Max Definition and 1000 Threads

  1. D

    How Is Maximum Acceleration of a Racecar Calculated Using Physics Formulas?

    Homework Statement http://imgur.com/a/vA0H2 Homework Equations $$F=ma$$ $$r \times F = I \alpha $$ The Attempt at a Solution Denoting the forces at the back wheel with a 1 and front wheel with a 2 and calculating the torques around the CoM I have $$F-f_1-f_2 = mA$$ $$N_1 + N_2 -mg = 0$$...
  2. H

    Log inside log -- find the x in its max domains?

    Homework Statement Homework Equations log_2 x = y 2^y = x 3^2^y The Attempt at a Solution log_2 x = y 2^y = x log_2 {log _3 {log _2 { log_3 {2^y} } } } what am I suppose to do?
  3. J

    General Physics Question -- Max height of a projectile

    When an object is thrown or propelled upwards and it meets the point at deceleration and drops; what is that point called, where the object is not moving in either direction?
  4. H

    The 2 absolute equation equality? find the max and min of x?

    Homework Statement Homework EquationsThe Attempt at a Solution 2x - 1 >= 0 x >= 1/2 x - 2 >= 0 x >= 2 for x <1/2 then 2x - 1 and x - 2 are negative solve : -(2x-1) - (x-2) = 2 -3x + 3 = 2 x = 1/3 for 1/2 <= x < 2 the (2x - 1) positive, (x-2) negative solve : 2x -1 -x + 2 = 2 x = 1 for...
  5. Y

    MHB Finding a Min or Max point without knowing the function

    Hello, I have this simple problem: f(x) and g(x) are both differentiable. f is monotonically increasing for every x. g has a local min at x=0. we define h to be h(x)=f(g(x)). Can we say anything about x=0 for h(x) ? I used the chain rule to find that h'(x) = f'(g(x))*g'(x). at x=0 g'(x)=0...
  6. Pete Moore

    Particle Reynolds number / max entrained particle size

    I am not a student; this is for work. Would some kind soul: a) direct me to an online calculator to enable answering the following or b) give me the answer and show how you arrived at it :) or c) advise me of the formula / process by which I can arrive at the answer? THANK YOU! What is the...
  7. Arman777

    Max values of current and charge using differential equations

    Homework Statement Homework Equations Circuit Equations. ##U_C=Q^2\2C## ##U_L=Li^2\2## The Attempt at a Solution For (a) I said ##100J## .But I think it might be ##200J## too.Here what I did; ##U_t=Q^2\2C## and I put ##Q=0.1C## and we know ##C##.Here I...
  8. kq6up

    Time to Max Compression of a Spring

    Homework Statement [/B] A block of mass m slides down an incline with a height h. Later, it collides with a spring and compresses the spring to some maximum displacement. How long does it take to reach maximal compression.Homework Equations [/B] 1) ##mgh=\frac{1}{2}mv^2+\frac{1}{2}kx^2## 2)...
  9. E

    Why the rule of thumb: 1Mega ohm max when doing PCBs?

    My curiosity was peaked when looking at this application circuit from linear: http://cds.linear.com/image/Fig2_-_Wireless_Current_Sense_Circuit_Floats_with_Sense_Resistor.png They put two 2M resistors in series instead of one 4M resistor. I've never really used anything bigger than 470K so I...
  10. gelfand

    Drag force with differential equations, finding max speed

    Homework Statement A submarine engine provides maximum constant force ##F## to propel it through the water. Assume that the magnitude of the resistive drag force of the water experienced by the submarine is ##kv##, where ##k## is the drag coefficient and ##v## is the instantaneous speed of...
  11. Zahidur

    B Why did Max Planck quantize light?

    I've read up on the history of quantization and I can't seem to find a definitive answer on why Planck actually quantized light. Some sources say that he came up with the idea of energy being quantized in order to solve the blackbody problem, whilst others say that he was trying to create a more...
  12. D

    [Calc] First max and min values of an underdamped oscillation

    Homework Statement Determine the FIRST maximum and minimum values of the underdamped oscillation: y=e^(-x/2)(4sin(3x)+3cos(3x)) cm Homework Equations 3. The Attempt at a Solution [/B] I firstly differentiated the above equation and got: (-e^(-x/2)(22sin(3x)-21cos(3x)))/2 I checked this and...
  13. L

    Acceleration & max displacement from velocity equation

    Homework Statement The velocity of an object moving along the x-axis is given by Vx = (2.0t-t2)m/s. Initially (at t=0), the object was at the origin. a) Determine the object's acceleration at t=3.0s. b) Find the object's position at t=3.0s c) Calculate the object's maximum positive...
  14. A

    Use Max Planck's quantum theory to explain the following...

