, I started incredibly simplistic and I'm working my way up. At first I had the moon static, but now I have the moon moving at a constant radius and constant velocity. I have the shuttle move...

when a gun is fired a very large force acts on the bullet for a very short time. formula that's given: force x time = change in momentum (kg m/s) an average force of 4000 acts for 0.01 seconds on a bullet of 50g mass. DONE THIS PART b. the bullet is fired...

Mr Green, mass 80 kg, stepped off a boat of mass 35 kg at a speed of 3m/s. how fast did the boat move in the opposite direction? i have no idea how to work it out?

in a container there are some pistons of different areas. If we apply a force at one of the pistons and move it a distance. How can we determine the distance moved by the other pistons?

Say I am at point X. My friend, Gary, is 20m from X, and my friend Liam is 40m from X. Gary is traveling at 5 metres per second in a circle around me, remaining 20m from X. What speed must Liam travel at to appear, to me, to be traveling at the same speed as Gary? Is it 10 metres per second or...

Hey, I have a problem which I'm having trouble solving, it concerns the conservation of angular momentum. I am given a volume of water that is held behind dams in the mid-latitudes on the Earth and am asked to determine the change in length of the day due to the movement of the water into...

Homework Statement http://img833.imageshack.us/img833/9638/coisadovitor.jpg You have all the freedom to make any assumption to solve the problem. All 3 kinds of movement must be considered (roll, sway, heave). Variables are up to you. Homework Equations The Attempt at a...

or is space itseld quantized meaning an object moving from a to b would in some way look like A \/\/\/\/\0/\/\/\/ B or is it smooth and continuous like A--------0------B ?

Basically I was wondering if I was to place a magnet inside a tube sealed at both ends via two magnets (as the diagram shows) would the magnet keep on moving up and down or would it find a resting place. I think it would find a resting place but then I also thought there will also be gravity...

Hello Forum. I have two basic sound questions: I know sound (large wavelength) diffracts a lot when it exits an aperture. But if someone is speaking and he/she is not facing us we still hear them, even if we are in an empty field. Does sound diffract so much that it ends up even behind...

am not sure if i am asking it right, it appears to be very easy, but am un able to solve it... any help is highly appreciated..:) Ques: ihave a motor wuth these specs torque = 5 Nm no of revolution = 90 rpm radius of wheel mounted on motor shaft = 0.05 m i need to calculate the mass...

Homework Statement The figure shows a longitudinal wave moving to the right. Indicate the direction of motion of the points A and B Homework Equations The Attempt at a Solution How to determine the direction; either to the left or right? Thanks

Is it safe to say speed equals time? The faster in which everything moves internally and externally the faster time will flow by. Just as the moon circles the Earth or the Earth circles the sun. This is how we gauge time. It's not the trips around the Earth that are important, but the time...

Hey guys. Not a homework question. If two magnets have the same friction, same mass, etc. But have different strengths. and they are arranged so that they will repel each other, how will they move in relation to their starting points? Will they both move 1/2 the distance of the...

Homework Statement A muon has a lifetime of 2.2x10^-6 s when at rest, after which time it decays into other particles. a)ignore any effects of relativity discussed in this lesson, if the muon was moving at 0.99c how far would it travel before decaying into other particles, according to...

Homework Statement Imagine that you are flying on an airliner on a long flight to Europe at a constant speed of 300 m/s a) you throw a ball towards the back of the plane at 20 m/s. You then shine a beam of light towards the back of the plane. How will these two things-- the ball and...

Homework Statement I've been reading and I just want to make sure that this is the correct way which pv cells work, I feel this is not correct. I want to find where I am wrong. Once the p and n doped semiconductors are put together some carriers migrate and combine to form a depletion zone...

howdy : I'm new to this site and i have not used a forum before so this is probably going to be stupid . if so ---sorry . anyway if i have a metal magnet (ie neodymium) connected to the positive of a high voltage source and a metal pin connected to the negative of the high voltage source with it...

Could we harness energy from Earth movement relative to physical vacuum? Earth is moving around Sun with speed of 30 km/sec. Also there exist force of Casimir and similar effects. If we have some body (for example a ball) which is moving in some media (for example water) then to harness...

This is a problem I've been looking to solve for some time. Homework Statement You must find a movement equation for an object in a gravitational field knowing traditional formulas of force and acceleration of gravity (see below).Homework Equations absolute value of the acceleration at a...

Homework Statement An electron is fired at 4.0x106 m/s horizontally between the parallel plates as shown, (see diagram) starting at the negative plate. The electron deflects downwards and strikes the bottom plate. The magnitude of the electric field between the plates is 4.0 x102 N/C. The...

My textbook says electrolytes conduct electricity by the Movement of positive and negative ions. I have always thought it was due to the movement Of free electrons but it isn't so . Why is this so ? I have visited a few websites but am unable to reach an answer . By the way, when we say ionic...

the problem is with b. and c. but I would like verification on a if possible, thanks! Homework Statement A cabin lays on a smooth track (so friction can be disregarded) the wind exerts a pushing force F=\gamma u u is the relative velocity between the cabin and the wind. the wind's velocity is...

when something is moving at the same velocity as you, it appears to not be moving. then if something is aging at the same "rate" as you, wouldn't it appear to be frozen in time? consider special relativity: is it fair to say that at either extreme you basically are either traveling through space...