Max Definition and 1000 Threads

Homework Statement A rocket is red vertically with an acceleration of 250 m/s2. After 30 seconds, the rocket's motor shuts o. Find the maximum altitude achieved by the rocket and the total time from take-o to return to the surface of the earth, assuming that the rocket's design makes...

Homework Statement After i get the formula x = Vo2sin(2θ)/g, I was told that I can take the derivative of x and let that equal to zero to get the max range of the projectile. Why? What does taking the derivative do in order to help us find the max angle? I know that the value of the derivative...

Sorry if this had been already discussed: http://arxiv.org/abs/1008.1066 So, what I see (assuming that Universe is infinite, this is an important assumption, not proven of course, but if this is true): 1. The 'Interpretation war' is over, amen, the most important weakness of MWI has...

Homework Statement A projectile is thrown from the top of the ramp. Find the angle \theta of the throw that gives a max range R down the ramp. \phi is the angle made from the base of the ramp to the x-axis. 2. The attempt at a solution Tried a number of times but failed to get anything that...

hi, i have these 3 functions [PLAIN]http://img804.imageshack.us/img804/2230/provakd.jpg i must calculate the resultant function, and to find the max, min and the average.. i have tried to calculate it, i have found these values (max=53; min=38; average=43) but the solution in my book are...

Please help me find "Entropy and Temperature of Radiant Heat" by Max Planck I would like to read "Entropy and Temperature of Radiant Heat" by Max Planck in English. Please help me find this if you have any ideas how. Thank you!

Since I see the Big Bang was the beginning of space; if space is infinite, does that mean that space can expand at an infinite rate? (Thanks in advance from this layman; I've started Brian Greene's "Hidden Reality" and despite laymen being it's target audience, I'm stuck on this question.)

Homework Statement A cap on a steel pin has a mass of m=500g and the pin has an angle of 50 degrees from the horizontal plane. The kinetic friction coefficient between the steel pin and the cap that glides down is uk=0,1. There is a spring at the bottom of the steel pin with spring konstant...

Considering simple projectile motion, would the effect of air resistance cause the angle for maximum horizontal displacement to change? Would the maximum angle then be greater or less than 45 degrees? Just a conceptual question, don't really need equations (though wouldn't mind either).

Confused! -- Max frequency versus fundamental frequency Hello I understand the following question is very silly, however I am not sure about the answer. Let's consider we are saying there is a signal with a frequency of 4 Hz (for example). In such a statement, does it mean the maximum...

Homework Statement Find the maximum and minimum values of the function f(x) = 2sin2x-2sinx on the interval [-pi, pi]]Homework Equations first derivativeThe Attempt at a Solution f'(x) = 4sinxcosx-2cosx 0 = 2cosx (2sinx-1) 0 = 2sinx-1, sinx = 1/2, x = pi/6, 5pi/6 0 = 2cosx, cosx = 0, x = pi/2 I...

I was wondering if anyone knows a fast method of finding the maximum value in a Cuda C array. I can't get max_element to work, but not sure its very fast anyways. I know I could do a for loop, but for an array with 100,000+ elements (smallest cases) it takes a lot of time (plus it has to...

How do you calculate the maximum number of electrons with principal quantum number: a) 1 b) 2 There is more, but I list two because I want to learn how to do it. How do you show your work mathematically and what is is the principal quantum number?

Homework Statement A tunning fork with frequency f = 512 Hz is held by someone who swings it vigurously in a circle in the horizontal plane. The radius of the circle is 1.0 m, and the frequency of revolution is 3.0 rev/s. (a) What are the max and the min frequencies that a second person...

Homework Statement "A boy throws a rock with an initial velocity of 3.13 m/s at 30.0 degrees above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory?" vi = 3.13 m/s tmax height = ? vf = 0 m/s (at max height) a = -9.8 m/s2 Homework...

Homework Statement A person can jump a maximum horizontal distance (by using a 45 ◦ projectile angle) of 4 m on Earth. The acceleration of gravity is 9.8 m/s 2 . What would be his maximum range on the Moon, where the free-fall acceleration is g 6 ? Answer in units of m...

Homework Statement A toy rocket, launched from the ground, rises vertically with an acceleration of 23 m/s2 for 11 s until its motor stops. Disregarding any air resistance, what max- imum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s2 . Answer...

