Figure Definition and 608 Threads

<- Paul Berg's Protein synthesis: an epic at the cellular level Chances are if you took a biology class where you learned about the cell, you saw this video when you went over protein synthesis at the ribosomal level. In the beginning of the video Paul Berg provides a very brief overview of...

I can't figure out what I am doing wrong! Getting Frustrated! Homework Statement A helium-neon laser (λ=629 nm) illuminates a diffraction grating. The distance between the two m=3 bright fringes is 33 cm on a screen 1.72 m behind the grating. What is the spacing between slits of the grating...

[SOLVED] Griffith's Figure 2.24 Homework Statement This question refers to Griffith's E and M book. In the paragraph above this figure, Griffith's says that the E-fields cancel in regions i and iii. He does NOT mean cancel completely, correct? That is, the field is NOT 0 in those two...

A Uniform pool ball mass 'm' and raidus 'r' begins at rest. It is given horizontal impulse J of fixed magnitude at a distance br above its center where -1<=B<=1. Coefficient of kinetic friction between ball and table is u. Assume both ball and table are rigid. Find an expression for the final...

Hi, I am trying to figure out what exactly a dyadic is, and how to evaluate an expression in dyadic form. I have the impression that it is related to tensors. Please let me know of any good links on the web if there are, and thanks for the help!

Ok, i have a question. I have an answer but i don't really think it sright or i am doing it right. Can anybody explain to me how to go about doing this question, and give me the answer so i can know if i am doing these kinds of questions right? Here it is: A line passes through the point...

Homework Statement (1) the torso, neck, and head (total mass = 42.3 kg) with a center of mass located on the y-axis at a point 0.423 m above the origin, (2) the upper legs (mass = 19.8 kg) with a center of mass located on the x-axis at a point 0.190 m to the right of the origin, and (3) the...

Homework Statement 1. A displacement vector has a magnitude of 810m and points at an angle of 18 degrees above the positive x axis, What are the x and y scalar components of this vector? 2. A displacement vector is 23 km in length and directed 65 degrees south of east What are the...

[SOLVED] Moment of Inertia tensor SETUP, not to difficult but can't figure it out Homework Statement a) For a cylinder of mass M, radius R and height h, calculate the inertia tensor about the center of mass. What are the principal axes? Homework Equations The Attempt at a Solution...

can't figure this one out! does anybody know why a motorcycle is more aerodynamically affected than a truck?? really thought hard about it but just can't figure it out! is it because of the two tyres?? Thanx khalid..

dy/dx= 1/(x^2-xy) I have tried all the basic steps in an attempt to make it take the form of: separable exact homogenous bernoulli linear I have tried substitution with: y=ux u=x-y u=x^2-y I cannot for the life of me figure this out, thank you for any help.

during my study on conics , I found a formula in the book regarding the classification of figure from the general equation of conics ax2+2hxy+by2+2gx+2fy+c=0 it was given that \Delta=abc+2fgh-af^{2}-{bg}^{2}-{ch}^{2} if \Delta \neq 0 then if h^{2}=ab...parabola h^{2}<ab...ellipse...

I can't figure out what I am doing for nothing! Max Torque...Please Help! Homework Statement Two small plastic spheres, one charged to 18.95 nC and the other to -18.95 nC, are connected by a 50-mm-long insulating rod. Suppose this dipole is placed a uniform electric field with strength...

I'm doing some basic factoring now to refresh my skills. On one problem, it is asking to factor: (y^2 + 8)^2 - 36 y^2 I was able to get to where I factor the trinomials: (y-4)(y-2)(y+4)(y+2) When it says to give the summary of factorization, it gives: (y^2 + 8)^2 - (6y)^2 I'm going...

[SOLVED] Made a small mistake and can't figure out what to do--&gt;Projectile motion Homework Statement Ball is launched at 62 degrees above horizontal at 22 m/s. What distance does the ball travel? Homework Equations x=x0+vx0t The Attempt at a Solution x0=0 vy0=22 m/s y0=0...

Please help - How do figure skates work...? How exactly do figure skates work? and how do the materials used help and how do figure skates improve a skaters ability to skate? any links, commments and answers would be appreicated, thank you.

