Magnitude Definition and 1000 Threads

Homework Statement Which of the following statements are true about Fs, max in the equation mu=Fs, max/Fnormal? I. Fs, max is exerted perpendicular to the surfaces in contact. II. Fs, max represents the maximum value of the force of static friction. III. On a level surface, the magnitude of...

Homework Statement To move the oil drum, the resultant of the three forces shown must have a magnitude of 500 N. Determine the magnitude and direction of the smallest force F that would cause the drum to move. here is the figure: http://screensnapr.com/e/yliMVN.png Homework...

A(n) 0.445 kg football is thrown with a speed of 15.1 m/s. A stationary receiver catches the ball and brings it to rest in 0.012 s. What is the magnitude of the impulse de- livered to the ball? Answer in units of kg · m/s f=m*a Δp=m*Δv i used f= ma since a= Δv/t i got F=...

Homework Statement A wagon is drawn by a student pulling with a constant force of F Newtons applied at an angle of θ° to the horizontal. If the wagon is drawn in a circle with radius r meters, how much work is done on the wagon? (I don't remember the actual numbers) Homework Equations...

a 4kg magpie flies towards a very tight plastic wire on a clothes line. the wire is perfectly horizontal and is stretched between poles 4m apart. the magpie lands on the center of the wire, depressing it by a vertical distance of 4.0cm. what magnitude of tension is in the wire?

A scalar has magnitude and no direction; a vector has both direction and magnitude. Is there a name for a physical or mathematical object with direction but no magnitude? I guess a description of it could be something like \lim_{\|v\|\to 0} \vec{v}

Homework Statement Compute the magnitude of the displacement (\vec{}R and the angle with respect to the x-axis. Homework Equations The Attempt at a Solution A = 10m * sin30° \hat{}y+ 10m * cos30° \hat{}x \vec{}A = 5m \hat{}y + 8.66m \hat{}x B = 15m C = 20m * sin80°...

Homework Statement Given two vectors A=9i+1j+9k and B=12i-12j+10k find: a) Their dot product AB b) Their cross product AxB c)The angle between the vectors A and B d) a vector C that is parallel with A and has the same magnitude as B e) A vector C that is perpendicular to A and has the...

Homework Statement A 200N block is on a 35 degree incline with a frictionless, massless pulley and a weight on the other side, Fw= 220. The system is in equilibrium. What are the magnitude and direction of the frictional force on the 200N block? Homework Equations and The Attempt at...

This is actually not a full problem, just a part of one I'm having trouble with: Homework Statement If I have a acceleration vector, say [ bk^{2}e^{kt} - bc^{2}e^{kt} ]e_{r} + [ 2bkce^{kt} ] e_{θ}. How can I find its magnitude? Homework Equations Mag vector |a| = (a^2)^(1/2) The Attempt...

is that both of absolute and apparent magnitude counts only visible light? since i found some books said absolute magnitude counts luminosity instead of intensity, where luminosity includes also the non-visible frequencies. thank you!

Here's the question: A bird drops a seed, which falls with a steady vertical terminal velocity of 4.8 m/s. A slight breeze blows the seed toward the west at 1.2 m/s. (a) What is the magnitude of the resultant velocity of the seed? (b) What is the direction (in degrees west of the...

Homework Statement There are three point charges, q1 has a magnitude of 3.00mC (the sign is not known) and is 5.0cm away from P and 13.0 cm away from q2. P is 12.0cm away from q2 and the three points form a triangle. The net electric field at point P is entirely in the negative y-direction...

An insulating solid sphere of radius a = 1.2 m is uniformly charged with charge Q = 4.5 x 10^-6 C. Point P inside the sphere is at a distance r = 0.60 m from the sphere center C. What is the magnitude of the electric field at point P? So I'm using Gauss' Law: q,enc = Q[(pi * r^2)/ (pi *...

Homework Statement A binary star system consists of a hot main sequence star (m=0.5m) and a red giant (m=1.2m), the parallax of the system is p=0.0012". Calculate the apparent magnitude of the system. Homework Equations I have b1/b2 = 2.512^(m2-m1) and p=1/r The Attempt at a...

Homework Statement CD is playing for 74 min, starts at angular speed of 480 rpm then slows to 210rpm. what's the magnitude of the angular acceleration Homework Equations angular acceleration =ω/ t The Attempt at a Solution i converted the rev to rad then min to sec then divided...

