1. K

    Speed between two cars

    Hi, I found a programming problem that calculated the speed between two cars as below and I would like to know how the calculation is done. it is about determining the speed of two cars. The coordinate reference system (y,x) is attached to the ego vehicle (as shown in the attached figure)...
  2. H

    terminal speed of the vessel

    In vacuum and weightlessness, at the bottom of a cylindrical vessel (a cup), there is a layer of solid substance of molar mass μ. This substance sublimes slowly (evaporates from the solid phase into gaseous phase) and pushes thereby the vessel to the opposite direction. Estimate the terminal...
  3. V

    Harmonic motion with spring moving with constant speed

    A spring whose constant is $k$ has its left end joined to a mass $m$ while its other end is always moving whith constant speed $u$. The coefficient of kinetic friction between the mass and the horizontal surface is μ and the coefficient of static friction is 2μ. The mass can carry out harmonic...
  4. A

    Hi, will u help me guys? :)

    A special vehicle moves at a speed v on a flat frozen surface Lakes. Maximum force tangent to the surface of the lake, with which the vehicle can operate on this surface, it has an F value and does not depend on its velocity or the angle between the vector of this force and the vehicle speed...
  5. I

    Why total time taken s₁/v₁ + s₂/v₂ + s₃/v₃ in average speed?

    As we know the Average speed = Total distance / Total time but why in the case below Distance traveled = s₁ + s₂ + s₃ and total time taken = s₁/v₁ + s₂/v₂ + s₃/v₃ How is it possible? Could you explain please? so, altogether Vav = s₁ + s₂ + s₃ / ( s₁/v₁ + s₂/v₂ + s₃/v₃)
  6. R

    Physics - speed. I need help!

    Heres the exercise: 9. (CAROUSEL) Four children are rotated on a carousel and their speed on the ground is v. Kids sit at the same time as the squares ABCD, at the same distance from the rotation axis and throw each other ball. When Angelo, at the top of A, throws the ball directly at the C...
  7. L

    How do you determine the speed of light.

    How do you determine the speed of light?
  8. L

    THE speed of light in sofar as the determination is

    Roemer (1676) is accredited as the first to measure the velocity of light but Roemer's calculation of the velocity of light is based on Io forming four eclipses at L, K, F and G but Roemer does not indicate the dates of all four eclipses that are used to calculate the velocity of light since it...
  9. L

    Calculate a derivation of a the angular speed of a solid body

    I am practicing for a mechanics exam. Please find the problem and solution in the image: I am not able to reach the solution. The question is to derivate an expression of the angular speed to obtain the angular acceleration. The angular speed is a function of the rotation angle, so...
  10. J

    Speed of sound in water

    For a science project, I need to measure the speed of sound in water. Obviously, I don't have any fancy equipment to do this so I came up with a set up I'm not sure will work: I have a PVC cut to 29.8 cm long. I attached two thin pieces of glass (a screen cover for a phone) on each end to...
  11. P

    The speed of gravitational waves

    https://physics.aps.org/articles/v10/134 Gravity waves and light move at the same rate, experiment now shows
  12. K

    An unorthodox Speed vs Time to Speed vs Distance question

    Hi There, I'm doing some analysis work on a lab I ran recently for some of my undergrad thesis work.. and I think I've had a brain fart. I've got some recorded data which shows the speed of an object (in this case a towing carriage) over time. I need to get this speed-time plot to a...
  13. A

    Question about orbital speed

    Hi guys! New guy here. Anyways, I was thinking about why the moon doesn't fall to earth today and as I did some research, found that the orbital speed is equal to the square root of the gravitational constant multiplied by the mass of the Earth divided by the radius from the center of the...
  14. K

    speed of space station

    After watching the interstellar movie I have a question: which solution will consume less fuel? The space station moves in a circular orbit and has too slow speed. To increase it has two possibilities: 1. Increase the orbital speed, 2. Increase the height of the orbit, and thus reduce the...
  15. avito009

    Neutrino travelling at the speed of light.

    As we know that according to relativity nothing that has mass can travel at the speed of light. But the latest study about neutrinos has shown that neutrinos have mass. But how can neutrinos that have mass travel at the speed of light?
  16. E

    Is Planck's constant & light speed the "boundary" of the cosmos?

    Hullo-- I read this book by Christopher Bek (Philosophymagazine), The Theory of One: realizing the dream of a final theory (2015). It's core, which the author says he deliberately Occam-ized it to the maximum (leaving the mathematics for later), is this: P1: There is no causality...
  17. J

    displacement problem

    Hi, I got a different answer than the lesson text I am working on, and was hoping someone could explain. V2 = 31.1m/s a = 2.7m/s^2 t = 3.2s d = V2(t) - 1/2(a)(t^2) = (31.1m/s)(3.2s) - 1/2(2.7m/s^2)(3.2s)^2 = (99.6) - (1.35)(10.24) = 99.6 - 13.824 = 85.776m I...
  18. J

    Trying to find the displacement

    Hi, I'm hoping to get some clarification on this. I'd like to see if I did it right, and if not then I'd really like to know what I did wrong. A car is traveling at 20.83m/s , it takes 3.4s to stop, what is the displacement? d=1/2(V1+V2)t = 1/2(20.83m/s+0m/s)(3.4) = 1/2(70.83) =...
  19. P

    m=2(1 means light speed)

    1+1=2 1*m=(1^2)+(1^2) 1*m=2(m=2, m is meter) Every number in formula has 1 as the truth(logical basic) So (1/2)*a*(t^2)=S 2*S=a*(t^2) a*t=c(light speed) t=2*S t=4*x And time means 4 multiply x, so x is relativity number for formula.
  20. C

    Relation Between Density of Water and Flow Speed

    Hi, I'm a current IB high school student who is conducting my individual end of the year lab report. For the experiment I decided to test the relationship between the salt concentration (increase in density) of water and the time it takes for it to drain from a bucket. I conducted the experiment...