    Homework Statement [/B] Use Max Planck's quantum theory to explain the following behavior of photoelectrons. i) Low-intensity light does not release any photoelectrons. What will happen if the light is made brighter? Explain your reasoning. ii) Low-intensity light releases photoelectrons...
  15. T

    Fortran Fortran 90: Find Max & Min Values

    Hi guys, I am playing around with different functions on Fortran 90. I tried to create a simply program that would take five number that I select in a do loop and write to the screen the Max number in that list and the min number in the list. My code is below along with my output: what I...
  16. B

    Max Tolerance Stack-up: Strategies for PCBs and Blocks A, B & C

    Hi, I've been reading about stacking up tolerances. It's the first time in working with them. I understand the gist of it and I've seen a few simple examples however when I move onto my project I keep getting lost as I don't know what and where do they stack and if I should just add them up or...
  17. M

    MHB Max Value of Coefficient of Restitution for 3 Sphere Collision

    three spheres of mass 1kg,2kg and 3kg move in the same line with velocities 5i,i and 3i respectively. the smaller masses are the first to collide.if only one collision takes place find the maximum value for the coefficient of restitution between the smaller masses. what I've got so far...
  18. R

    MHB How Do You Find the Absolute Min and Max of a Function on a Triangular Region?

    Hello :) I'm struggling a bit on how I can find steps to solve problems like this, because my mind goes all over the place. Find absolute min and max of f(x,y) = 18-3x+6y on a closed triangular region with vertices (0,0), (6,0), and (6,9). I still struggle with partial derivatives and take a...
  19. F

    Understanding Absolute Max Moment: Example and Explanation

    Homework Statement In the first 2 notes , i was told that the absolute max moment will occur under the largest force lying nearest the resultant force of system . but , in the example that i have uploaded , i found that the absolute max moment will occur under the 6kN load instead of 8kN p/ s...
  20. F

    Why Is the Maximum Moment Under the 1.5k Load in Beam Analysis?

    Homework Statement For the maximum moment occur under the 1.5k load , why when we consider the left part of the beam, we just need to consider the forces 2k and 1.5k only ? Homework EquationsThe Attempt at a Solution How about FR = 4.5k and also the 1k ? Cant i just consider all of them ...
  21. B

    [Equilibrium] Max of A in Saturated Solution B

    Homework Statement What is the maximum [CO32-] that can exist in a saturated solution of AgBr? Homework Equations Equilibrium Constants, ICE tables sqrt = square root The Attempt at a Solution Ksp = [Ag+][Br-] sqrt(5.4E-13) = x (Ag and Br are in equal proportion to one another) where x...
  22. Q

    Solving for Initial Velocity & Max Height of Thrown Ball

    Homework Statement A ball is thrown upwards. Its velocity at 3/5 its max height is 16.0m/s What is its initial velocity? What is its max height? Homework Equations vf^2 = vi^2 -2g(yf-yi) define up as positive The Attempt at a Solution I ran through numerous attempts on paper but can't...
  23. R

    Kinematic equations for max height

    Homework Statement Homework EquationsThe Attempt at a Solution So (i) was easy enough and I got a time of 0.67 seconds. For (ii), since the horizontal time is 0.67 seconds this means the TOTAL time spent in air is also 0.67 seconds, so to calculate max height we split this time in half...
  24. D

    12V charging circuit between two batteries limiting max amps

    Hello, I was reading a previous thread that is now closed. What I'm curious about is a simple wiring schematic. I want to charge a battery on my trailer while it's hooked to the truck from the trailer 7 pin rv connection. The rv connection has a 12v hot all the time wire that I could use to...
  25. M