Hi I'm electrically-biassed, and we had a maths exam that was for both electrical and mechanical students. The last question on the paper was separated into two; one for electrical, one for mechanical. I did the electrical question (all about mean and RMS of an instantaneous voltage,)...

Homework Statement http://img196.imageshack.us/img196/3732/31591397.jpg An area slanted at an angle of 30 degrees turns aroun a vertical axis as depicted in drawing. The period time of the rotational motion is 3 seconds. On the surface is an object whose mass is 6kg. The static friction...

A simply supported beam is loaded with a uniformly distributed load (UDL) W=40 kN/m from C to D. The maximum Bending Moment value occurs at the mid-length of the beam, i.e. 3.5 m from the left hand end A. What is the value of the maximum bending moment? Give your answer in kNm, with 1 decimal place.

Hi...i have question on RLC circuit. Why my max.voltage of complex sinewave in Excel is different from the simulated complex waveform? which one is right? max.voltage of complex waveform in excel = 106.8V max.voltage of complex waveform in simulation = 126.8V Should it be the same?

Homework Statement EX=EY=5, VarX=1, VarY=sigma^2 >1 Z=aX+(1-a)Y, 0<=a<=1 find a that minimizes VarZ, and another a that maximize VarZ Homework Equations The Attempt at a Solution Not even sure where to begin *EX=5, VarX=1 thus EX^2 = 26 marginal px(x) =26/x^2 = 5/x but...

Has anyone read Max Born paper in 1926 where he proposed about the probability amplitude interpretation of the wave function? The original paper is in german. Did he mention that that "Psi is the probability amplitude for an electron in the state n to scatter into the direction m, it is, in a...

Homework Statement The beam ABCD in question is 10m long with supports at A and C. At B there is a 50KN point load and another 20Kn point load at D. The is a uniform load between A and c of 30KN/m. A is 8m from C, A is also 2m from b and d is 2m from c. I need to find the max bending...

Homework Statement Design projectile motion simulation and produce the max height, inital and final velocity, range, and time of flight. must use digital or photographic tech to record events and assist in the experiment> Okay so I've designed a half projectile motion simulation. A ramp...

[SIZE="3"]Please help PROBLEM Cable AB supports a load distributed uniformly along the horizontal as shown. The lowest portion of the cable is located at a distance a = 3.6m below support A, and support B is located a distance b = na above A. -> Determine the maximum tension in the cable as...

i don't know whether to use the yeild srength or allowable stress to determine section sizes of a beam please help me :) thank you.

Homework Statement A diffraction grating with 620 lines per mm is illuminated with light of wavelength 520 nm. A very wide viewing screen is 2.0 m behind the grating. (Note: 1 mm = 10-3 m; 1 nm =10-9 m) a) What is the distance between the two m=1 bright fringes? (Express your answer in...

Homework Statement A capacitor is formed by two concentric spheres r1= 30 cm and r2=15 cm, with a liquid insulant between them with relative permittivity Er=4. The potential difference between the spheres is 1 kV. Find: 1. capacitance 2. maximum field strength in the gap between the two...

Homework Statement During the weight-in of a truck it's been determined that the load of the weight acting on the front axis and back axis are 18 [kN] and 12 [kN] correspondingly, when the truck is empty as shown in the diagram. The max load allowed on every axis is 40.Calculate the size of...

Homework Statement See attachment. 2. Homework Equations /solution attempt Part (a) Well, the gradient evaluated at (1,2-1) will give the rate of change. If we want the maximum rate of change then we need the directional direction such that the unit vector \mathbf{u} is in the same...

A rocket of mass m=1.20x10^3 kg is launched vertically upward from the Earth's surface with an initial speed v0 = 7.00 km/s. Calculate the maximum height H of point A above the Earth's surface at which the rocket will momentarily come to rest, before it starts falling back on the earth. So I...

Homework Statement A capacitance of 60 \mu F has the voltage waveform shown in Fig. 2-36. Find P_{max}. [PLAIN]http://img828.imageshack.us/img828/5255/unled2copy.jpg Homework Equations p(t)=i(t)u(t)=\left(C\frac{du(t)}{dt}\right)u(t)The Attempt at a Solution When is power at maximum? Is it...

