Magnitude Definition and 1000 Threads

Homework Statement A 2 kg mass hangs from the end of a 1 meter long string which is Øxed at its other end. The mass is displaced so that the string is at 53° to the vertical and released (remember sin(53°) = cos(37°)=0.8). Find the magnitude of the total acceleration of the mass when the...

1. A person is pulling a heavy cart up a hill. The cart has 400 kg of mass inside it. The person is pulling the cart with 10 N of force. What is the magnitude of the force on the person due to the cart? 3. Is it 4000N?

Homework Statement I want to know the steps involved in finding the magnitude of a complex exponential function. An example of the following is shown in this picture: Homework Equations |a+jb|=sqrt(a^2+b^2) |x/y|=|x|/|y| The Attempt at a Solution For the denominator, I replaced z with e^jw...

So, last week I was working with a raman microscope, specifically using it in a photoluminescence experiment, and for about 20 minutes I was suddenly getting responses a couple of orders of magnitude higher than I did before or after. What's even stranger is that the guy on the desk across...

Homework Statement A child pulls a wagon at a constant velocity along a level sidewalk. The child does this by applying a 22-Newton force to the wagon handle, which is inclined at 35° to the sidewalk. What is the magnitude of the force of friction on the wagon? Homework Equations Ff =...

The figure (http://tinypic.com/r/vo5ssm/6) shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. What is the magnitude of the electric field at t = 3.34 × 10−10 s? What is the magnitude of the magnetic field at t = 6.0 × 10−9 s...

Finding acceleration of box-- given mass of box and magnitude of frict Doing homework and stuck on this question. A student pushes a 10kg box and let's it slide across the floor. The magnitude of the frictional force acting on the box is 40 N. What is the acceleration of the box? Relative...

Homework Statement What happens to the gravitational field strength's magnitude if a) r decreases by a factor of 4? b) r increases by factor of 2 Homework Equations i'm not sure which equation they are referring to? it may be g ∝ 1/r^2The Attempt at a Solution I tried to do this: 1/ (r-4)^2...

1. If a = 3.0 mm, b = 4.0 mm, Q1 = -60 nC, Q2 = 80 nC, and q = 30 nC in the Figure Q1, what is the magnitude of the electric force on q? 2. F = kq1q2/r^2 Coulomb’s Law 3. Answer is F=1.0N I'm a beginner in electrical study, i stuck on the net force. My steps are: F1=kQ1Q2/a^2 , F2= kQ2q/r^2

I'm in physics 1 in college and reviewing for an up comming exam, ran into this problem and can't seem to figure out how to solve it. A 70 kg skydiver experiences a drag force as a function of velocity (in m/s), opposite the direction of motion, whose magnitude is given Fd(v)=0.19v^2...

Homework Statement what is the magnitude of the electric field intensity at a pont in the field where an electron expeeriences a 1.0 Newton force? Homework Equations F = q*E The Attempt at a Solution 1.602*10λ-19 * 1.0 1.602*10λ-19

Hey PF, I'm just being stupid today, because I can't figure out the way HR diagram is constructed, hope you guys can help. So suppose that you complete an observation in several different filters, and you need to work out the luminosity and temperature for each object in your field of view...

Consider a fissile element whose magnitude is at the order of a neutron. In this situation, how can we derive the point kinetic equations? Thanks everyone.

Homework Statement Vectors A and B are shown in the figure. Vector C is given by C=B-A. The magnitude of vector A is 15.0 units, and the magnitude of Vector B is 5.00 units. Part a) Find the vector C? Part b) What is the magnitude of vector C? Homework Equations SOHCAHTOA...

1. Homework Statement [/b] So I found this problem online, and I really do not know how to go about solving it! My professor has done similar problems in class, but it's still a little confusing. A current of 1.2 A flows from A to B. Therefore, the magnitude of the potential difference...

A mass of 130 g is held by a horizontal spring constant 22 N/m. It is displaced from its equilibrium position and released from the rest. As it passes through its equilibrium position, its speed is 4.2 m/s. a) find work done on the spring. w=1/2mv^2 1/2(.13kg)(4.2)^2= 1.14 (correct) b)...

Homework Statement I've been asked to estimate ωn and ζ from the magnitude and phase plot of an atomic force microscope. The magnitude and phase plot is attached. Does anyone know how to solve for these values?

