What is Drop: Definition and 875 Discussions

A drop tower or big drop is a type of amusement ride incorporating a central structure or tower. Drop towers vary in height, passenger capacity, lift type, and brake type. Many are custom-made, although there are some mass-produced designs. Riders experience free-fall initially, followed by rapid heavy deceleration.
With most drop towers, a gondola carrying riders is lifted to the top of a large vertical structure, then released to free-fall down the tower. Brakes slow the gondola as it approaches the bottom of the ride. Some designs expand on this concept with features such as rotating gondolas, or several bounces before coming to rest.
Most drop towers require child riders to exceed a minimum height; limits vary widely depending upon the nature of the tower, with a 9-metre (30 ft) tower for smaller children from 95 centimetres (37 in) tall, and a 35-metre (115 ft) tower having a 130-centimetre (51 in) restriction.Drop towers use a magnetic braking system to slow the carriage quickly and smoothly once it reaches the bottom of the tower. This system is fail-safe because magnets do not need to be powered by electricity or other sources; they work intrinsically by the laws of magnetism.

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  1. P

    Voltage drop through a transformer

    Hi, I understand that for a real transformer there will obviously be a current drop through the transformer due to winding resistance, core losses hysteresis etc. For the sake of power system analysis, however, do you still assume that the secondary and primary voltages are linked by terms of...
  2. A

    Schools Should I drop out of graduate school?

    I'm a first year graduate student working toward a Physics PhD at a large, top 50, private university in the US. I have weekly (increasingly frequent) panic attacks and I cannot motivate myself to study or do homework. Because of this, I have intense feelings of guilt nearly constantly. I wake...
  3. T

    Voltage Drop & EMF: Inductor Circuit Explained

    Hello, Please i have a question.When we have an inductor in a circuit we say that we have 2 electric field : conservative and non-conservative. so who is doing work on the charges?if we draw an rl circuit with a DC source the conservative electric field across the inductor has the same...
  4. D

    Drop test of an object, are my physics right?

    Hi, I will keep this short and sweet. I am drop testing an object of complicated geometry froma set height in 10 different orientations. Due to the complexity I decided to make a free falling rig where it slides (via roller bearings for example) when released. Simple freefall analysis...
  5. D

    What is the charge of the oil drop in Millikan's experiment?

    Homework Statement When an oil drop falls freely, the velocity first increases, but afterwards it quickly reaches a constant speed, since the air resistance becomes equal to the weight of the oil drop. The air resistance is given by: Fair=6\pir\etav, where \eta is the viscosity of air...
  6. D

    How to compensate for voltage drop across a diode?

    Hi, I am working on a project where I am using a LCD voltage display to measure voltage at 2 points in the circuit. The first is the voltage of the batteries providing the power, and the second is to measure the output of the circuit. It is in a very small box and I don't have room for a...
  7. S

    Reduction Orifice sizing for desired pressure drop

    Good afternoon, I am trying to size a reduction orifice for a desired pressure drop. I do not need the drop to be specific, since this is just for valve protection and not for metering. D1 (Pipe) = 2.5" P1 = 125 PSI P2 Required = 75-85 PSI Q = 1020 gal/hr Fluid = Water, 90 Deg F...
  8. S

    Clarifying the Basics of the Millikan Oil Drop Experiment

    In the Millikan oil drop experiment, was the oil particles positively or negatively charged. and what were the charges of the plates. My textbook and what my gr.10 notes say is that the oil droplets and the bottom plate were positive, but every source online says that they were negative and that...
  9. S

    Motion Diagram of Galileo's Ball Drop from Leaning Tower of Pisa

    Homework Statement Draw a motion diagram for each motion described below. -Use the particle model -Show and label the velocity vectors 22) Galileo drops a ball from the Leaning tower of Pisa. Consider the ball's motion from the moment it leaves his hand until a microsecond before it hits...
  10. B

    BALL DROP EXPERIMENT: calculation of the magnitude of G

    I plotted the distance in cm ( y2-y1) versus the average change in time squared. (This had to be done by hand...) Then I had to find the slope and the y-intercept. Then I was asked to, " ... From your slope, find the magnitude of the acceleration due to gravity (g)" ... I am really...
  11. G

    Bullet drop relative to line of sight

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  12. N

    How can i calculate pressure drop in air compressor?

    hi friends, I am confused with incompressible and compressible flow.Can i use moody diagram for air compressor.How can i calculate pressure drop in pipe.
  13. G

    LC Filter Voltage Drop Considerations

    Hi, I've gotten a little confused and would like some guidance and confirmation, I've designed an H-Bridge inverter which should output 100A at 20Vrms onto a 200mΩ load. The current target output peak voltage (with max duty cycle of 98% considered) is 28.86V. The LC filter is made up of a...
  14. M

    Vibrationel energy of vibration drop?