    MHB Finding the x-value of Max, Min, & Inflexion Point

    i know how to do the first two parts the x value of the max is 0 and of the minimum is 8 and 4 is the x value of the inflexion point. however i don't know how to do part 3
  26. Robertphysics

    IGBT Maximum Ratings and Protection Considerations in SMPS Designs

    I’ve been wondering about the capabilities of IGBT and Mosfets in general , I recently had a few problems with an smps and here is what I wonder , for example the IGBT used in the supply has an absolute maximum rating of 600v and 120 amps at room temp, I can’t recall the exact IGBT in question...
  27. A

    The thinnest film in which the reflected light will be a max

    Homework Statement Monochromatic light, at normal incidence, strikes a thin film in air. If λ denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a maximum? A λ/4 B 3λ/4 C λ D much less than λ E λ/2...
  28. K

    Max reaction force - ferris wheel

    Homework Statement What is the maximum reaction force exerted by a seat on the passenger of a ferris wheel? There's a diagram showing the seat at 6 o'clock, 12, 3, and 4:30... on a 12 hour clock. Homework Equations N/A The Attempt at a Solution I guess the reaction force is the normal force...
  29. Const@ntine

    "Vomit Comet" SpaceCraft (0)-V & H at Max Height

    Homework Statement Physics for Scientists and Engineers, 8th Edition, Ex. 47 M4 A spacecraft flies from 24.000 ft to 31.000 ft, in which it enters a parabolic trajectory with a velocity of 143 m/s at an angle of 45, above the horizontal. It exits with a velocity of 143 m/s at an angle of 45...
  30. J

    What is the Maximum Altitude of a Model Rocket?

    Homework Statement Hello all, I have to determine the maximum height of a model rocket. The rocket is launched at an 45 degree angle The finale velocity is 15,69 m/s (v) the extutevelocety is 14,23 m/s (c) The total mass is 180 gram (m) or m0) The emty mass is 52 grams (mf) The mass pr sek is...
  31. E

    How High Can a Dog Jump by Exerting Maximum Force?

    Homework Statement A 11-kg dog jumps up in the air to catch a ball. The dog's center of mass is normally 0.20 m above the ground, and he is 0.50 m long. The lowest he can get his center of mass is 0.10 m above the ground, and the highest he can get it before he can no longer push against the...
  32. mkematt96

    Engineering V max of a RLC Circuit. Where did I go wrong?

    Homework Statement Homework Equations Xc= 1/(wc) Xl= wl . See picture for remaining relevant equations. The Attempt at a Solution
  33. E

    Calculating steel round bar's max capacity to support?

    First off, I am new to this forum.. However I wanted To find out if anyone would be able to help me calculate How much a steel bar (2 in. In diameter, 5 ft. Lengthwise) Would be able to hold up without bending?
  34. Albert1

    MHB Finding Max and Min of $sin(x)sin(y)$ given $x+y=\dfrac {2\pi}{3}$

    $x+y=\dfrac {2\pi}{3}$ $0\leq x\leq \dfrac{\pi}{2}$ $find: $ $(1):max(sin(x)sin(y))$ $(2):min(sin(x)sin(y))$
  35. Giannakoulis

    Problem in a circular motion (find the max Frequency)

    In the figure below we put a small coin on a disc, which rotates at constant frequency f, at a distance D=0.2m by the disc rotation axis. If the coefficient of friction is μ=0.5, then what is is the maximum frequency that can have the disc so that the currency does not slip? g=10 m/sec^2 Anyone...
  36. C

    Possible Error in 1m/192cm Calculation: Is it Actually 1m/1.92m?

    Homework Statement i suspect the possible error of 100cm/192cm = 1m /192 m is wrong , IMO , it should be 1m /1.92m , right ? Homework EquationsThe Attempt at a Solution
  37. D

    I Limit to the max size of a Nucleus

    Hi Everybody, I've seen that one of the reasons that elements past 137 can't be created is because any element past 137 would require electrons in inner orbitals to go faster than the speed of light, and past 137 they would have to. I have also heard that electrons don't literally orbit the...
  38. B

    Bending Moments and max deflection

    Please could some help me get around this problem I know the derived formulas are all over the internet, but I wanted to prove it out myself. Its for a supported beam 2 end beam, worked out the max bending moment is M=PL/4. However I just can't seem to get the max deflection equation of...
  39. Titan97

    Max probability of finding an electron in 3dz2

    Homework Statement The radial wavefunction for ##3d_{z^2}## orbital is $$R=N\sigma^2e^{-\frac{\sigma}{3}}(3\cos^2\theta-1)$$ $$\sigma=\frac{r}{a_0}$$ Find r and θ for which the probabiity of finding the electron is maximum Homework Equations None The Attempt at a Solution ##R^2## gives the...
  40. V

    Max Jumping Height in Elevator Descending at Constant Vel.

