Urgent Definition and 367 Threads

Urgent help needed on physics problem! A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.40 s later. What is the rocket's acceleration? I have less than an hour to answer this...

Vector Problem URGENT Two vectors A and B have precisly equal magnitudes. In order for the magnitude of A +B to be larger then the magnitude of A - B by the factor n, what must be the anle between them? There is the question i need help on this quickly thank you for nehelp i know u have to...

Please help me with this question! I understand the concepts of potential difference and charge etc but i don't understand what to do with the velocity. 1) In a lightning flash, the potential difference between the cloud and the ground is 1.0 x 10exp9 V and the quantity of charge transferred is...

Hi there! My name is Lisa, and I live in the Netherlands (where school has already begun 2 weeks ago ). I have a pretty urgent question concerning a physics project. I need to think of a certain construction which launches an arrow/ dart arrow / marble from a variable angle. It's very...

Hi! I have a physics problem that I just don't understand. It is as follows: Imagine that you are in an elevator with a tank of water and three goldfish. A device in the gravel (of the fish tank) measures gauge pressure at the bottom at the tank. (a) Suppose it reads 4000 N / m² with the...

Two rods, one of aluminum and the other of copper, are joined end to end. The cross-sectional area of each is 4.0 x 10^-4 m^2, and the length of each is 0.040m. The free end of the aluminum rod is kept at 302 degrees Celsius, while the free end of the copper rod is kept at 25 degrees Celsius...

Our problem is that we measured the rate of change of pressure of a liquid at different length of a pipe, for example, x=0, x=5cm, ... etc, caused by a pump at x=0-15cm=-15cm and got a result that at x=0, dP1/dt1 = -dP2/dt2, where dP1 is the pressure difference over a fixed interval, del t1, and...

Hopefully someone here knows what I'm talking about, but here it goes. I'm doing my leaving cert applied maths paper in 2 days time, and I'm stuck on this question. I can't follow the solution available on the internet, so i need someone to go through it step by step. Its Q7 in the paper...

Please I know that this question has ben asked many times, but I really need to get an answer on it. It's urgent. Is the universe finite or infinite ? If there is another thread discussing the question, please post the link. Also any other link poiting to a relevant website is...

Question : A wall is placed in the middle of the room (not those thick walls but regular thin walls). And an object is continuously hitting it with a constant force. Physicists believe that if it keeps hitting the wall with a constant force, the atoms at that particular place on the wall will...

Urgent- Physics coursework on sensing (OCR B) The coursework is on using sound waves to measure the depth of water in a tank. I emit soundwaves using a sound generator and pick of the reflected wave with a mic. The original wave and the reflected wave are then shown on a osiliscope. I then need...

An infinitely long thin wire carrying a constant I is located along 0z-axis while a rectangular loop of dimensions axb located in the plane 0yz moves parallel to the 0y-axis with a constant velocity v. Assuming the two of the edges of the loop are parallel to 0z, compute the emf's induced on...

Greetings physics wizzes! I am trying to find out what time the new moon reaches it's apex tonight. This is probably the most elementary task but I'm fairly clueless when it comes to this stuff. Any help would be greatly appreciated, Thanks.

http://www.myimgs.com/data/Cyto/Physics.jpg The ramp and the ledge which the box sits on is has a Mu(k) of 0... the spring compression of the block when released from rest is 98cm... i found the height of the ramp being 29m, and the speed at the top of the ramp being 11.8.. i just need help...

1. Does a graph of force of friction vs force normal pass through the origin? Explain. 2. Does the force of kinetic friction depend on the weight of the object? Explain. 3. Does the coefficient of kinetic friction depend on the weight of the object? explain This is not on an icline plane.

My good friend's wife is dying of cancer. She has "final stage, inflammatory, breast cancer", or something like that. I need whatever information (perhaps some links or references) anyone has on the possible cures (particularly something "natural"). Also, does anyone have information on...

Here is a question that is giving me fits. An electron is trapped in an infinite quantum well. If the lowest energy transition is to produce a photon of 450nm-wavelength, what should be the well's width? Any help is appreciated. :)