Homework Statement A regular polygon of 11 sides is on an adjustable incline. The polygon has sides on 1.32 meters each. At what angle of the incline will the polygon tip over. Extra: what is the area of a cross section of the polygon. The Attempt at a Solution This problem has to do with...

Water stands at a depth D=35 m behind the vertical upstream face of a dam of width W=314 m. Find the net horizontal force on the dam from the gauge pressure of the water: I am quite lost here. I thought it would just be F=Pressure*Area =(rho*g*D)(D*W). But that is horribly wrong. What am I...

asymptotes horizontal and vertical f(x)= 2x+3/x+2 f(x)=5x/x^2+1

Homework Statement Please take a look at the attached figure. It is the function f(x,y) = x^2*y in the interval -1 =< x =< 1 and x =< y =< x+2. From the figure, is it correct that the minimum is in f(-1,-1) = -1 and the maximum is in f(1,3) = 3?

6.0221367 is a number rounded to 8 significant figures. In a question, I am asked which of these shows correct rounding off. 6.022 6.0 6.02214 Aren't they all correct? It does not specify to how many figures.

A problem in my textbook shows 25/9(20-y)^2 = 144+(20-y)^2 Then the very next step shows 16/9(20-y)^2=144 Maybe its just me, but I can't seem to figure out the algebra behind this step in the problem, any ideas on where to start? I thought about subtracting/dividing the (20-y)^2 from the...

This figure attached gives the path of a squirrel moving about on level ground, from point A (at time t = 0), to points B (at t = 6.00 min), C (at t = 12.0 min), and finally D (at t = 18.0 min). Both axes are marked in increments of 10.0 m (therefore the diagram is not drawn to scale). Consider...

The rocket, named Saturn V, was used to place humans on the surface of the Moon. It has 3 separate stages with the crew Command Module and Lunar Lander on the top. The first stage has a mass of 2 286 688 kg at launch. The stage was powered by 5 F-1 rocket engines which produced a total of 34 596...

Let's say the mass of an object is given. Then the initial/final velocity of that object. If they also tell you the time for the motion to happen, what formula could you use to figure out the power created?

Homework Statement y ' [x] = xy y[0] = 1 Homework Equations none The Attempt at a Solution I posted this somewhere else and 2 people got the answer is y = e^x I am getting something else though. I get up to here: dy/dx = xy 1/y dy = x dx ln y = (x^2)/2 + C...

Okay, here's my favorite brain teaser. Sorry if an equivalent version has appeared here before. On a remote island somewhere there was an ancient country whose population consisted of 200 people with green eyes and 800 people with blue eyes. The citizens of this country were all happy and...

Homework Statement The object in Figure P23.50 is midway between the lens and the mirror. The mirror's radius of curvature is 20.4 cm, and the lens has a focal length of -16.9 cm. http://www.webassign.net/sf5/p23_54.gif Figure P23.50 A. Considering only the light that leaves the object...

Hi all. Please kindly read the figure below and see if you can help me. Thanks.

1. I read on my physics book that "zeros located at the end of a number are not significant if they are not followed by a decimal point." it also gave an example: 3000 K, in this case, there is only 1 significant figure. However, the number 93,000,000 m, on my book it says only the first five...

I've been trying to figure this out for a while, but I can't find the right substitution: \int \sqrt{\frac{x-1}{x(x+1)}} dx Anyone able to help me out? It's driving me crazy.

Homework Statement How many revolutions per minute would a 15m diameter Ferris wheel need to make for a person to feel 'weightless' at the topmost point? Homework Equations F= mv~2/r - mg v = 2pi r/ T The Attempt at a Solution I get 8.57 m/s using the equation F= mv~2/r - mg I...

To start things off i am using DSC (Dipsersion Strenghtened Copper) 99.58% copper 0.19% Aluminum Oxide 0.16% Oxygen Less than .01% Iron Less than .01% Lead max tensile is about 10 breaking pounds or 88ksi i think for...