    Homework Statement I work as a supplemental instructor for an intro physics class. As I was preparing my worksheet for this week I came across this problem. A basketball player can jump to a height of 55cm. How far above the floor can he jump in an elevator that is descending at a constant...
  41. Mr Davis 97

    Finding Max Velocity of Rocket Sled

    Homework Statement A rocket sled moves along a horizontal plane, and is retarded by a friction force ##f_{friction} = \mu W##, where ##\mu## is the kinetic friction constant and ##W## is the weight of the sled. The sled's initial mass is ##M_0##, and its rocket engine expels mass at a constant...
  42. C

    Find max distance of football thrown while running.

    Homework Statement A baseball player always throws a fastball at a speed of 40.26 m/s. What is the maximum distance, in meter, this player can throw the ball while running toward his teammate who catches the baseball at the same height as he throws at, assuming that this player runs at a speed...
  43. M

    Why is f Integrable on [a, b]?

    Homework Statement Let f [a, b] → R be a non-decreasing function; that is, f(x1) ≤ f(x2) for any x1, x2 ∈ [a, b] with x1 ≤ x2. So f attains a minimum value of m = f(a) and a maximum value of M = f(b) on [a, b]. Let Pn be a regular partition of [a, b] into n subintervals, each of length ∆x = (b...
  44. D

    Determining the Max. Set of Linearly Independent Vectors

    (sorry for the horrible butchered thread title... should say "determination", not "determining") 1. Homework Statement In "Principles of Quantum Mechanics", by R. Shankar, a vector space is defined as having dimension n if it can accommodate a maximum of n linearly independent vectors (here is...
  45. B

    Max Force on a single rototiller blade

    I am looking to find the max force on a single rototiller blade. The blade is being rotated at 180 RPM with 60Hp. The blade is bolted to a Flange that is welded to center shaft. The shaft has a 3.5" diameter. The diameter of the cutting circle is 24". The blade is a 10.25"x3"x.25" rectangle. If...
  46. Umar Awan

    What is the reason for using high KVA transformers in electrical heaters?

    Note: I have a feeling this is below Electrical Engineering requirements, but I couldn't find a more suitable category, so I think I'll extort the advantages of a forum base with electrical understanding more than I think may be required(ofcoarse I know very little about the field, so I may fall...
  47. C

    Why is Mohr's circle labeled clockwise and not anticlockwise?

    Homework Statement a.)why the angle θ p is in clockwise direction? why shouldn't it be in anticlockwise direction? b.) I have labelled A,B ,C and D...Why the maximum normal stress is labelled at location A? while the min stress is labelled at location B? Can I label the min and max stress at...
  48. C

    What angle will the vine break and what's the max tension?

    Homework Statement You come to a river and you see a vine you will use to swing across. Your mass is 75.0 kg, the vine is 18.0 m long, and the vine breaks when under 655 N of tension. a) at what angle from the vertical will the vine break? b) what should be the maximum tension supported by the...
  49. terryds

    Pendulum max gravity acceleration

    Homework Statement What is the ratio between maximum acceleration of pendulum oscillation and the gravity acceleration ? Express the answer in terms of L (the length of pendulum string) Homework Equations SHM The Attempt at a Solution amax = ω2 A = (g/l) L sin θ = g sin θ So, the ratio is...
  50. Nemo1

    MHB Solving Max Distance Between Supports for 2m Beam w/ Yield & Tensile Strengths

    Hi Community, I have this question which I have been able to partially answer. Part 1: From samples, we measured the Flexure Modulus of a material and was asked to solve for the deflection of the material at a $1m$ span and $1kg$ which I used Maximum Deflection = \frac{wl^{3}}{48EI} $W$ $=$...
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