What is Rise: Definition and 274 Discussions

Boston Dynamics is an American engineering and robotics design company founded in 1992 as a spin-off from the Massachusetts Institute of Technology. Headquartered in Waltham, Massachusetts, Boston Dynamics is owned by the Hyundai Motor Group since December 2020.
Boston Dynamics is best known for the development of a series of dynamic highly-mobile robots, including BigDog, Spot, Atlas, and Handle. Since 2019, Spot has been made commercially available, making it the first commercially available robot from Boston Dynamics, with the company stating its intent to commercialize other robots as well, including Handle.

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  1. T

    How high would a helium balloon rise if it never popped?

    If you released a helium balloon and if it never popped how high would it rise?
  2. J

    What temperature rise causes the transistor to saturate?tran

    Homework Statement 1. Additional Exercise 7 in the textbook (H&H, p. 110). Vout is 0.5Vcc at the quiescent point. You may assume beta = 100. The transistor is said to saturate when VC = VB. Use the fact IC grows 9%/ degree C and that VBE is constant to determine when the transistor...
  3. Mentallic

    Dense Helium Balloons: Will They Rise or Fall?

    I just need some clarification on this. It is well known that a balloon filled with helium will rise since helium is less dense than air, but what if the balloon were to stay the same weight, but the elastic itself has become much stronger, thus we could concentrate the helium even more...
  4. K

    Varying head rise in Centrifugal pumps

    Hi PF! I have a question regarding the use of centrifugal pumps. I have a system with a constant flowrate of water at 2m^3/s pumping water from a lower to a higher reservoir. The inlet condition is a head of 10m. The Height of the upper reservoir will vary from 83m in the beginning to 287m...
  5. M

    What happens when we rise a number to the power of i ?

    Hi, I have taken some math classes recently, but I feel that they opened some new questions. I am specifically unclear about complex numbers. I have understood how they can be added, divided, multiplied and subtracted algebraically, and then represented on the Argand diagram (is this the same...
  6. D

    Compute temperature rise from solar irradiance

    Homework Statement (This is not a homework problem; it comes from a real-world problem I'm trying to solve.) Sunlight is falling on an absorptive object. What will be equilibrium temperature of the object given the solar irradiance (I) and the ambient temperature? I = solar irradiance =...
  7. Islam Hassan

    Higgs Field vs Fields Giving Rise to Virtual Particles

    Is the field of the theorized Higgs particle totally distinct from those fields which give rise to fleeting virtual particles? Would the latter also have some kind of 'drag' effect on elementary particles like the Higgs is thought to do? IH
  8. Simfish

    Job opportunities at all career stages for geoscientists is on the rise

    http://www.nature.com/nature/journal/v473/n7346/full/nj7346-243a.html Hmm, what percent of these jobs will be in the private sector, and what percent in the public sector? I'd be concerned about anything in the public sector since the Republicans can easily take it away when they win control...
  9. T

    How far would a helium balloon rise if it never burst

    If you released a balloon filled with helium, how high would it go if it never burst from the pressure change?
  10. P

    Second order pole positions and rise time

    Dear All I'm stuck on something that seems to be contradictory. I was under the impression that the further the 2 closed loop poles are in a 2nd order system to the left of the root locus, the higher the damping. Surely high damping means longer rise time? But other sources say that the...
  11. T

    Calculating Rise of Mercury in U-tube with Water

    Homework Statement A simple open U-tube contains mercury. When 12.3 cm of water is poured into the right arm of the tube, how high above its initial level does the mercury rise in the left arm? Homework Equations density of water=1000kg/m^3 density of mercury=13534 kg/m^3 The...
  12. P

    What will happen to capillary rise effect if we take capillary to

    what will happen to capillary rise effect if we take capillary to space g=0?
  13. D

    Survivable Birth Defects and the Rise of Mutants

    I hope this isn't a half-baked question but it's in regard to recent news stories about massive rises in birth defects in the Iraqi city of Fallujah since the US assault in 2004, for example http://www.guardian.co.uk/world/2009/nov/13/falluja-cancer-children-birth-defects and the possibility of...
  14. D

    How fast does hot air rise and disperse?

    I know there have been some forums here about hot air rising, but I'm curious - how fast does hot air rise? Also, how fast does it disperse? If we consider steam, for example, rising and dispersing horizontally from a boiling pot of water. Does anyone know some (hopefully simple) equations to...
  15. D

    How Do Spinning Tops and Suspended Magnets Exhibit Surprising Physics?

    When you release a top with high speed, it rises for an instant. Why is this? I've also seen magnets spinning madly when suspended above superconductors. Are these observations related and is there an explanation for this? Many Thanks, :)
  16. S

    What gave rise to cosmic inflation of the early Universe?