Homework Statement Does ||x||_inf = max | x_i | for 1 <= i <= n define a norm on R^(n) Homework Equations The Attempt at a Solution ok, I thought I understood vector spaces but this problem is confusing the heck out of me. A norm is a function that assigns a positive and finite length to...

Homework Statement Find the parametric equation of y = cos x with max at (3, 5)Homework Equations The Attempt at a Solution There aren't any examples of going from y's and x's and turning them into functions of time. They only go from time functions to y and x functions. So I'm pretty lost on...

Homework Statement A batter at a baseball game hit a ball such that it flew into the stands. The ball was caught by a fan when it was moving at 10 m/s at a height 20 m above the height it was hit. What was the maximum height to which the ball rose before falling back down towards the fan...

I've attached the question. I'm not looking for solution just general guidance on how to tackle the question. Do I calculate the internal forces? Where do I put the live load, at node 3 or the midspan of 2 and 3?

Revision that is turning into a learning from scratch session. Some help would be welcome! (I have laso put this on the materials section of engineering). - I have a hollow rectangular beam. 0.150m by 0.110m with uniform thickness walls at 0.003m. It is 3m long. - It has a modulus of...

The total profit $P, generated from the production and marketing of n items of a certain product is given by: P = -10800*n-4*n3+600*n2-166 How many items should be made for maximum profit? What is the maximum profit? Firstly, I think i would find the derivitive of the function. P'...

Homework Statement The velocity of a a rollercoaster can be described by the fomula "v(t) = -sint + 2sin2t". The interval is 0-5. At what time and what magnitude is maximum velocity achieved? Homework Equations v(t) = -sint + 2sin2t The Attempt at a Solution v(t) = -sint + 2sin2t...

Apologies for the confusingly worded title; i was trying to keep it short. If the universe reaches a state of maximum entropy (as in the Heat Death theory), why would that state be stable. Wouldnt entropy be infinite and therefore any state, including the maximumly ordered state of the Big...

Homework Statement An 8 bit ADC has a full scale input of 2.55V. If other cumulative errors are 2.55mV, determine the maximum error. Options are: 10mV, 2.55mV, 12.55mV, 7.45mVHomework Equations I believe this is a conceptual question. The only equation I can come up with is that the...

Homework Statement Find constants a, b, and c such that the graph of f(x) = ax2 + bx + c has a relative maximum at (5 , 12) and crosses the the y - axis at (0 , 3). Homework Equations Not sure what to use The Attempt at a Solution -- i don't have one --

Homework Statement Find the values of a and b if the function f(x) = 2x3 + ax2 + bx + 36 has a local maximum when x = −4 and a local minimum when x = 5. Homework Equations I'm not even sure how to start this, it's just baffling me for some reason The Attempt at a Solution i do...

I have an inductor of 500uH that is attached to a 1volt source and the other side is connected to a mosfet RDSon = 0.012 ohm. If I turn on the mosfet for 5us and let current start to flow through the inductor I can calculate the max current reached assuming the current ramps up linearly. Then...

Homework Statement Find the area of the largest rectangle that can be inscribed in a right triangle with legs adjacent to the right angle of lengths 5cm and 12cm. the two sides of the rectangle lie along the legs. Homework Equations N/a The Attempt at a Solution

Basically as the title says, what type of fusion would give the highest number of neutrons for a given amount of power. Also am I correct in assuming that most fusion methods will always produce more neutrons than other neutron sources such as americium-beryllium? (There are probably some...

Homework Statement A beach mattress filled with air has a volume of 120 L and a mass of 6.0 kg. The saline water of the Dead Sea has a density of 1240 kg/m3. Assume that the mattress retains its shape and volume regardless of load. Homework Equations What is the maximum load the mattress...

Hi, Say I have a 10x10 matrix, is there a simple code to finding the indices of the maximum value? I'm trying to use max() but there doesn't appear to be any option of actually returning the index, rather than the value. I don't need the value, just the position. Thanks, Mike

Homework Statement A 500g block is dropped from a height of 60cm above the top of a vertical spring whose force constant k = 120 N/m. Find the max. compression of the spring.Homework Equations Fsp = -kxThe Attempt at a Solution m = 500, height above horizontal = 60cm, k = 120 N/m I know the...