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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What's the force that the Earth exerts on a person standing still?

Bill stands up still on Earth's surface. He weighs 50 Newtons. What is the force that the Earth exerts on him? A. Greater than 50 N B. Less than 50 N c. Equal to 50 N I am stuck between B or C. Is the force equal to his force, or is it less? He is…
Dylan
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At what distance from Earth’s surface is the acceleration due to gravity 7.33 m/s2?

I used the equation F = Gm1m2/d2. I'm trying to find the distance (d). I have G (7.33 m/s^2). But I also don't have F or m1 and m2. How do I find these three unknown variables?
Dylan
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Projectile distance

A ball is shot at a velocity of $10.0\ m/s$ at $40.0^\circ$ above the horizontal. How far away does it land? I know that the horizontal displacement equals time*horizontal velocity where here the horizontal velocity is $8\ m/s$. I don't know how…
Dylan
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Spring Equation Correctedness

A mass .60 $\mathit{kg}$ is attached to a spring with a spring constant of 130 $\mathit{\frac{N}{m}}$. There are no non-conservative forces acting, and the system is stretched .13 $\mathit{m}$. Find the force when it is instaneous…
Jose M Serra
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Why is an object that is changing direction said to be accelerating?

My maths teacher explained this to be me by way of analogy: a car driving around a perfectly circular track would be constantly changing its velocity (while the magnitude of the velocity is not changing, the direction is). Because acceleration is…
Joe
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Force and gravitation

Mass m resting on earth(of mass M and radius R) travels along with earth rotation at surface velocity V around earth center. So force towards earth center is = centripetal force = m.V.V/R but calculating other way, the force towards earth center is…
Champak Patel
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What is total distance travelled by plane on two different speeds.

I was trying to solve a question today. An aircraft travels at a speed of 180mph during the first half and at a speed of 460mph during the second half of its route. Total flight time is 04:15 hours. What is the distance between airport of departure…
Rowan de Graaf
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Calculate G Force On Cannon Payload

Have a pneumatic cannon that launches a mouse via a pusher plate when lured into the barrel. How many Gs will the mouse feel when launched? Pusher Plate Stroke = 8" Distance Mouse Travels (at 45 deg): 20 feet Weight of Mouse: 0.8oz (is this…
Wingsy
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Calculate the time elapsed

A car of mass 1800 kg moves from rest , if the power of the engine is constant and equals 75 horse after how many seconds does it speed get 17.5 m/s $$a)\; 5 $$ $$b)\; 10 $$ $$c)\; 2 $$ $$d)\; 7.5$$ My turn: $$P= F \times V , F = 3150…
Hussien Mohamed
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Evaluate the change in the potential energy

If the force $$F=3i +4j $$ moves a body from the position $$A(2 , 3)\ \mathrm{to}\ B(7 , 6) $$ .Evaluate the change in the potential energy of the body . My turn: The work done by the force =$$(3,4) • (5 , 3)= 27$$ $$\delta PE + \delta KE = W…
Hussien Mohamed
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Determine the resultant using triangle method - Analytical Method - Vector Quantity - Physics

I'm having some problems finding the resultant in my physics subject. So heres the given problem: A = 10 meters B = 20 meters 30° The graph looks like this: A is in between Q1 and Q4 in x axis the B is in Q2... I need to find: a. A + B b. B - A c.…
Jane Samson
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Rearranging Formulas - How does this formula turn into this one.

How does $ \Delta E_t = m\times c \times \Delta \Theta $ rearrange into $ \Delta \Theta =\frac{\Delta E_t} {m \times c } $ Would prefer if you could break it down step by step if possible.
Raiden -
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Calculate free-fall time of object with initial velocity

For the life of me I can't work this one out. I need to calculate the time for an object to free-fall when it has an initial velocity vector. See below for explanation image: I am trying to calculate the time for the box to fall when it has $ v =…
Polymer
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Notation in wikipedia article about Wick's theorem

The wikipedia article about Wick's theorem can be found here. In that article, they use a rather strange notation: $$\hat{A}^{\bullet}\hat{B}^{\bullet}$$ the bullet superscript isn't defined in the article. I take it that they mean that $\hat{A}$…
the_photon
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Is the Schrodinger Equation easier to solve in Spherical Coordinates when dealing with the Hydrogen Atom?

Recently, I have been researching the Schrodinger Equation. I am now attempting to derive the solution to the equation for the Hydrogen Atoms potential energy function. What I am wondering is that whether it is easier to do a coordinate change in…
ExtantCanvas966
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