Homework Statement The resultant vector of the four displacement vector A B C D is 1000m, with direction 60° N of W. The three vectors A B C are: A=200m,S B=300m,45° S of W C=400m,30° E of N a.) Find the magnitude of the fourth vector b.) find the direction of the fourth vector Homework...

How does one find the value of ||A \left(\hat{\imath}\wedge\hat{\jmath}\right) +B(\hat{\imath}\wedge\hat{k})+C( \hat{\jmath}\wedge\hat{k})|| Where A, B and C are constant coefficients. Thanks in advance.

Hi, Four point charges of equal magnitude are held at the corners of a square. The length of each side of the square is 2a and the sign of the charges are the following: Two positive charges on the top two corners of the square and two negative charges on the bottom two corners of the square...

Someone who knows what they are talking about: Show what the magnitude of induced emf Homework Statement Consider a magnetic field B = K(x3z2,0, -x2z3)sinωt in the region of interest, where K and ω are positive constants and t is variable time. Show that the magnitude of the induced emf...

[PLAIN]http://www.tumblr.com/photo/1280/12942474909/1/tumblr_lutva4tbpB1qml28n

I am trying to find out how fast a star's magnitude changes over time, and have two columns of data. The first is the time since the stay left the main sequence, and the second is Log (L/L_sun). I am unsure as to how to chance the luminosity values into magnitudes, which means I can't answer...

Homework Statement A car needs to generate 75 hp in order to maintain a constant velocity of 27.3m/s on a flat road. What is the magnitude of the total resistive force acting on the car. (due to friction,air resistance etc.) Homework Equations 1hp=746 watts The Attempt at a Solution...

Homework Statement A) Find the magnitude of the magnetic field 10 cm away from the wire at point P as shown in the picture. The current is directed along the x-axis. B) Find its direction Info: I = 5 amps. Point P lies on the Y-axis. Current on the X-axis. Picture (I have drawn)...

I have calculated magnitude of acceleration of an object slowing to a stop to be: -5.1m s^-1. I then had to find the magnitude of the unbalnced force applied to the object for it to stop which i found to be: So F= 1500 kg * 5.1 m s^-2 Which equals 7650kg m s^-2 Which...

I understand that having a periodic signal x(t) we can find a signal y(t) which uses harmonically related exponentials in order to construct the x(t) signal each exponential has a frequency and magnitude, for example 3*e^{j 2 \omega} has a frequency of \frac{2 \pi}{2 \omega} =...

Gravitation Force (Solved, thanks) Homework Statement A sphere with mass of 65kg and center at origin. Another sphere with mass 79kg at point (0,3), also centered at origin. A.) What is the magnitude of the net gravitational force due to these objects on a third uniform sphere with mass...

Hi all, I was diving into my 3rd year quantum assignment and I saw the following which I have to use for the rest of the question to prove the Cauchy-Schwarz inequality: Homework Statement || a|x> + b|y> ||^2 I only really learned a bit about Dirac notation last year, so please...

Homework Statement The Pilot of an airplane executes a loop-the-loop manuever in a vertical circle. The airplane's speed is 300 mi/h at the top of the loop and 450 mi/h at the bottom. The radius of the circle is 1200 ft. Use American Engineering units in this problem. A) The pilot's...

Find Force Magnitude Problem...Please Help! Homework Statement 1. You Push a block of mass 3.00 kg against a vertical wall by applying a force of magnitude P at an angle of 50.0 degrees above the horizontal. The coefficient of static friction between block and wall is 0.250. Determine the...

An isolated segment of wire of length L=4.50 m carries a current of magnitude i=35.0 A at an angle theta=50.3 degrees with respect to a constant magnetic field with magnitude B= 6.70E-2 T. What is the magnitude of the magnetic force on the wire? a) 2.66 N b) 3.86 c) 5.60 N d) 8.12 N e) 11.8...

Homework Statement Given the initial (u) and final (v) velocities below, find the magnitude and direction of the changes in velocity: Homework Equations (a) through (f) - I only have trouble with (e) and (f) (e): u = 10ms east, v = 15ms N40°W (f): u = 250ms N20°W, v = 200ms south...

Hi =) just signed up, and i really need help this term. I am really having a hard time this term absorbing what's going on, I am getting things mixed up, and I am falling behind.. I am finding myself quickly losing my confidence and becoming quite frustrated and stressed out ;( I am really...