    I want to calculate the vibrational energy of vibrating water drops. To start with I assume water is inviscid. The frequency spectrum can be found in for example Landau and Lifshitz. But I would like to know the vibrational energy of each mode. How should I proceed? Would it be correct to...
  15. J

    Programs Is a Chemistry Minor Necessary for a Physics Major?

    Hello, everyone. I've had many of my questions answered by these forums before but this one was a little specific so I decided to make an account here. I am a third year physics major with a chemistry minor. I enjoy chemistry and feel that it can help me down the road. As far as my university...
  16. T

    When you drop a ball from above, why doesn't it drill through earth?

    First of all, I want to say that I am totally ignorant about physics. And I do not understand the general concepts of physics at all. Now coming to the question. Suppose, you drop a green tennis ball from above. Now It usually lands on Earth and stop there ( ignore the bounces for...
  17. N

    Voltage Drop Calculation for Bus 2?

    Hi, This is not really homework but since it's homework style, I'll post it here and maybe benefit someone else. Homework Statement I need to calculate the final voltage on Bus 2 (labeled B2 in attached PDF). I am trying to do this using per units and my attempt is attached. The...
  18. T

    Determining Current and Voltage Drop in RLC Circuit

    Homework Statement A circuit contains a 100Ω resistor, a .0500H inductor, a .400μF capacitor, and a source of time-varying emf connected in series. The time-varying emf is 50.0 V at a frequency of 2000 Hz. a) Determine the current in the circuit. b) Determine the voltage drop across...
  19. C

    Simple voltage drop / sign convention

    Homework Statement Find Vad and VebHomework Equations voltage drop, KVLThe Attempt at a Solution I actually did: Vad -24V - 4V + 6V = -22V but this is wrong.I know going the other way Vad: 6V + 8V + 12V = 26V, because it is only drop, and plus to minus on drops means they are...
  20. D

    Why does the cross section drop between resonances?

    Hello. When you have a plot of the cross section in function of the centre of mass energy of an e+e- -> hadrons collision, you get a graph with a few peaks which are due to the resonances (ρ, ω, J/ψ...). But I don't understand why at a resonance, the cross section goes up? Or other way...
  21. Q

    Understanding Voltage Drop in Wires: Causes and Solutions

    Hi Why is there a voltage drop in a wire when there is a high current flowing ?. Is this due to the electrons colliding with the lattice which causes the kinetic energy that the electrons have gained trough the voltage to be transfer to heat energy ?
  22. M

    Can vapor condensation cause significant drop in vapor flow rate?

    Need some help here! My plant just installed a water scrubber for controlling methanol emissions. Results obtained from stack tests have consistently shown the flow rate of the gasses from the scrubber outlet is about 30% of gas flow rate into the scrubber. From process knowledge, most of the...
  23. S

    Chrome Vanadium or Drop Forged?

    Hi; When we go to market to buy tools especially spanners, there are two types of such tools available, Chrome Vanadium and Drop Forged. These letters are punched on them. Please reply as; • What does there means “Chrome Vanadium” and “Drop Forged”? • Which tool is better from both of them?
  24. M

    What is the energy conversion in a forward biased silicon diode?

    A typical silicon diode has potential difference of 0.7V when forward biased, to what kind of energy is the (0.7V)*(I)*(\Deltat) converted? thermal energy only? isn't there potential energy through the electric field in the pn junction?
  25. C

    How Long Can Copper Wire Be in a Data Center to Limit Voltage Drop to 1V?

    Homework Statement Your data center has 100,000 CPUs. Each burns 100 W at 120 V. Copper has a resistivity of 1.7E-8 Ω*m. What is the maximum length of copper wire on the power supply to give a voltage drop of no more than 1V? Homework Equations P = V*I R = (rho*L)/A, where L is the...
  26. B

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    I'm curious the amount the voltage would drop across a resisitor. If you know the power going into the resistor and the maximum voltage allowed is say, 50V. How would that resistor effect the voltage? I understand the voltage would decrease, and when substituting and solving equations the new...
  27. A

    After help understanding black drop effect

    Good evening every one, first post in this forum and only an amateur astronomer here so please be kind. My question relates to the observable black drop effect, when watching the transit of Venus, at first when i looked up what might cause this effect the answer seamed to simply to be poor...
  28. C

    Given impedance, find voltage drop across resistor

    Homework Statement Determine the voltage V0 in the following network if the impedance Z contains: a. a 0.5 mH inductor b.a 10 μF inductor Homework Equations Voltage division for 2 series resistors: (v in)(resistor/total series resistance) ZL = ωLj Zc = -1j/ωC Z = ZL + ZC + R Zmagnitude =...
  29. J

    Air Pressure Drop Problem: Solutions Explored

    I am having a problem with an air pressure drop. I have a supply of 100psi of around 4scfm. I have it regulated down to 90psi, but when I turn on an air turbine motor my regulated pressure drops momentarily (1-2sec) down to 80psi. This drop in pressure is unacceptable to other components in my...
  30. P

    Potential drop when current flows through a resistor

    What is the reason for the potential drop when current flows through a resistor? Is it due to conversion of potential energy of the electrons into thermal energy while flowing through the resistor?
  31. P

    Forward biased ideal diode=>no voltage drop?

