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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Updating average speed with latest observation of distance and time

Suppose I've traveled a cumulative distance $D$= 39.190 meters in time $T$ = 2.00 secs. My average speed is then simply: $$ S = \frac{D}{T} = \frac{39.190\ m}{2.00\ sec} = 19.595\ \frac{m}{sec}. $$ Suppose in the next observation interval, I go $d$…
stackoverflowuser2010
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working out angular velocity

the chain on a chainsaw is driven by a sprocket 8cm in diameter. If the chain is 120cm long and makes one revolution in 0.2sec, what is the angular velocity (in rad/sec) of the sprocket? I was working with, the sprocket circumference is 25.133cm so…
Paul
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Uncertainty of propagation

I'm doing a lab (ballistic pendulum) and I am required to come up with an uncertainty of propagation for the velocity equation given by: $$V_b = \frac{(m_b + m_c)}{m_b} (2g \Delta h)^{1/2}$$ Where $$\begin{align} V_b &= \text{initial velocity of the…
Joshua Bitton
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How to find uncertainty of slope and y-intercept of linear fit from uncertainty of data

I know how to find the slope and the y-intercept of a linear fit of some data by least squares. What I can’t find is how to calculate the uncertainty of these two quantities given the uncertainties of the data. `
Santiago Gonzalez
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Moment of inertia of hollow paraboloid

A hollow paraboloid of length $l$ and radius $r$ with mass $m$ and uniform density $\rho$ has the origin at the base of its circular cross section, and at the center of its cross section. I am trying to find the moment of inertia for the axis that…
alexmesa
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Efficiency physics problem

84 An internal combustion engine consumes 1 gallon of diesel fuel per hour. It provides a constant 10 hp. One gallon of diesel fuel has potential energy of about 115,000 Btu. Remember that 1 hp × 42.44 = 1 Btu/min. What is the efficiency of the…
Jon
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What kind of equation is this?

I saw a book on my brother's bookshelf and I decided to look through it and to me it looked pretty complicated (it's physics). On the first page I encountered the Rayleigh-Jeans formula: $$u(v) \space dv = \dfrac{8\pi v^2 kT}{c^3} dv$$ I have a…
fssalk
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Easy questions on 1-d kinematics equations.

I want to double check that my solutions are correct: An elevator is traveling upward at 10 m/s. It slows to a stop at the designated floor in 4 s. What is the acceleration of the elevator while it is stopping? $v=at+v_0$ $0 m/s =…
user130306
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Analyzing a Position Function obeying Hooke's Law, and Simple Harmonic Motion

Given the following position function: \begin{equation} x(t) = 4.00 \cos(3.00\pi t + \pi) \end{equation} I have to extract the following information which are the following: Frequency Amplitude Period Phase Constant The system is said to be…
Jose M Serra
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Uniform motion question

A biker and a skater set out at 4:30 PM from the same point, headed in the same direction. The biker is travelling at a rate of 15 km/hr faster than twice the speed of the skater. In 1.5 hours, the biker is 35 km ahead of the skater. Find the rate…
Simran
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Time required to achieve change in velocity when acceleration varies with velocity.

This question is similar, but I am a bit out of practice on mathematics and struggle to apply the steps to my problem. How can the $\triangle$$t$ be calculated for a given $\triangle$$v$ when acceleration changes as a function of $v$? Given: $a(v)…
Cardinal
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Time for object to reach target

Im' trying to work out out long an object would take to reach a target given that it decreases in velocity over distance fired. The graph of the object velocity over distance is shown by the following ballistic chart: As can be shown by the graph…
johhny B
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What's wrong with this derivation of the Moment of Inertia of a disc?

I'm currently in AP Physics, and we're doing our moment of inertia unit. I'm also currently in multivariable calculus, so I've been trying to apply some of those concepts to physics. I've run into a problem with calculating the moment of inertia of…
Owen Mitchell
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Four-potential, electric and magnetic field generated

Given a four-potential (coordinates are written in Einstein's notation) $A=(x^1, 2x^1, x^3 - 2x^2, 2x^3)$ which electric and magnetic field are generated? $E=(-c,0,2c), B=(0,1,-2)$ $E=(c,0,2c), B=(1,0,-2)$ $E=(-c,-2c,2c),…
Ant2198
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A mass of 100kg is lifted with a constant acceleration of 1m/s^2. Find the power delivered in lifting after 2s

Also find the power delivered by gravity Displacement of the object $$s=\frac 12 at^2$$ $$s=\frac 12.4$$ $$s=2m$$ Work done $$W=F.s$$ Force applied is $$F=ma$$ $$F=100$$ Therefore $$W=200J$$ Power $$P=200/2=100W$$ But the answer is $2200W$.…
Aditya
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