    What gave rise to cosmic inflation of the early Universe?
  17. T

    2NOR gate rise and fall time question

    Homework Statement True or false: a two input nor gate is designed to have the same worst case rise and fall times. The best case fall time is smaller than the best case rise time in this gate. Homework Equations - The Attempt at a Solution The second part i get, the best case fall...
  18. C

    Calculating Reaction Rate Increase with a Temp. Rise of 10degC

    Homework Statement By what factor would the rate of a reaction for which the activation energy is 159 kJ be increased by a temperature rise of 10degreesC from 25 to 35degreesC? Homework Equations The Attempt at a Solution
  19. V

    Rise of Water in a 20 cm Capillary Tube

    hello :) Homework Statement (Q)A 20 cm long capillary tube is dipped in water.The water rises up to 8 cm . If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be <a>8 cm <b>6 cm <c>10 cm <d>20 cm Homework Equations...
  20. B

    Harry Potter and The Rise of Valkryia Fan Game

    Introductory Narrative: This is a story game where the posters of the thread will think up creative responses to the threats posed by the antagonists in the story. The succeeding chapters will be provided and act as an expansion pack for the game, just like an online RPG. When the poster...
  21. T

    Simple harmonic motion rise and fall of water

    Homework Statement The rise and fall of water in a harbour is simple harmonic. The depth of water varies between 5.0 m at low tide and 9.0 m at high tide. The time between sucessive low tides is 12 hours. A ship, which requires a minimum depth of 6.0 m approaches the harbour at low tide, how...
  22. M

    Capacitor as voltage rise potential

    I was thinking about the function of a capacitor on a very basic level, and it occurred to me that the capacitor also resembles the high voltage electrostatic generator. There is the std LC circuit but that behaves as an AC signal. A capacitor will not build its charge without some potential...
  23. R

    Help with Capillary Rise Equation for Differential Equations Class

    Hey guys, I have a problem in one of my classes where I need to make an equation of capillary rise in a strip of paper towel. I am given data points and I need to make an equation that fits the points. Can someone please help me through the physics and derivation behind this. I tried doing some...
  24. Siv

    Medical Rise of Cancer: Examining the Role of Sugar and Refined Carbs

    I think evidence is increasingly suggesting that an explosion of sugar, HFCS and refined carb consumption has led to the huge increase in incidence of cancer in the past few decades.
  25. Z

    Capillary Rise and Pressure in Sealed Capillary Tubes

    Will there be any difference in capillary rise if the capillary tube is sealed at one end? What is the value of pressure at a point in the capillary tube on the same horizontal level as that of liquid outside? - Is it equal to the atmospheric pressure + the height of liquid column above it?
  26. W

    The rise of unschooled children

    Is this a good or bad thing? http://abcnews.go.com/GMA/Parenting/unschooling-homeschooling-book-tests-classes/story?id=10410867 https://www.youtube.com/watch?v=XEUzsooa1JE
  27. G

    Does the water level rise when a boat sinks?

    Homework Statement An aluminum boat is floating in a swimming pool. A hole opens up in the bottom of the boat, and it sinks to the bottom of the pool. Does the water level rise, fall, or stay the same?Homework Equations (Is the buoyancy equation applicable here?)The Attempt at a Solution...
  28. F

    Engineering RC Circuit Rise Time: 1k-1000k | V=5V | C=0.01uF

    Homework Statement Calculate the rise time (the time require for the output to go from 10% to 90% of its final, or steady state, value) for the circuit shown above when a step input of 5V is applied for the following resistor values: 1k, 10k, 100k, 1000k with C equal to 0.01uF...
  29. J

    Why do we take slope as rise over run?

    Why do we take slope=rise/run (or y/x)? Is it just a definition, or does it have a special significance? Why can't we take slope as run/rise (i.e. x/y)?
  30. Q

    Calculating temperature rise of aluminum wire

    I am interested in calculating the temperature rise of a 10 mil aluminum bond wire. Assuming relative purity of the wire, I feel like I should be able to use the method I have worked out below. If anyone can advise on the accuracy of my method, it would be greatly appreciated. Method: 1...
  31. A

    Solving for Pressure Rise in Manometer with Oil & Mercury

    Homework Statement A manometer using oil (density 0.91 g/cm3) as a fluid is connected to an air tank. Suddenly the pressure in the tank increases by 0.72 cm of Hg. (a) By how much does the fluid level rise in the side of the manometer that is open to the atmosphere? (b) What would your...
  32. K

    U-shaped tube- how far does the mercury rise when water is poured into one side?

    U-shaped tube-- how far does the mercury rise when water is poured into one side? Homework Statement A U-shaped tube containing mercury is open to the air on both ends. Water is poured into one arm until the water column is 15.0 cm deep. How far upward from the initial position does the...
  33. 6

    How to measure voltage rise delay and fall delay?

    In Cadence we built a CMOS inverter. I made a transient response graph showing the input and output voltage waveforms. We're supposed to measure rise delay and fall delay of the output voltage. How do I do this? I heard from someone else that it's where the graphs cross 1.5V, but I'm still...
  34. K

    Calculate the maximum height that m1 and m2 rise after collision?

