Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [physics]

Questions on the mathematics required to solve problems in physics. For questions from the field of mathematical physics use (mathematical-physics) tag instead.

This tag is for questions on the mathematics required to solve problems in physics and should not be confused with those on physics concepts. Pure physics questions should go in the Physics Stack Exchange. For questions in the field of mathematical physics, please use the tag instead.

5951 questions
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Physical meaning and significance of third derivative of a function

Given a physical quantity represented by a function $f(t,x)$ what is (if there is any) the actual meaning of the third derivative of $f$, $\frac{\partial^3 f}{\partial t^3}$ or $\frac{\partial^3 f}{\partial x^3}$
HassanB
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Formula for Planetposition

I am looking for a simple formula x(t) to calculate the position of a planet. Simple means, the planet is moving on a two dimensional plane following the curve of an ellipse. My problem is not the curve of an ellipse. Its to calculate at what time…
testo
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Torque/moment calculation to size a linear actuator.

I am attempting to size a linear actuator (check that the rated torque will be enough to open a damper). My damper is a circular plate that has a mass of 20kg. It will pivot about one side of the plate (not through the vertical centreline of the…
this guy123
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Simultaneous motion equation

A car travels in a straight line. Taking: 15 seconds to travel 220m And 10 seconds to travel the next 220m. What is the acceleration. (Acceleration is constant) I have tried using motion equations to simultaneously solve the question, but seem to be…
user888469
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How are the values for velocity and mass found?

I'm confused as to how and where the solutions have derived the mass and velocity of A and B in this question. If someone could help me understand, that would be great.
KPC2
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Percentage of volume of object above water

I'm having difficulty proving that the percentage of the volume of an object above the surface of a liquid is $$\frac{100(p_f-p_o)}{p_f}$$ given that buoyant force exerted by the liquid on the object is $$F=p_fg\int_{-h}^0A(y)dy$$ where $A(y)$ is…
Anson Pang
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How do I find the coefficient of friction when given velocity, distance, and mass?

A skier, moving at 8m/s, slides to a stop on a level surface while moving 64m. Assuming her mass to be 60kg, what is the coefficient of friction between her skies and the snow?
Kusuo Saiki
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How much force needed to keep this together?

Let's consider the following situation: There are 3 identical cylinders each with a weight of 20 tons. The 3rd one is put over the other 2 like in the picture (but the bottom 2 do touch each other). The 2 bottom ones are on the floor, on Earth in…
Overmind
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How to determine what direction an object will orbit another object.

In this universe lets say everything exists in a 2d plane. There exists a 2d planet and hurdling towards it (at some velocity), is a 2d asteroid. Luckily, the asteroid isn't going to collide with the planet, however, the asteroid is going to get…
Gary Holiday
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Physic: Calculated Waterflow based on Power generation of turbine

I have a turbine which produces 50MW, the water falls down from three meters height. How much water does flow per second? Please do not answer this question, but rather give an explanation how I can calculate it myself.
Tim
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Physics Problem Involving Trap Door Supported by Rope

A uniform trapdoor shown below is 1.0 m by 1.5 m and weighs 300 N. It is supported by a single hinge (H), and by a light rope tied between the middle of the door and the floor. The door is held at the position shown, where its slab makes a 30 degree…
Kian Nikzad
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What shape is a lens?

(I'm not entirely sure whether this should go here on on the Physics stack exchange. Tell me if I'm wrong :)) To my understanding a lens can be made by intersecting two spheres. This causes spherical abberation though, and a better aspheric lens can…
Zac
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Find max value from two known points and the average value of all points

From an unknown number of points, I have two points, e.g. (0,105) and (100,108). I also know the average, e.g. 110, of all the unknown and known points. Would it be possible to estimate a maximum value of the points, using only the two known points…
andreasj93
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Solve Max Velocity given Distance, Time, Initial velocity, Acceleration, Deceleration

For a motor application I wan't to be able to find the maximum velocity I should ask my motor to use knowing: Distance to go D Time to travel T Acceleration a Deceleration d Initial velocity v0 So that my motor will go from initial position p0…
I33N
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For a game I am working on. How long will a cannon shot take to hit the ground?

In this situation the cannon is being shot towards the ground from a blimp (fantasy situation) . Blimp's speed is 35 mph. Blimp's cruising ceiling is 8000 ft. Standard Civil War cannonball was 12 lbs (5.4 kg). The shot speed is 250 miles per hour…
Drew Hally
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