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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How do you calculate kw from kwh?

A family spent \$235.25 in the month of February to heat their house. a) Calculate the kilowatts of energy they consumed given that the price of electricity is \$0.09/kWh (kilowatt hour). Assume there are 28 days in February. I came up with 672 kW,…
ShrimpCrackers
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Simplifying Circuits with kirchoffs rules

enter image description here I have spent such a long time looking at videos on simplifying circuits which I understand but even the complex ones that I am coming across seem more straight forward for finding equivalent resistances and simplifying…
Ian
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Question about finding stress from beam's weight

I have a problem of a fixed/pinned beam. I have to account for the weight of the beam in finding the stress of the beam at the fixed end. It's stated to assume that the beam's weight is uniformly distributed along the span of the beam. I'm given the…
BradK2fan
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Asked to determine the factor of safety in operation.

Asked to determine the factor of safety in operation. I understand that Fs = max allowable stress/ actual stress. However the information given is (ultimate tensile stress = 490mn/m2 and the ultimate shear stress = 290mn/m2. How do i work out the…
k. adank
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How do you find the speed of a car without skidding?

Q.)A car rounds a turn of radius 120 m on a flat road. If the coefficient of friction between the tires and the road is 0.50, what is the maximum speed of the car without skidding? I really don't get this problem. I get that centripetal force=…
Nemesis
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Velocity and displacement

My problem concerns displacement and velocity. Let $u$ denote displacement vector and $u'$ the velocity vector. Assume that $u(0)=0$ and $u'=0$ all the time. Then $$u(t)=\int_{0}^{t}u'(s)ds+u(0)=0.$$ So, if velocity is constant and equals $0$, then…
zorro47
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Need help with finding x and y coordinates

"A 1.50 kg particle has the xy coordinates (−1.20 m, 0.500 m) and a 3.50 kg particle has the xy coordinates (0.600 m, −0.750 m). Both lie on a horizontal plane. At what x and y coordinates must you place a 4.00 kg particle such that the center of…
user435909
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need help with finding mass and height of the ball?

https://i.stack.imgur.com/KIRkO.png I have : h =1.7m , M = 0.65 kg, v i = sqrt 2gh = 5.77 vf = 2m / M + m (-vi) + m-M / m+M (vi) = 0. But this cannot be reduced because there are too many m's. How then can it be solved?
user435428
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Angular Velocity of a Pulley

I am having trouble with this questions about angular velocity. Could you please show me the solution? I keep getting $\approx 41.9$ cm/sec but my friend gets $\approx 419$ cm/sec. Question: A pulley of radius $10$ cm rotates $40$ times a minute. …
Tim
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find forces on ramp?

According to the book, the formula is: $$ F\cos\theta - mg\sin\theta = ma $$ It also says to set $a = 0$. I don't understand how to solve it. Also, why is $a = 0$? And isn't the right formula $F = ma$?
user416503
  • 137
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How can I find speed of the ball?

The figure below shows a ball with mass m = 0.334 kg attached to the end of a thin rod with length L = 0.522 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle. The rod is held horizontally as…
user416503
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Components of a kinetic projectile

From the edge of a cliff, a 0.55 kg projectile is launched with an initial kinetic energy of 1550 J. The projectile's maximum upward displacement from the launch point is 131 m. a, What is the horizontal component of its velocity? b, What was the…
user416503
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for the roof truss as shown, it is pinned at point A and supposed by a roller at point H. determine the reaction at joint A and joint H.

For the roof truss as shown, it is pinned at point $A$ and supposed by a roller at point $H$. Determine the reaction at joint $A$ and joint $H$. This is one of the problem in our "statics of rigid bodies" midterm exam and actually our whole class…
leeeeee
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Variable Resistance

I'm stuck on this question from a past paper. A parachutist jumps out of a hot air balloon. The resistance is proportional to the speed of the parachutist. The parachutist has a terminal velocity of 4 ms-1 How far did he fall after 3 seconds. I'm…
PhilCK
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How to graph kinetic plots?

https://i.stack.imgur.com/usNWM.png I don't understand how to solve. F1 and 2 are both equal, rihgt? What is the question asking?
user416503
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