Vertical Definition and 997 Threads

Homework Statement Albert is pushing a 1.8 kg book against a vertical wall at an angle of 30.0 degrees. If the coefficient of static friction is 0.47 and kinetic friction is 0.35, how hard does Albert need to push the book to allow it to slide down the wall at a constant speed? Homework...

Homework Statement The problem states that a pendulum is attached to a spring that can only oscillate in the vertical direction. I am supposed to derive equations of motion for the spring/pendulum system under my chosen generalized coordinates.Homework Equations Lagrange equations of motionThe...

Hello I have designed a vertical axis wind turbine (Savonius) with a 180deg helical twist. It catches the wind really well but the wind power to electrical power conversion is really poor, it is currently only at 4% efficiency. I think the problem is the dc motor that I am using as a...

I was wondering, if a Mass Driver launching only vertically would be best used to attain escape velocity, or if it could be coupled with horizontal propulsion to reach an orbit around the earth. (P.S. I apologize if this sounds a tad unclear and hastily written, I lost my original post)

Hi i am currently doing my dissertation in which i am designing a vertical axis wind turbine design that is a modification of that of a savonius design. A major problem that i am having is being able to predict the torque value of torque for my design in order for me to then predict the...

Homework Statement Uniform sphere of mass ##m## and radius ##r##, rolling without slipping on a horizontal surface at a velocity ##v_0##, hits the end of a rod of length ##l## and mass ##10m##, hanging on a hinge (Figure). Determine how the ball will move and the rod after the impact. What time...

I don't understand the ideas behind the continuity equation when applied to a vertical pipe. In all the questions I see regarding a vertical pipe of constant diameter, I see that the fluid's velocity will remain constant while traveling through the pipe. Common sense will tell you this isn't...

If the sun is close to the horizon, calculate the horizontal gravitational acceleration of a rock dropped near the surface of the earth. Do the same substituting moon for sun. Calculating (vertical) g is easy and one could apply the same method to get the horizontal g if you knew the masses...

Hello, I'm working with a 2 x 3D arrays of fluid velocity values (east-west -> u and north-south -> v) and would like to properly calculate vertical velocities (w) from them (n.b. this is not homework). This ultimately needs to go into a processing algorithm, so while symbolic math is...

1. Water at T1=240 C and P1=16 MPa is at 2 km depth. A drilling hole with diameter 0.2 m has the water flowing up with mass flow rate at 2 kg/s. The hole is considered adiabatic(no heat transfer). I need to find the following values at the top of the hole: Enthalpy(h), temperature(T2)...

Homework Statement A mass m hangs in equilibrium at the lower end of a vertical spring of natural length a, extending the spring to be a length b. 1) Show that the frequency for small oscillations about the point of equilibrium is ##\omega = \sqrt{g/(b-a)}## 2) The top end of the...

Homework Statement A mass m = 0.5 kg is dropped from a height of 1.5m above the end of an uncompressed vertical spring with k = 500 N/m. What is the maximum compression of the spring? Homework Equations f_sp = -kx W_sp = 1/2 kx^2 W_nc = ΔK + ΔU K = 1/2 mv^2 U = mgh W = Fdcos∅ p =...

[b]1. A 5kg block is held at rest against a vertical wall by a horizontal force of 100 Newtons. 1-What is the frictional force exerted by the wall on the block 2-What is the minimum horizontal force needed to prevent the block from falling if the static coefficient of friction between the wall...

So what would happen if there was a spaceship moving at 99% the speed of light straight up. The spaceship has a light clock, so a photon of light moving bouncing between 2 mirrors in such a way that the light moves ALMOST in sync with the spaceship moving up. In theory wouldn't the light photon...

Homework Statement Problem in the attachment Homework Equations -r(dθ/dt)^2= Centripetal force F=ma The Attempt at a Solution The tension force will be cut into two parts. I split the distance between the two strings into two sections, so the distance "r" to the mass can be...

Homework Statement Calculate the vertical acceleration a (positive if up, negative if down) of the 70-lb cylinder for each of the two cases illustrated. Neglect friction and the mass of the pulleys. I have attached an image of the problem Homework Equations The Attempt at a...

