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.

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How to calculate work with i and j?

I don't understnad how to solve. The problem is: w = ( 2.0 N i - 0.6 N j ) X (-3 m i) Is it supposed to be: (2.0N)(-3m) i - 0.6N J ?
user416503
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kinetic formula question

The formula is $K = \frac{1}{2}mv^2$. Which part is the square supposed to influence? Does it affect just $v$, $mv$ or $\frac{1}{2}mv$? The problem is $\frac{1}{2} (1.2\cdot 10^5 [kg]) \cdot 40.8^2 \left[\frac{m}{s}\right]$. How would this resolve?…
user416503
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How can the reaction force of an object be exerted on both bodies?

Assume you have 2 bodies A on top of B. They're both accelerating upwards at 0.5 ms^-2. This is my logic for finding the force exerted on B by A (correct me if I'm wrong) I was told that to find this, you the force of A on B. And by Newton's 3rd…
Yusuf Abukar
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Increase/decrease forces question

https://i.stack.imgur.com/QNFbc.png I don't understand why these are marked wrong. THey should be correct. Is the software wrong?
user416503
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How to find speed with friction?

You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill. You find that the slope of the hill is θ = 14.5°, that the cars were…
user416503
  • 137
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Confused about tension and friction

A 68 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 158 above the horizontal. (a) If the coefficient of static friction is 0.50, what minimum force magnitude is required from the rope to start the crate…
user416503
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Confused about friction forces

"A bedroom bureau with a mass of $45$ kg, including drawers and clothing, rests on the floor. (a) If the coefficient of static friction between the bureau and the floor is $0.45$, what is the magnitude of the minimum horizontal force that a person…
user416503
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How to find masses when given tension?

I don't understand how the following problem can be solved. There's not enough info. This is what the book says about it, but it fails to explain how disc D is 1.0 kg:
user416503
  • 137
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Moving polar coordinates so that they don't start at (0,0) and Kepler's Second Law

I'm not awfully familiar with polar coordinates, and I'm trying to prove Kepler's second law via observations. I found plenty of articles regarding proof of Kepler's second law, and the following seemed the easiest to understand:…
clarinetmath
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Kepler's Second Law Help

I have a big project due tomorrow morning regarding Kepler's laws, and I'm stuck on one. I have to prove Kepler's second law via observations I've collected from Stellarium. Problem is, the areas either end up negative or they're not equal. The…
clarinetmath
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Finding length of fiber

It should be right. I did $\dfrac{V}{\pi r^2} \rightarrow \dfrac{0.5722}{3.14\cdot 3.6^2} = 0.01406090272863$. What's the problem?
user416503
  • 137
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HOw to find curve?

https://i.stack.imgur.com/FA6xX.png I don't understand how this is wrong. I tried AF and OC. Either of those should be right, since those depict 45 angles. What's the problem?
user416503
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Describing vectors help

https://i.stack.imgur.com/xw37w.png I don't understand. Seems that the answers would be that everything is equal? There's nothing that indicates parallel, perpendicular, or 0, is there?
user416503
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how find constant speed

A car travels up a hill at a constant speed of 19 km/h and returns down the hill at a constant speed of 50 km/h. Calculate the average speed for the round trip. Am I supposed to add the numbers, divide by two, then subtract two? This is how the…
user416503
  • 137
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2 answers

Find average molecular speed in gas when temperature doubles?

I have the following formula. The task just says what happens to average speed of the molecules in a gas when the absolute temperature doubles? I don't know how to go about tasks like this. What am I to solve for to hopefully find something like…
Algific
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