    Forward biased "ideal" diode=>no voltage drop? Does a forward biased ideal diode have no voltage drop?
  32. Astrum

    Learn from My Mistake: What to Do When You Forgot to Drop a Class

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  33. S

    Can Millikan's Oil Drop Experiment Accurately Measure the Elementary Charge?

    Homework Statement Hi, I had to calculate the charge of an oil drop using a lab simulation Homework Equations q = mgd/v The Attempt at a Solution This is the result i came up with: The charges are not multiple of 1.6x10^-19 C. How can i fix this? Thanks
  34. Z

    Mastering the Egg Drop Challenge: Tips and Tricks for 3 Egg Success

    How it's going to happen: - 1 container with 3 eggs in it (they must be placed individually in ziplock bags) - Small to medium sized eggs - 3 back to back drops from 75m - Get all 3 eggs out within 20 seconds - The lighter the container WITH the eggs the better Restrictions: - No side...
  35. D

    How to drop terms in a Lagrangian?

    Hi guys, So textbooks have it that: "Two Lagrangians differing by a total time-derivative of a function of the coordinates are equivalent". I have no idea what that means or how to use it; so I don't know which terms I can drop from Lagrangians, which is a bit of a problem. For example...
  36. C

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  37. Danger

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    Stop the presses! I've just come up with the perfect solution to the classic engineering challenge of dropping an egg from some hideous height and having it survive. Nothing that I've seen in any rules precludes it, and I can't believe that nobody has done it (or at least wasn't publicized as...
  38. T

    Egg drop experiment with a twist

    Hello, My physics class is doing the classic egg drop experiment, but with a different twist. We are asked to find the length of the bungee cord needed given a mass and a height to drop it from. The success of the lab is determined by how close we can get to the ground without touching. We...
  39. M

    How Does Voltage Drop Across a Resistor?

    Hello, I am having conceptual difficulties trying to understand how voltage is dropped across a resistor. The whole idea of it is confusing to me, where does this voltage go? Could it be explained in terms of point charges and electric fields, which is how I am able to visualize potential...
  40. DennisN

    Prince Rupert's Drop filmed at 130,000 fps

    I found this clip pretty educational and interesting. It shows the structural failure of a so-called Prince Rupert's Drop filmed at 130 000 fps (I had not heard about that concept before). Seeing the structure break down from the tail to the head at high speed is pretty amazing, I think :smile...
  41. R

    Drop Test Results: 24.75lb Weight at 1ft Height

    im trying to calculate the drop force of falling object. we do drop test at my work and believe the figures are wrong. we drop a 24.75lb weight from different heigths to check parts . they have it now set that dropping the given weight from 1 ft only produces 24.75 ft/lb force and they add 24.75...
  42. J

    Can You Engineer an Egg Drop Device to Survive a 14m Fall?

    Homework Statement I have to make an egg drop device. I was fishing for ideas. It needs to be the fastest time and survive the fall. If I win I get 4 points E.C.. Homework Equations Impulse = Ft Position function for falling object s(t) = -16t^2 +Vo + So s'(t) = -32t F = ma p =...
  43. A

    Voltage drop across capacitor in RC circuit

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  44. B

    Electric Potential Drop Across A Resistor

    Hello, As a charge traverses through a resistive circuit element it will have a certain amount of potential energy before entering the circuit element; and as it passes through, it's potential energy will decrease (due to it converting to kinetic energy, and collisions)--this I iunderstand...
  45. T

    Should I drop a course this semester (3rd year, Canada)

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  46. N

    Egg Drop Design Challenge: Straws, Index Cards and Hot Glue

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  47. C

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  48. U

    How Fast Does Water Cool in a Polystyrene Box?

    Homework Statement A cubic polystyrene box contains a litre of water at 90°C. It is 10cm wide and has a wall thickness of of 5mm. Room temperature is 25°C and the conductivity of polystyrene is 0.033W/m°C. What is the rate of temperature drop of the water? Homework Equations P=...
  49. A

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  50. T

    Shear stress and pressure drop

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