Homework Statement A DC circuit which includes Emfx of unkown magnitude and orientation, at the location indicated is shown below. Note the 'ground' (V=0) in the circuit. The potential between 'b' and 'a', Vb-Va, is measured to be 2.00 V. a) The magnitude of Emfx is: b) Calculate...

Homework Statement There is a non-conducting charged rod with length L=.0815(m) and linear charge density λ=-5.9x10-14(C/m). The rod is placed parallel to and on the x-axis, and at a distance a=.12(m) from the right-most end of the rod is point P. Calculate the magnitude and direction of E...

Homework Statement The neutral neptunium atom has 93 electrons. What is the magnitude of its electric field at a distance of 6.5x10-10 m from the nucleus? Hint: The number of protons in a nucleus is equal to the number of electrons in the neutral atom. q = 1.6e-19 * 93 = 1.48e-17...

I haven't done anything Physics related in 2 years (high school) and am trying to get back into being familiar with Physics, Science, and mathematical terms for an upcoming class. Homework Statement A gazelle starts from rest and runs in a straight line 29° north of west. After 36s of...

Homework Statement a woman is straining to lift a large crate with no sucess. its too heavy. we denote the forces on the crate as follows: P is the upward force on the crate by the person. C is the contact force on the crate by the floor and w is the weight. how are the magnitudes related...

Homework Statement A factory worker pushes a 30.0-kg crate a distance of 4.5. along a level floor at constant speed by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25. (a) What magnitude of force must the worker apply? Homework...

Homework Statement A woman pulls on her suitcase with a force of 105N at an angle of 38 degrees above the horizontal. The coefficients of static and kinetic friction between and suitcase and the floor are 0.273 and 0.117. The mass of the suitcase is 36 kg. what is the magnitude of the normal...

Let's say you are given two vectors, A and B. How would you find a new vector with the same magnitude as A and the same direction as B. I don't understand this concept. I tried approaching it using vector projections but it didn't feel right. Cheers

Homework Statement I'm asked to find the magnitude of the following complex function: R(j \omega) = 1 + \exp{(-j \omega)} + \exp{(-j2 \omega)} + \exp{(-j3 \omega)} + \exp{(-j4 \omega)}Homework Equations NoneThe Attempt at a Solution I did the following but got stuck immediately as I'm not...

Homework Statement Problem one on this pdf file. http://www.dtfizzix.com/APEXAMS/Phackets/B-1987-Exam.pdf Homework Equations F=ma ΣFx= ma The Attempt at a Solution ΣFx= (m1+m2)a What are the total forces on of the block labeled M1?

Homework Statement A ferris wheel at a carnival has a radius of 12 m and turns so that the speed of the riders is 8m/s a) what is the magnitude of the centripetal acceleration of the riders? b) what is the magnitude of the net force required to produce this centripetal acceleration for a...

Homework Statement A lost dog travels 30 degrees south of west for 450m. He then smells some food and sprints at 20 degrees east of north for 600m. Homework Equations a) Draw each vector. Label the magnitude and thetas. b)Calculate the vector components c) calculate the magnitude of...

Homework Statement I'm asked to find the magnitude of a complex function R(jw) = 1 + exp(-jw) + exp(-j2w) + exp(-j3w) + exp(-j4w) R(jω) = 1 + \exp{(-jω)} + \exp{(-j2ω)} + \exp{(-j3ω)} + \exp{(-j4ω)} where ω is the angular frequency j is the imaginary number j = \sqrt{-1} and \exp(-jnw)...

Homework Statement A 12g coin slides upward on a surface that is inclined at an angle of 14degrees above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.25; the coefficient of static friction is 0.40. Find the magnitude of the force of friction when...

Homework Statement I'm given a table of vectors A, B, and C of mass, magnitude, direction, x component, and the y component. The weights of 3 masses will apply tensions to 3 cables on a force table, the object is in translational equilibrium. Given: Vector A: m=0.2, magnitude=?, direction 30...

Mischievous Joey likes to play with his family's lazy susan (this drives Mom crazy because it is an antique). He puts the salt shaker near the edge and tries to spin the tray at a speed so that the shaker just barely goes around without slipping off. Joey finds that the shaker just barely stays...

A chain consisting of five links, each of mass 0.1 kg, is lifted vertically with a constant acceleration of a = 2.5 m/s2. Find the magnitude of (a)the force on link 1 from link 2 (b)the force on link 2 from link 3 (c)the force on link 3 from link 4 (d)the force on link 4 from link 5...