Direction Definition and 999 Threads

Homework Statement Homework EquationsThe Attempt at a Solution Hi! I got the magnitude using F=qvB using information from the top of the qs. But the direction is confusing me. I used the Fleming's left hand rule but it sort of isn't giving me the right answer

Homework Statement Homework Equations The right hand curl rule gave me the counterclockwise direction for the magnetic field but I am confused about how is it going to work for the particle. Thanks The Attempt at a Solution

Homework Statement Hi! A long, straight, current-carrying wire is placed between a pair of magnets as shown. What is the direction of the force on the wire? Homework Equations Fleming's hand rules The Attempt at a Solution I used the Flemings right hand rule but that gives me that the force...

Homework Statement I'm having trouble understanding how to find the angle of a vector. Here we are given the x and y component to help us find the direction of vector C. In this case, both x and y component is negative, so it should be in the third quadrant. I know that since we have both the x...

Homework Statement Solve the free diagram of two stacked boxes on a frictionless table accelerated by a force. Homework Equations [/B] None The Attempt at a Solution I have box 2 stacked on box 1. Box 1 is on a frictionless table and accelerated by a force. However, there is friction...

I am trying to learn all about Quantum Physics on my own but I am struggling to find credible sources of information. As you are probably aware the internet is filled with misconceptions, crackpot science and weird stuff about spirituality (at least that's what I find when I try and research...

1. Homework Statement It is a part of the question in my homework and I extract this out just for the part i m confused(in the picture above) Homework Equations Moment couple=d*F [d is the difference in point of application (=sqrt41) or the perpendicular distance of the forces(=0) ?] The...

Homework Statement suppose we have a charging capacitor orientated along the z-axis, such that we have a changing electric field. How do I determine the direction of the associated magnetic field. Homework EquationsThe Attempt at a Solution I calculated the magnitude of the B field, and my...

Hi, I would like express that I really tried to dig something about the formula related to electron direction in photoelectric effect, but I could not find. Also I have seen that electron direction in photoelectric effect is not known according to some sites in internet. So, ıs it real that in...

Homework Statement A car is moving with a constant velocity of 18 m/s for 5 seconds, if in the next 5 seconds it travels a distance of 40 m, what is its final velocity? Homework Equations Δx= vit+ 1/2 at^2 vf= vi+at vf^2 = vi^2 + 2a (Δx) The Attempt at a Solution So I tried doing it different...

Homework Statement If my car was moving to the right then I changed direction of motion to down, and the speed is constant and =5m\s, how to calculate acceleration Homework Equations Δv=vf-vi The Attempt at a Solution Make vectors addtion and use pythagorean theorem formula, so change in v...

Homework Statement I didn't get it. Consider velocity space. The no. of velocity vectors for a given speed is proportional to the surface area of a sphere of radius v in the velocity space. So, a fraction of velocity vectors with speed v in an elemental area dA is##\frac{ dA}A##. A = ##\Omega...

If I'm driving a car and I have changed my dierction of motion without changing the speed, in this case how to calculate the acceleration of the car in a particular time? I'm not talking about circular motion.

Homework Statement Homework EquationsThe Attempt at a Solution the point is going down the wave, so shouldn't the answer be D? Why is it B? Thank you! [/B]

Hello, I just did a practice physics problem that asked if an object with constant acceleration can change direction twice. The answer was no. What if you had an object attached to a string spinning at constant velocity. Is the tangential acceleration constant?

All sites and books give different answers for this question:( Homework Statement predict the polarity of the capacitor in the diagram below Homework Equations right hand thumb rule AB is capacitor The Attempt at a Solution The side facing south pole becomes south and north facing side...

Homework Statement In Fig. 32-4( a) there is a uniform magnetic field in the + x-direction, with a value of B = 0.20 T. The circular loop of wire is in the yz-plane. The loop has an area of 5.0 cm2 and rotates about line CD as axis. Point-A rotates toward positive x-values from the position...

Homework Statement Consider a wave vector which hits a plain boundary between water and air. The wave vector hits the boundary with an angle α1 measured from the vertical axis. The magnetic field amplitude has a y-component only. Also, notice: The z-axis is the horizontal axis, the x-axis is...

I just saw a double rainbow. On the brighter bow the color arcs were red on the left edge of the bow and shifted to blue on the right edge. On the dimmer bow the colors shifted from blue on the left edge to red on the right. Why were they separated oppositely like this?

My question is simple, in the problem on the picture that i uploaded, why is -fk =ma I understand the friction is in the negative direction, só it is negative, but the netforce, and the aceleration, are also in the negative direction ,só why are they positive? Shouldt it be -fk=-ma ?

If there is a rotating wire in a constant magnetic field what is the direction of the induced current ? The problem is the direction of the area vector which is arbitrary, if it is parallel to the magnetic field the current will flow in a direction, if it is anti-parallel it will flow in the...

Homework Statement To find the direction of magnetic field due to a toroid. Homework EquationsThe Attempt at a Solution Taking the cross - sectional shape of toroid circular, the toroid could be turned into a solenoid. A solenoid's magnetic field is along its axis. When the solenoid gets...

Homework Statement Decide the direction of Magnetic field of a very long solenoid consisting of n turns per unit length on a cylinder with current I flowing through. Homework EquationsThe Attempt at a Solution Deciding direction of the magnetic field: Considering cylindrical coordinates with...

Let say a car move with constant speed to the right. Can I say the acceleration is zero and is directed to the right? Or we can not assign certain direction to a zero-magnitude vector because I can also say that the car has zero backward acceleration (directed to left)? Thanks

Homework Statement Three lead spheres, of mass 10.0 kg each, are located at three corners of a square of ice length 45.0 cm, as shown. A bead is released at the forth corner. By considering the gravitational forces among the four objects only, determine the magnitude and direction of the...