Homework Statement Agent 001 is on another mission... to stop Mr. LateforClass's ploy to threaten mankind with a moon based "Space" Laser, which is powered by rezigrene batteries. 001 tracks LFC for several months and finally finds him on the 2nd floor of an old run down factory. LFC jumps out...

Need help with Vertical Velocity! I have an exam tomorrow >.< I went to a tutor yesterday to get it all worked out, but I forgot to write down D in my notes! How do I solve for D? I have the answer, but no equation to work it. You jump horizontally with a speed of 2.7 m/s off a diving board...

Homework Statement "A spring is hung from the ceiling. A pan of mass 100.0 g is attached to the end, which causes it to stretch 5.00 cm. Find the maximum distance the pan moves downward when a lump of clay of mass 120.0 g is dropped from a height of 40.0 cm onto the pan." The correct answer...

Homework Statement I am only confused about F_y. The Attempt at a Solution I don't understand why in the equation F_y = ρghcA, the hc is 5m. Why do they take the centroid distance to be the very bottom?

Homework Statement Suppose the amplitude and frequency of the transverse wave in the figure are, respectively, 5.89 cm and 5.00 Hz. Find the total vertical distance (in cm) through which the colored dot moves in 3.00 s. http://i45.tinypic.com/3007ihy.png Homework Equations y = A sin...

Homework Statement Please check my work. Two students are on a balcony 19.6m above the ground. One guy throws a ball vertically downwards at 14.7m/s; at the same time the other guy throws a second ball vertically upwards at the same speed. The second ball just misses the balcony on the way...

Let's say we have a vertical spring. As it oscillates, the energy bounces between gravitational potential energy, spring potential energy, and kinetic energy, right? Why does my lab say that spring potential energy = kinetic energy at any moment in time? Is that a mistake on their part?

Before I write anything, I want to apologize because I have no idea how to write equations on this website. This is my first post >.< Also, thank you for helping in advance! Homework Statement A baseball is thrown vertically up with speed vo and is subject to a quadratic drag with magnitude...

Homework Statement A bus with a vertical windshield moves along in rainstorm at speed V relative to the ground. The raindrops fall vertically with a terminal speed of V' relative to the ground. At what angle do the raindrops strike the windshield? Homework Equations Kinematics...

Homework Statement A bullet is shot vertically into the air at a speed of 512 m/s. a) to what maximum height does the bullet go? b) how much time passes before the bullet stops rising? c) what is the velocity of the bullet after 60s? Homework Equations a) V2²=V1²+2ad b) a=...

Hello, this is not really a homework question, but a question on a specific problem so I thought it belonged here rather than the General Physics subforum. This is a problem that was asked in our final exam, and I have doubts about it's "correct" solution. Here's a paint art to explain the...

A= i +j+k A=(1,1,1) can I write in vertical as shown? is there any difference between them? Thank you

So I was having a discussion with a buddy and we were trying to decide the proper equation to translate a horizontal force to a vertical force on a wedge. See my drawing below, if I apply a force at Fh, what is the equation for find out the force Fv? Thanks!

Homework Statement I am having trouble deriving the velocity equation for an objekt moving vertically upwards. the net force will be m*dv/dt=-mg-kv^2 where k is the drag. At the time t=0 the object's velocity wil be v(0)=v_0

Homework Statement A massless spring hangs from the ceiling with a small object attached to its lower end. The object is initially held at rest in a position yi such that the spring is at its rest length. The object is then released from yi and oscillates up and down, with its lowest position...

Apologies if this is too basic, but I've been studying for a while and I'm stuck. Homework Statement Spring paradox. What is wrong with the following argument? Consider a mass m held at rest at y = 0, the end of an unstretched spring hanging vertically. The mass is now attached to...

Homework Statement If you are spinning an object of mass 3.25 kg on a 0.8 m long chain at 20 rpm (vertical cirular motion), a) what is the tension at the top b) 43° from the top and c) at the bottom?Homework Equations String tension: T = Fc - mg cosθ Tension at top: T = (mv^2/r) - mg Tension at...