"Voltage across" a magnitude? If a problem says to find the "voltage across" a resistor, is that always a magnitude?

You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 45.0 N*m. Using the data in the figure below (L = 0.300 m and ? = 52.6°), determine the magnitude F of the force that you must exert on the wrench. Relevant...

Hey yall. This is a question from my homework but it's so basic that it's just to help with the concept for me. So the question is this: A small object A, electrically charged, creates an electric field. At a point P located 0.250 directly north of A, the field has a value of 40.0 directed to...

Homework Statement A rod lies on the x-axis with one end at the origin and another at x=2. The linear charge density is given by λ(x)=C(x^(3) + 3x^(2)). Find the x-component of the electric field Ex at the origin in terms of q. Homework Equations Ex = ƩdEx ||dE||= (k|dq|/r^(2)) (z/r)...

Homework Statement A 2.4-lb slider is propelled upward at A along the fixed curved bar which lies in a vertical plane. If the slider is observed to have a speed of 11.3 ft/sec as it passes position B, determine (a) the magnitude N of the force exerted by the fixed rod on the slider and (b) the...

Homework Statement Two long, parallel wires carry currents of I1 = 2.78 A and I2 = 4.80 A in the direction indicated in the figure below. (Choose the line running from wire 1 to wire 2 as the positive x-direction and the line running upward as the positive y-direction.) a) Find the magnitude...

Homework Statement A block of mass 100g is at rest on a rough horizontal plane. It has a massless rope attached to one end inclined at 20° above the horizontal. When the tension in the string is 0.5N the object is found to be in limiting equilibrium. Part A: Find the coeffecient of static...

Three point charges are placed at the vertices of an equilateral triangle (of side .2m). The triangle is setup on an X-Y plain. On the top of the triangle on the Y-axis the charge is q7= -7μC, the positive X-axis the charge is q3= 3μC, and on the -X-axis the charge is q2= 2μC. Part A). What...

Homework Statement A telescope with aperture 10 times the human eye could see stars down to magnitude? Homework Equations I was not given an equation with the question but I have found the following but I do not know if it is correct. M=Log(2.51188)*(A2/A1)^2 The Attempt at a Solution A1=...

Homework Statement A large, flat, horizontal sheet of charge has a charge per unit area of 3.15 µC/m2. Find the electric field just above the middle of the sheet.Homework Equations dq = \sigma dA \oint \vec{E} \cdot d\vec{A} = \frac{q_enc}{\epsilon_0} \epsilon_0 = \frac{1}{4 \pi k_e} The...

Homework Statement Given: Spherical blackbody with surface temperature of 30000K radius of 6.0 x 10^9 m located 123pc from earth Homework Equations Find the absolute and apparent bolometric magnitudes The Attempt at a Solution My camera needs batteries so I cannot post my work...

On a spacecraft two engines fire for a time of 572 s. One gives the craft an acceleration in the x direction of ax = 5.15 m/s2, while the other produces an acceleration in the y direction of ay = 7.41 m/s2. At the end of the firing period, the craft has velocity components of vx = 3782 m/s and...

Homework Statement A hollow conducting spherical shell has an inner radius of 8 cm and an outer radius of 10 cm. The electric field at the inner surface of the shell, Ei, has a magnitude of 90 N/C and points toward the centre of the sphere, and the electric field at the outer surface, Eo...

Homework Statement The electric field strength across a typical cell membrane is about 107 N/C. Given this information, find the magnitude of the acceleration of a single charged Ca+1 ion as it penetrated throught the cell wall. Ignore any resistive forces. One atomic mass unit is 1.66 x...

[b]1. A bicycle is placed on a service rack with its wheels hanging free. As part of a bearing test, the front wheel is spun at the rate of N = 59 rev/min. Assume that this rate is constant, and determine the speed v and magnitude a of the acceleration of point A. I have attached an image...

QUESTION A star of bolometric luminosity L at a distance r will exhibit a bolometric energy flux F given by F = L/4πr2 in the absence of obscurity. A. Assume that all stars have the same bolometric luminosity L and that stars are uniformly distributed in space with a number density n...

I was wondering how to calculate the magnitude and phase response of any circuit that is neither Low-Pass,High Pass nor Band-Pass. I am asking this because i haven't found anything relevant in any textbooks so far , since the only use standard filters. e.g an AC circuit consisting of an AC...