Homework Statement A billiard ball moves at a speed of 4.00 m/s and collides ELASTICALLY with an identical stationary ball. As a result, the stationary ball flies away at a speed of 1.69 m/s. Determine a. the final speed and direction of the incoming ball after the collision b. the direction...

SOLVED THANK YOU

Homework Statement An object starts from rest and uniformly acquires a velocity of 20.0 m/s in 5.0 minutes. For the next 10. minutes the object moves with a constant speed. After 10. minutes moving at 20. m/s the object then again accelerates and reaches a speed of 15 m/s in the opposite...

Homework Statement Homework EquationsThe Attempt at a Solution using the left hand rule, second finger points the direction of current, thumb points direction of motion and first finger the direction of magnetic field. But If direction of current and motion is the same, what do I do? Thanks~

I recently read an interesting article published in Physical Review Letters in October 2014 - "Identification of a Gravitational Arrow of Time." There were also other articles in several general interest science magazines...

while i understand what plank length is... Has it ever been measured on multiple axis? As an indicator of the granularity has the plank length (or second) been thus measured?

Homework Statement Homework EquationsThe Attempt at a Solution I know if the currents are going the same direction they attract. So the top 2 attract each other and the bottom two attraction each other? And then the top repel the bottom... I'm stuck, please help~

Homework Statement A current carrying rod is held horizontally between the poles of a magnet by a magnetic force. magnet-current (into the page) -magnet determine which side is the north pole of the magnet? Homework EquationsThe Attempt at a Solution If I use the right hand rule, then the...

Homework Statement A cylinder of mass M and radius R rolls without slipping on a plank that is accelerated at rate A. Find the acceleration of the cylinder. Homework EquationsThe Attempt at a Solution Physical force acting on the system : Fphy = N + mg + fr w.r.t. plank frame i.e non -...

1. Homework Statement 1) I need to write the equation for torque on a current carrying loop in a magnetic field, which I believe i did correctly under the relevant euations section, does this formula look correct? 2) Use the right hand rule to determine the direction of the torque on the...

Homework Statement What is the force F (a vector) on the -10 nC charge in the figure? Give your answer as a magnitude and an angle measured cw or ccw (specify which) from the +x-axis. The figure shown is in the shape of a rectangle. On the top left is a +15 nC charge; on the top right is a...

I saw this thread "https://www.physicsforums.com/threads/electric-fields-magnitude-and-direction.765309/" If i understand this concept better now: E1 is facing opposite its source at +3 nC because it is a positive charge and the field flows out from the charge whereas -5 nC's vector points...

Hi, While solving homework problems, I start by defining a positive-y direction and a positive-x direction. Let's say up and to the right. Until now, I've applied this same rule to all objects in each problem, no matter the direction the object moves. But it seems I have not understood this...

HI, Can the normal force be in vertical direction ?

Homework Statement A particle of mass 0.195 g carries a charge of -2.50 x 10-8C. The particle is given an initial horizontal velocity that is due north and has magnitude 4.00 x 104 m/s. What are the magnitude and direction of the minimum magnetic field that will keep the particle moving in the...

Homework Statement Hi Guys, I am a bit unclear regarding adding vectors and hoping someone can clear up the confusion for me. In the image below, we are adding two vectors and we used the vector components to find find x and y. Finally we then used x and y to get the resultant and the angle...

Homework Statement The plotting compass, initially on the left and pointing to the geographical north, is now placed at point X. Which direction it will show? Homework EquationsThe Attempt at a Solution I think the arrow will point towards the south pole of the bar magnet (to the left). Is...

In the Great Courses lecture series "Oceanography", Prof. Tobin says that the general direction of beach sand movement ("sediment transport") along both the east and west coasts of the USA is from north to south. On the east coast, this is because the prevailing direction of waves is from the...

Homework Statement It's Problem 3 of this page: http://www.problemsphysics.com/forces/inclined_planes_problems.html "A box of mass M = 10 Kg rests on a 35° inclined plane with the horizontal. A string is used to keep the box in equilibrium. The string makes an angle of 25 ° with the inclined...

Hello! I am a medical student with an upcoming biochemistry exam, and I'm struggling with the concept of leading and lagging strands. My question is: Can the leading and lagging strand role be switched depending on the direction we look at the dsDNA? Or is the leading and lagging strand...

Hello Today we did a lab and one of the activities was having a compass underneath a wire while the current was off. The wire was straight so that it was directly aligned to be with the needle of the compass. One the current was flowing, the compass arranged itself in that it was not exactly 90...

Homework Statement The Attempt at a Solution Can somebody please assist me in finding the direction of the normal force exerted on B? (How is normal force at B also normal to the rod? ) There is no hint provided from which I can conclude the direction of normal force. Can somebody please...

I think it is about 90 degrees off but I never thought about wind direction too much. I guess let's say the wind is coming from the NE and there is nothing behind the flag so it's on a field. I know a windcone is 180 degrees so opposite wind direction.

Hi everyone, I am new to this forum. I hope someone could help me. I am a Psychology student and currently working as a student assistant in a research project. We are testing a mediated model, i.e. we want to see whether A's relationship to B is explainable by the indirect relationship through...

Homework Statement Homework Equations μ0 In,e = ∫B⋅ds The Attempt at a Solution I really don't how to approach this question at all. Do you have to integrate counterclockwise around the loop every time? If the field was decreasing as y decreased, would you integrate CW or is it still CCW...