Homework Statement A small car with mass .800 kg travels at a constant speed of 12m/s on the inside of a track that is a vertical circle with radius 5.0m. If the normal force exerted by the track on the car when it is at the top of the track is 6.00N, what is the normal force at the bottom of...

Homework Statement a)x=cos2ωt, y=sin2ωt b)x=cos2ωt, y=cos(2ωt-∏/4) c)x=cos2ωt, y=cosωt draw the graphs of Simple Harmonic Motions.Homework Equations parametric and complex harmonic motion equation is needed.The Attempt at a Solution No attempt to solution.I can't do anything,because I can't...

Can anyone briefly explain to me when using conservation of energy to calculate for vertically mounted spring questions, why gravitational potential energy is neglected?

There's no real question per say. I've been looking in books and on the internet i can't find anything. I don't know when to use the vertical and horizontal line test to test for injective functions and surjective. Let's say if I was to sketch the graph of x2+4x - 5 I would get a...

A 0.8 kg ball is whirled on a string r = 0.4 meters long in a vertical circular path. At the bottom of the circle, the ball is h = 0.45 meters from the ground. At the top of the circle, the ball has a speed of 3 m/s. Assume that the total energy of the ball is kept constant. a. Calculate...

Ok, so I'm using an arduino with an led matrix and a homemade pressure sensor to figure out the height of a vertical jump and then display the info back. First I get the amount of time between when the person left the board and when they land back on it. I then divide the time in half and use...

A mass of 0.5 kg hangs motionless from a vertical spring whose length is 0.80 m and whose unstretched length is 0.40 m. Next the mass is pulled down to where the spring has a length of 1.00 m and given an initial speed upwards of 1.5 m/s. What is the maximum length of the spring during the...

Homework Statement The drawing shows a 152-kg crate hanging from the end of a steel bar. The length of the bar is 0.09 m, and its cross-sectional area is 3.80x10^-4 m^2. Neglect the weight of the bar itself. (a) Determine the shear stress on the bar. (b) Determine the vertical deflection...

Homework Statement I found that the domain of f was defined for all reals x<-1/3 and x>1/3. Now, I need to find the limits and vertical asymptotes of ##\lim _{\chi \rightarrow \dfrac {1} {3}}\dfrac {x+2} {\sqrt {9x^{2}-1}}## According to Wolfram Alpha, there is no limit. But, I found that the...

Coordinate System--Spring Vertical Hi! This is a question on the use of a coordinate system. In the princeton review, I don't understand the coordinate system they are using it; it doesn't make sense. That is, for a vertical spring, the net force on the mass is kx-mg. But, shouldn't it be...

Homework Statement A mass of 0.5 kg hangs motionless from a vertical spring whose length is 0.90 m and whose unstretched length is 0.45 m. Next the mass is pulled down to where the spring has a length of 1.15 m and given an initial speed upwards of 1.4 m/s. What is the maximum length of the...

Homework Statement A pilot, whose mass is 96.0 kg, makes a loop-the-loop in a fast jet. Assume that the jet maintains a constant speed of 225 m/s and that the radius of the loop-the-loop is 2.064 km. What is the apparent weight that the pilot feels (i.e., the force with which the pilot...

Homework Statement A string pulls a 50kg block 10m up and the acceleration of the block is g/10. What is the kinetic energy of the block? Homework Equations W = Fd W = 1/2*mv^2 The Attempt at a Solution 1st attempt (each force work separately) The work done on the block from the...

Hello, I know the electromagnetic field propagates in a 3D space so if I am horizontally aligned with the field I will receive its variation but what if I'm vertically aligned ? thanks

Hey guys, For my degree project this year I am designing a Vertical heat pipe to be used in a geothermal heat/power production application. I was wondering if anyone knew of some good resources about this topic. Any advice would be appreciated!

Homework Statement A 115kg mail bag hangs by a vertical rope 3.3m long. A postal worker then displaces the bag to a position 2.2m sideways from its original position, always keeping the rope taut. As the bag is moved to this position, how much work is done by the rope? Homework Equations...

Is there any decent way to quickly spot if I should divide a 2d figure defined by functions into horizontal or vertical strips when solving centre of mass problems? Or does it come down to experience and/or math-talent? Problems like the1 in this video is what I'm on about...