Homework Statement When 2 simple harmonic motions are applied to a particle at right angles to each other having time periods in the ratio 1:2, you get a figure of eight. When the phase difference is (pi)/4,3(pi)/4,... you don't get a perfect figure of eight.Can it be called a distorted eight...

Meteorities are rocks from space that fall to earth. One such rock was 41m in diameter and landed in Arizona. it had so much kinetic energy on impact that it made a crater 228m deep and 1219m in diameter. Some scientist suggest that we should invest money to locate and track these space rocks...

During construction of a hotel, all the parts of the building that are raised above ground have gravitational potential energy relative to the ground. if after many years the hotel is to be demolished all of this energy can be used to force the building to collapse on itself. if u r the engineer...

Hey everyone, I am having trouble finding out the equation I need. Could someone please walk me through finding out the Speed of a Water-Tube if it is being whipped behind a boat on a 75ft rope, and the boat is traveling at a speed of 60mph? Any help would be greatly appreciated, I've been...

Question: A ball of mass m is suspended from a string of length l. A lump of clay of mass 3m is thrown horizontally at the ball w/ a speed of v0 making a direct hit and sticking to it. Find the speed of the combined object right after the collision, and how high it rises. Answer: 3/4vo...

Homework Statement Was performing the online "reading questions" for my Physics 2 course. And I came to this question. "A wave is not a material thing but a disturbance moving through a medium. The way that it propagates is that every part of the medium it encounters begins to vibrate...

Homework Statement You dissolve an unknown quantity of weak acid HA into 50 mL of water. It only takes 1 mL of 5 M NaOH to completely neutralize the acid. The Ka of the acid is 3.2 x10^-4. What is the pH at the endpoint?Homework Equations Ka * Kb = Kw pH + pOH = 14 p(of whatever) = -log(of...

Cant figure out how to do this problem?? A person pushes a 14kg lawn mover at constant sped with a force of 88N directed along the handle, which is at an angle of 45 degress to the horizontal. (a) draw the Free-body diagram showing all forces acting on the mower. (b) Calculate the horizontal...

Hey guys. I'm wondering how to figure a grade. And if you can show me steps, so I can always be up to date on figuring it. Ok, he says this...3 exams at 22% each, final at 22% and classwork at 12% On exam 1 I got a 78/100pts. On homework, I've gotten 156/156pts. This is...

Does gravitational acceleration g vary with distance, mass, size of the object?

Sin contest question from 2003-- Can't figure this question... it's exam review! help the questions is: A kid is 5m from a fence that is 4 m high. He throws a ball @ 45 degrees from the horizontal which just grazes the fence. How far beyond the fence does the ball land? You may assume that the...

A boy throws a rock horizontally 12 m/s at a pigeon on a fence 5m away. Unfortunatley the rock the missed. By how much did the rock miss? I ve got my kinematic stuff down pat, but I just had no idea how to go about this problem. thanks for any help.

1. Homework Statement - Consider a copper wire 1 mm in diameter providing the power to run an appliance drawing 4.8 kW at 12 V. Assuming no heat radiated away from the wire while the currecnt flows, (a) what will the temperature of the wire be after the current has run for 1 second through...

We just started talking about it at school, and naturally i hav no idea what the teachers talking about! I was wondering if there are any good websites/videos online that explain it? Id be asking for a bit too much for a direct explantion from the physics buffs here :D cheeeers.

Greetings, On the board today in my calculus class, the teacher had a word problem that has stumped some other teacher, and wanted to see if we could figure it out (I realize this is the PREcalculus board, but I'm sure calculus isn't required to solve the problem). I don't remember it word...

How should I be going about this problem? Here is the question, diagram, and my work: A 50-story building is being planned. It is to be 200m high with a base 40m by 70m. Its total mass will be about 1.8X10^7 kg and its weight therefore about 1.8X10^8 N. Suppose a 200km/h wind exerts a force of...

A figure skater is spinning at a rate of 1.40 rev/s with her arms outstretched. She then draws her arms into her chest, reducing her rotational inertia to 68.0% of its original value. What is her new rate of rotation? I am having trouble starting this problem. I know that (I)(alpha)...