Homework Statement H(e^jw) = (1-1.25e^(-jw))/(1-0.8e^(-jw)) Prove |H(e^jw)|^2 = G^2, and what is G Find Magnitude & Phase Homework Equations H(e^jw) = (e^(jw)-1.25)/(e^(jw)-0.8) H(e^jw) = 1 - (0.45e^(-jw))/(1-0.8e^(-jw)) H(e^jw) = 1 - 0.45/(e^(jw)-0.8) The Attempt at a...

Three students converge on the last textbook in the store. All three grab it and begin to pull in the directions shown in the above figure. Student A exerts a force of 61.88 N, student B pulls with a force of 31.92 N, and student C pulls with a force of 104.20 N at an angle θ(theta)=80.8 degrees...

Homework Statement A wheel changes its angular velocity with a constant angular acceleration while rotating about a fixed axis through its center. Show that the change in the magnitude of the radial acceleration during any time interval of a point on the wheel is twice the product of the...

1. Are the spring forces at both ends of a spring always equal in magnitude? 2. If yes, then the external forces at both ends are also the same in magnitude, aren't they? (Based on Newton's third law) If no, how to find the two different spring forces at each of the end? 3. If the...

Homework Statement For the dipole shown, the charges are ± 3.0 micro coulombs separated by a distance of 3.20 nm and oriented so that the theta is 35.0 degrees. If the electric field has a magnitude of 8000 N/C, find the magnitude and direction (clockwise/counterclockwise) of the net torque...

Homework Statement A conducting bar of length is placed on a frictionless inclined plane which is tilted at an angle θ from the horizontal, as shown in annexed figure. A uniform magnetic field is applied in the vertical direction. To prevent the bar from sliding down, a voltage source is...

Homework Statement Homework Equations F = \sqrt{F_x^2 + F_y^2} tan\theta = F_y / F_x The Attempt at a Solution Page 1 : http://i49.tinypic.com/vfw74k.jpg Page 2 : http://i50.tinypic.com/2qspamr.jpg Page 3 : http://i49.tinypic.com/24zgl6x.jpg is it correct?

Homework Statement A canoe has a velocity of 0.35 m/s southwest relative to the earth. The canoe is on a river that is flowing 0.65 m/s east relative to the earth. Find the velocity (magnitude and direction) of the canoe relative to the river. The Attempt at a Solution 0.930985 is the...

Homework Statement Revered Members, Please go through my attachment. I have been asked to find the magnitude and direction of current through the 10 ohm resistor. The answer that is given in the book is 1/23 Ampere from A to B. But i solved as given in the attachment but i got the answer...

All, I've been beating my head up on this equation, so I thought I'd try here to see if someone could help me. In the equation (sqrt{32}(2x-d))^-4 = (-d/2 - 1/2 )^2 + sqrt{(1+d)^2 + d/4}/4 Where the right hand side is my attempt to solve for d out of the magnitude |z| of a complex...

I will keep working on this while waiting for someone here to respond... Homework Statement A ball m= 0.0024kg is electrically charged when 1E11 electrons are added. The ball falls with a=3.13m/s2 in an electric field. Find magnitude and direction of field. Homework Equations q= Ne The...

A force F of magnitude 12 N, Please help! A force F of magnitude 12 N has componenets P and Q. The sum of the magnitudes of P and Q is 18 N. The direction of Q is at right angles to F. Find the magnitude of Q. I am not able to visualize the drawing. My question is this. I know the sum of two...

I am reading Kolenkow and Kleppner's Classical Mechanics and they have tried to calculate the gravitational force between a uniform thin spherical shell of mass M and a particle of mass m located at a distance r from the center. The shell has been divided into narrow rings.R has been...

How to calculate the visual magnitude of a star having only the flux of such star? The equation involves 2 magnitudes and 2 fluxes, corresponding to 2 objects a and b: ma-mb= -2.5log10\left( \frac{F_a}{F_b}\right) but I just have Fa and I have to obtain ma. Is it valid to take...

Hello This is my first post here. Although I've often read posts in Physics Forums, I've never actually contributed anything - so here goes! I always enjoy a good hand-waving argument on orders of magnitude; when I first started my astrophysics degree, one homework question was "estimate...

Homework Statement Two cars leave the same point at the same time, each traveling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the...