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
-1
votes
1 answer

Will gravity pull the tool back or is it lost forever?

Consider aspacecraft with mass $M=160\:\rm Mg$. An astronaut on the craft, in trying to stop the thruster, lost a tool with mass $m=250\:\rm g$. The tool now sits $2\:\rm m$ from (outer shell of) the spacecraft. A question asks: If the tool is…
mathsiscool
  • 29
-1
votes
1 answer

How to convert pressure units from Pascals to Pound per Square Inch?

My Physics Teacher wanted us to convert Pascal into Pound per Square Inch, not psi... he mentioned we'd use 9.8 m/s²... I'm not sure. I already did the simplest but it's not quite the answer: I used the unit psi 'cause I figured it's the same as…
Bot
  • 1
-1
votes
3 answers

How can I understand this mathematical formula?

I was trying to understand this formula for the center of mass, given by: $$ \frac{m_1x_1 + m_2x_2}{m_1 + m_2}$$ Can you please explain this to me step by step of what it really means and how this equation can give me the center of mass.
user662650
  • 525
-1
votes
1 answer

calculating constant deceleration with time

The distance between point A and B is 500m, an object is moving at 50m/s, the object will stop exactly at 500m when it's deceleration reaches zero after 5 seconds, the deceleration is constant, how do I calculate the deceleration?
DnBs
  • 1
-1
votes
1 answer

Convert Area Density to Volumetric Mass Density

If the area density is 5.5kg/m², then what is its volumetric density in kg/m³?;) The thickness is 1/8 inch. I'm not getting the answer I'm being told is the correct answer and going nuts here;) What is the formula here? Thank you.
Jason Hunter
  • 101
  • 1
  • 1
-1
votes
1 answer

How did they get rid of the “j” in this equation of a low pass filter?

I'm trying to learn how to do equations of filters for synthesizer design. I am stuck on this: https://s15.postimg.cc/eiuti9fbv/image.png How did they get from the equation with the jw to the one without the j in it? ie. How did they get rid of the…
mike
  • 381
  • 1
  • 2
  • 14
-1
votes
1 answer

A roller coaster car rises 50 m. If the next rise, after 120 m of travel it is 40 m. What is the maximum allowable friction force for a 500 kg cart ?.

A roller coaster car rises 50 m. If the next rise, after 120 m of travel it is 40 m. What is the maximum allowable friction force for a 500 kg cart ?.
Oscar Méndez
  • 1
-1
votes
3 answers

D = r * t based on a boy running up and down a hill

Jack is three times as fast running down a hill than running up the hill. If it takes Jack an hour longer to run up the hill than run down the hill, how long, in hours, does it take Jack to run up the hill? I don't even know where to start because…
Felor Rider
  • 9
-1
votes
1 answer

When switch is on, the voltage is being calculated as $45V$. What is the voltage when switch is off?

When switch is off, the voltage is being calculated as $45V$. What is the voltage when switch is on? I'm stuck at this problem! Regards,
Goendo
  • 127
-1
votes
2 answers

Relationship Between Starting Angle of a Projectile and it's distance

If we say that we shoot a projectile at 100% force, and at 45 degrees and it goes n meters, then if we shoot the same projectile at 50% force and 45 degrees it will go n/2 meters. Now if we halve the angle instead of the force, now shooting the…
sebtheiler
  • 125
-1
votes
3 answers

Decomposition of Distance and Time on Speed

I would like to know the individual effect of changing distance and time on the change of speed. Eg. 1. Distance $= 1200$ Time $= 1000$ Speed$_1$ $= 1.2$ Distance $= 1400$ Time $= 1200$ Speed$_2$ = $1.16667$ I understand that…
SlinkyBill
  • 3
-1
votes
2 answers

Find kinetic friction given mass speed and time.

You kick a $12\text{kg}$ box across the floor. The box initially slides at $2.0 \text{m/s}$, but comes to a stop within $1.2 \text{s}$. What is the magnitude of the force of kinetic friction on the box?
John Hai
  • 1
-1
votes
1 answer

How do I find speed at a given point in time given the acceleration

I have the acceleration and the time elapsed. Say the acceleration is 5m/s^2. I need to find the speed at second 3. How would I go about doing that?
Ramiro Rocha
  • 1
-1
votes
1 answer

How to calculate plot point?

Why is 3 wrong? I know the answer is true for 5, so shouldn't it apply for 5 as well, since both trend negative?
user442847
  • 5
-1
votes
1 answer

Acceleration/tension of two masses connected by a cord?

https://i.stack.imgur.com/gl8Ou.png For a, I did: 2.8 - 3.6sin30 * 9.8 / 3.6+2.8 = 1.5 Does that mean 1.5 is the answer for both questions on a? For b, I have a = pos, so m2 is down? Is that right? For c, I'm not sure which formula to use.
user416503
  • 137
1 2 3
…
39 40