Mathematics Stack Exchange
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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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Methods of Calculating Position

Suppose we have the following code (Euler Method?) to determine Position versus Velocity, Acceleration and Time: For Time := 1 to 10 Do begin Velocity := Velocity + Acceleration; Position := Position + Velocity; We end up by overshooting…
M-R
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question on codeforces problem

I was unable to solve this problem from a past programming contest I did. Since this is more of a math question than programming, I thought it best to ask it here instead of over at stackoverflow. In the explanation on the samples (see Note at the…
dcp
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Lorentz Transformation confusion

In my notes it says, when explaining an immediate consequence of the Lorentz Transformation: The significance of the parameter $v$ is seen as follows. Consider the origin of spatial coordinates $(x', y', z')' = (0, 0, 0)'$ in frame $F'$. From the…
Adam Rubinson
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Freefall with terminal velocity - expressions for velocity and position

A body weighing 29 kg is dropped from a height of 30 m with an initial velocity of 3m/sec. Assume that the air resistance is proportional to the velocity of the body. if the limiting velocity is known to be 39 m/sec, find: an expression for the…
Ivar Viilup
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Mechanics problem.

A bottle is dropped from a blimp whose height is 1200m. Assume that a= 9.81m/s/s, find the time it takes the bottle to reach the ground.
Abdullah
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2 Second Pendulum Length on The Moon

This was a physics bonus assignment. I have been trying to solve it for the last 2 hours. Let's say that the density of The Moon and The Earth are the same. Moon radius:Earth radius is $0.273:1$! How long does the pendulum have to be for the period…
Roberto Anić Banić
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How to calculate the force of tension?

"Three masses are connected by wires and hung vertically. Draw a Force Body Diagram for each mass and determine the tensions in the three wires." I know there are forces only in the y-direction, so I started by trying to calculate the force of…
Liz
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Help solving a Rectilinear Motion problem - straight roads

Problem: Amar drives 16 km directly west from Upper East Side to Central Park at a speed of 90 km/h, then directly south 8.0 km/h to 7th Avenue at a speed of 80 km/h, then finally 34 km southeast to Madison Avenue at a speed of 100 km/h. All the…
Jeansilvy
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The text for physics homework, is my interpetation correct?

The task goes as follows. When we get our drivers-permit we learn that the braking length grows proportional to the speed squared. (If we double the speed, the braking distance is quadrupled. Assume that the road is leveled and that the braking…
Algific
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$V_{RMS}$ with sinusoidal voltage source seems unintuitive

$V_{RMS}$ with sinusoidal voltage source is $V \sqrt2$. To me, it seems like the frequency should be involved somehow because that changes the shape of the wave. Is $\sqrt2$ somehow tied to the $\sin$ function?
uncle brad
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what is the position and acceleration at the instant when its velocity is zero?

The position of an object is given by $${x(t)= 2.17+4.80t^2-0.100t^6}$$ Would I have to take the derivative of that in order to find velocity? But from there how would I find the position and acceleration the instant velocity is zero? For time I…
Andrea
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Issues Calculating Average Acceleration?

So I'm doing a Physics problem here and I'm down to my last answer and I honestly can't figure out where I'm going wrong. The problem is as follows: From t = 0 to t = 4.22 min, a man stands still, and from t = 4.22 min to t = 8.44 min, he walks…
secondubly
  • 477
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Trouble converting $m^3$/hr to kg/sec

So I'm doing a physics problem on conversions, and having a bit of trouble with the intermediate steps (since I keep getting the wrong answers. The problem is as follows: Suppose that it takes 18.2 hours to drain a container of 76.0 $m^3$ of water.…
secondubly
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Find the maximum safe allowable bending moment.

A rolled steel universal I-section beam with a serial size of $406\times178$ has a mass of $60$kg/m. What is the maximum safe allowable bending moment this beam can sustain,given that the maximum allowable bending stress in tension and compression…
Flip
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How do I calculate the centripetal force?

In this experiment, a brown rubber weighs 42.2 grams and was spun at a velocity of 4.66m/s with a radius of 40cm and masses of 200g...the answer should be about 1.96N and I got 2.3. Can someone confirm or deny this?
exponential112
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