1. B

    Moving garden hose - why does the water travel shorter distance

    We all know a garden hose. Keeping is stationary it has a certain throw length based on nozzle exit velocity and angle of the nozzle. If you start swinging/rotating the hose e.g. in the horizontal plane, then the throw length decreases significantly - but what are the physics behind this and can...
  2. H

    boat moving in a river

    I am looking for an explanation on how to calculate this situation. You are floating in a boat in calm water some distance D miles from a dam. A gate is opened at time T. You know the width and depth of the river, the size of the gate and how far above the low side of the dam it is located...
  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. B

    Compression of spring with moving blocks

    Got another one, hope it isn't as big an oversight. block 1 follows block 2 on a frictionless surface. Block 2 has a spring attached behind it with spring constant=k=1100N/m. Block1-> m1=4kg v1=20m/s Block2-> m2=10.0kg v2=6m/s The collision between the two is totally inelastic. And...
  5. R

    Moving Plank

    Hello all Please any help to solve this problem ? i will be so thankful . Best regards
  6. J

    Force on object moving on a curve

    I'm not sure how to approach this problem. We never went over problems like this in class.
  7. T

    What are the collision forces applied to the stops in a moving triple pendulum?

    Hello, it's been a while since I did not use lagrangian mechanics and all this stuff and would bet it's needed for my purpose. Introduction : if I take a simple pendulum and make it collide on its origin with a stop, how much will suffer the stop ? Knowing that the pendulum is subject to an...
  8. B

    Cylinder moving on plane with friction

    A hollow cylinder with mass m and radius R stands on a horizontal surface with its smooth flat end in contact the surface everywhere. A thread has been wound around it and its free end is pulled with velocity v in parallel to the thread. Find the speed of the cylinder. Consider two cases: (a)...
  9. T

    Moving mass of lift exponentially

    (Edit: title should be 'Moving mass of lift increases exponentially) Hi all, I need some help understanding something, but to give you some quick background I am doing a final project on my access course at college on how tall can you build a skyscraper. A problem engineers face is the issue...
  10. R

    Dynamics: Cannon ball and the moving gun A cannon (mass mc) is standing on the ground before it fires a cannon ball (mass mb). At the time t0=0 the cannon ball is leaviing the gun at height hm above the ground with velocity V0 at angle alpha. Air resistance can be neglected. 1...
  11. R

    Kinematics: moving car with person inside At the time $t_0 = 0$ a train starts to accelerate from rest and person starts to walk inside the train from point A to point B (distance d). The acceleration of the train is given as a function of the distance covered: $a_T(s) =...
  12. C

    postion vs time graph for moving charged particle?

    Question {Consider the system shown to the right. Particles 1 and 2 are fixed in place while particle three is placed at the location shown and released. Let’s look at the mechanics of q3, which has a mass of 3.00 X 10-5 kg. What will be the net force on q3? What will be q3’s acceleration...
  13. L

    flow rate in a moving pipe

    for part c , why when the vane is moving , the flow rate doesn't change ? ? The flow rate is given by the formula Q=Av , where A = area , v = velocity . IMO , when the velocity of vane change , the flow rate is no longer 0.687kg/s , it should be 0.68kg/s = (10^3)(A)(24) , A= 2.83x10^-5...
  14. J

    interia and centrifugal moving

    Hi. We have a body moving uniformly accelerating motion. A front body will place Centryfuga perpendicular to the direction of motion, rotating centrifugal movement. Removes centrifuge inertial force that counteracts the movement of the body? (Google translator) Thank. By.
  15. H

    Moving gas pressure depending on temperature

    Hi, I am an Electrictrical Technician, so there are lack of knowledge and understanding of the Gas Laws/Thermodynamics(I believe my question is related to Thermodynamics) Could you please help with the following: Compressor1 = Compressor2 Temperature1(T1) > Temperature2(T2) How is...
  16. M

    Moving mass on centrifuge, included at angle

    Hi, I've been working on the problem of a moving mass on a centrifuge constrained to a line of travel, with the line of travel offset an angle from a line through the centrifuge center. The centrifuge rotates with angular velocity omega (non-constant). I have found the equation of motion for...
  17. F

    Energy intensity moving fluid

    Hello, I have a pipe through which I would like to pump some water. Say the velocity is 5 m/s and diameter 0.5m. The pump is horizontal. How can I find the energy intensity (kWh/kL) needed to transport the water over 100 metres? I have found the head loss by using the roughness of steel...
  18. I

    2 charges moving in a train which comes to a sudden stop.

    Consider a train moving in a certain direction and there are 2 points charges, one of them is put at the front-end and the other is of opposite charge put at back-end and I am interested to examine the electric force between them relative to different observers. Now consider the train comes to...
  19. L

    phase difference of two moving particle

    i am having problem with part b , how do we know that the particle is appraohing each other, moving in same direction or away from each other? other than the method of plotting graph?
  20. S

    Air projectile to hit a moving target

    I have a target (projectile) moving by the equation of motion (in the plane): r = r0 + v0*t + 0.5*a0*t^2, with r = (x,y). at position r1 = (x1, y1) we have a cannon that shoots another projectile at speed s (i.e. has a initial velocity v = (s*cos(phi), s*sin(phi)). Thus, the 2nd projectile...