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
0
votes
1 answer

HOw to find acceleration when its equal to zero?

The velocity v with arrow of a particle moving in the xy plane is given by v with arrow = (6.0t − 4.0t^2)i + 7.1j, with v with arrow in meters per second and t (> 0) is in seconds. (a) What is the acceleration when t = 1.1 s? (Express your answer in…
user416503
  • 137
0
votes
3 answers

Rewriting $x\left(t\right)=x_0+v_0\left(t-t_0\right)+\frac{1}{2}a\left(t-t_0\right)^2$

I have this equation in my book $x\left(t\right)=x_0+v_0\left(t-t_0\right)+\frac{1}{2}a\left(t-t_0\right)^2$ And it says that it can be written as $x\left(t\right)=a_1+a_2t+a_3t^2$ Where…
windy401
  • 1,211
0
votes
2 answers

The Parallel-Plate Capacitor $C = \epsilon_0A/d$

I'm working a lab right now where I am given C, A and d and need to re-arrange the formula to find e0 How do I do that? I know dumb question... in a physics 2 class and can't do basic algebra to rearrange a formula
Jessica
  • 105
0
votes
0 answers

Finding velocity components right before a projectile hits the ground at a point s.

I have a problem where a projectile is shot from the edge of a building at an angle and lands at a point s. After completing the first few parts and getting to the 4th, I'm now wondering about how the answer came out. That part of the question was…
windy401
  • 1,211
0
votes
1 answer

constant acceleration problem

An electron has a constant acceleration of $2.5 \text{ m s}^{-2}$. At a certain instant its velocity is $12.1 \text{ m s}^{-1}.$ (Indicate the direction with the sign of your answer.) $(a)$ What was its velocity $2.5$ s earlier? $(b)$ What is its…
user138342
  • 27
  • 1
  • 4
0
votes
2 answers

Calculating margin of error, but the error cancels out.

For the following formula: $V_1=V_2\times(R/4R)$ I want to know V's expression of sensitivity when R has a variation of 20%. So: $V_1=V_2\times\frac{R\pm\delta R}{4(R\pm\delta R)}, \delta R=0.2R$ Here R±δR cancels out, which is realistically…
Richard Yang
  • 3
0
votes
2 answers

Thermal transfer calculation

Say I have a flat rectangular bar of aluminum with a known volume. Sitting directly on top of that piece of aluminum is a rectangular circuit board made of FR4 (standard circuit board material). I can raise and lower the temperature of the aluminum…
PICyourBrain
  • 131
0
votes
4 answers

I can't understand result in my textbook.

I've the following equation in my physics text book: given that $$t=t_1+t_2+t_3,$$$$t_2=t_3$$ $$s_1 = v_1t_1,$$ $$s_2 =v_2t_2;$$ $$s_3 = v_3t_3,$$$$s_2+s_3=\frac{s}{2}=s_1$$ $$t= t_1 + 2t_2 \implies t_2=\frac{t-t_1}{2}.$$ From here starts the part…
nameLess
  • 15
  • 2
0
votes
1 answer

What is the magnitude of the average frictional force on the block?

A $2.0 \space kg$ block, initially moving at $10.0 \space m/s$, slides $50.0 \space m$ across a sheet of ice before coming to rest. What is the magnitude of the average frictional force on the block? I know the answer is 2.0 N.
user42896
  • 31
0
votes
1 answer

Jumping from lower ground

I have a fixed initial velocity V(Vx,Vy,VZ) and a spot on higher ground E(Ex,Ey,Ez), my character must jump up there and he stands still at S(Sx,Sy,Sz). How Can I find the closest point to the character that can make him achieve the jump (same…
Kahel
  • 187
0
votes
1 answer

Calculating frequency of Earths orbit

If the Earth takes one year to orbit the sun and the frequency is f = 1/T with T being the period. Then what would the period be ? I am use to dealing with seconds and minutes but this question involves a year.
Dan
  • 1,649
0
votes
1 answer

How long does one revolution take for a rotating cd

I have the question "When a cd rotates at an angular speed of 10.5 rads^-1, how long does one revolution take ?" Here is my attempt. Is this correct ?
Dan
  • 1,649
0
votes
2 answers

Frequency and angular velocity of washing machines drum

I have the question "A washing machine runs its spin cycle at 800 rpm(revolutions per minute). What is the frequency and the angular velocity of the machines drum?" I know that frequency is 1/T where T is the period. So I multiplied 800 by 60 to…
Dan
  • 1,649
0
votes
1 answer

When is an image produced by a lens sharp? (optics)

Very basic question about optics: suppose I have a thin lens with a given focal length $f$, a screen and an object at distance $a$ from the screen. What is the mathematical relation that must be fulfilled so that the image of the object is sharp on…
Pxx
  • 697
0
votes
1 answer

Physics motionless system

In this motionless situation, find the mass of the hanging block on the right side of the system. The mass of the left block is 3.5 kg, the masses of both the carts are 1.0 kg, and the left angle is 12 degrees and the right angle is 36 degrees. I…
Maggie
  • 185
1 2 3
…
39 40