    Homework Statement Consider a frictionless track. Imagine point A to B is one quarter of a circle; point B to C is a horizontal flat plane; point C to D is also one quarter of a circle. The block m1 is released from A. It makes a head-on elastic collision at B with m2 (that is initially...
  35. C

    Temperature rise in power transformers atheistrical

    The post "Temperature rise in power transformers was locked, however there may be a simple safe answer. The post said the winding temperature was 73 deg C. 73 deg C is safe for winding temperature. If it was winding temperature RISE of 73 deg C, then there may be problems. So which was it?
  36. A

    Temperature rise in Power Transformer

    The following transformer gets overheated and I was looking for most probable the causes associated with it. 1. Rating : 7.5 MVA, 0.85 power factor, Power Transformer (Manufacturer - Kirloskar) 2. Connected Load : Upto 6 MW 3. Oil Natural Cooling System 4. Normal Atmospheric Temperature ...
  37. Spinnor

    Energy flux in sun gives rise to polarization of plasma in sun?

    In the energy producing region of the sun there is a large radial flux of high energy photons. Does this outward flux polarize the plasma and give rise to a electric field in this inner region? What is an order of magnitude estimate of this field? As the sun rotates this field gives rise to a...
  38. R

    Tempreature Rise In Gases On Compression

    This is actually related to Thermodynamics but as it comes directly under the Mechanical field I'm asking it here and I invite all my fellow Mechanical Engineers and Physics Experts to answer this. The question is : How does the Tempreature of a gas change (increase) when the gas is...
  39. P

    How to find maximum temp. rise from a velocity value

    Homework Statement Wind (dry air, so R=287 Jkg^-1K^-1) is moving isobarically along a flat surface at 30m/s. It hits a forest and 3/4 of its kinetic energy is transformed into heat energy by friction. What is the maximum temperature increase that could occur? Homework Equations...
  40. L

    How high does the ball rise?

    Homework Statement A tennis ball is shot vertically upward in an evacuated chamber(neglect air resistance) with an initial speed of 20m/s at time t=0s. How high does the ball rise? A)98.0m B)72.4m C)20.4m D)10.2m E)40.8m Approximately how long does it take the tennis ball to...
  41. P

    What causes the potential (voltage) in a conductor to rise?

    I noticed a couple of similar threads, but I thought it might be better to start a new one for clarity. Imagine a simple DC circuit with a static (time invariant) source of potential and a closed circuit with a simple conductor. If you were to trace the potential from the negative terminal...
  42. G

    Calculating Buoyancy Rate of Rise for a Ship

    Can someone give me a formula or give an approximate approach to calculating the time it would take for an object to be raised up (due to buoyancy) from a certain depth of water? For instance, take a ship (say it weighs 300,000kg and it's a rectangular shape with surface area of 100m square...
  43. A

    Oil Prices Rise Despite Economic Woes

    With the economy still in the tank, why are oil prices going back up?
  44. L

    Nothingness and the rise of something

    I have recently read a few articles by physicist Victor Stenger and about his book The Comprehensible Cosmos: Where Do the Laws of Physics Come From? and it seems he has a fascinating answer to the ancient question of "Why is there something rather than nothing?". Since I am not a scientist I'd...
  45. B

    Artificial intelligence - the rise of machines

    Hi all, :smile: Technology has advanced phenomenally in the past few decades or so. A particular point of concern…….yeah that’s right!, ‘concern’ is the massive advent in Artificial Intelligence (AI) technology. Softwares so powerful that it will decide the fate of mankind! Maybe, the...
  46. S

    Projected temperature rise of insulated ice block

    OK, I am attempting to calculate the reuirements for creating a 3-ton, 90-day air conditioner using nothing but ice and an exchange loop between that ice and a heat exchanger in my house. I can calculate everything except knowing how much I can practically insulate a storage vessel, and, given...
  47. Ivan Seeking

    Rise of Tent Cities in U.S.A.

    Tent cities are springing up. https://www.youtube.com/watch?v=CnnOOo6tRs8 Also http://www.knx1070.com/-Tent-City--Rapidly-Growing-in-Sacramento/3975097 This is reminscent of the Shanty Towns that emerged during the great depression...
  48. S

    Solving a Physics Quiz: Calculate the Temperature Rise

    My Physics teacher gave us a quiz problem and I don't understand it really how he got his answer. Can you please give me your answer and an explanation for the answer Thanks. Here is the question: A .5 kg rock is dropped from a height of 20 meters into a pail containing .6 kg of water. The...
  49. S

    What is the is the rise in temperature of the rock

    My Physics teacher gave us a quiz problem and I don't understand it really how he got his answer. Can you please give me your answer and an explanation for the answer Thanks. Here is the question: A .5 kg rock is dropped from a height of 20 meters into a pail containing .6 kg of water. The...
  50. P

    Energy question - How much will this rope swinger rise

    Homework Statement JayJay is running topspeed of 8 meters/seconds, he grabs a string handing vetical fr. a tall-tree. how high will he swings upwards,b.does the length of the string affect the total height?c. if it tkaes him 2s to reach that height, how long is the string.d.explain why the...
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