hand Definition and 466 Threads

Compute the force exerted on the palm of you hand by the beam from a 1.0W flashlight. (a) if your hand absorbs the light, and (b) if the light reflects from your hand. What would the mass of the particle that exerts that same force in each case would be if you hold it at Earth's surface? On...

Hey, I have a project where my group needs to design a drill. I am wondering if anyone here knows how to calculate the torque we get from 3 AA-batteries on 3.6 V (10.6 V together). How does it work? It just needs to assemble furniture, so we don't need very much force on it. Do you know what...

Homework Statement Homework EquationsThe Attempt at a Solution Answer is C? But why?

Hey everyone, I was hoping you could help me solve a little problem. I'm having a little difficulty understanding why the right hand rule works for determining the direction of the magnetic field. I've found a similar question posted here...

Homework Statement Refer to solution II , the author used the scalar analysis( dot product) to get the direction of moment ...IMO , this is incorrect ... Only cross product can be determined this way . correct me if I'm wrong . Homework EquationsThe Attempt at a Solution

the moment is r X F = rFsin tetha which means r is projected to F , am i right . If so , then the resultant force should point downwards( by using right hand thumb rule) , am i right?

Lets say I apply a force of 20N to a 10kg block on a frictionless table. Then the acceleration of the block is F= ma = F/m = 2m/s^2 = a. Then, supposing I am standing on the ground with real world friction such that I am not accelerated in the opposite direction when I push the block that is...

When I lower on object towards my palm (e.g. a pendulum on a long string, or a small metal object, etc) I feel a very subtle, but distinct sensation on the palm of my hand. What could be causing this? I don't think it is heat from the other hand. Can an stationary object produce a subtle...

Homework Statement A magnetic field of 0.0200 T (up) is created in a region. a) Find the initial magnetic force on an electron initially moving at 5.00 x 10^6 m/s (N) in the field. b) What is the radius of the circular path? Make a sketch showing the path of the electron. Homework...

Please forgive me as I am inquisitive enough to be dangerous. Question First, Thoughts Behind It: * How much validity is there in the application of Fleming's Left [edit: RIGHT!] Hand Rule towards the orbit of the Earth around the Sun? * I saw that NASA recognizes this but they seem to sort...

I'm taking the PGRE in about 3 months and haven't really began studying. There's loads of study tips out there already, but I'm looking for any first hand experience anyone has had with taking/studying for the PGRE. I've found that no matter what tips you can find, first hand experience is...

Hi, I was wondering if anyone has any advice on when to use FLHR and FRHR in the Edexcel A - Level Physics, as I'm mixing them up in questions. Thanks, Abby

Hi, I have been working on this problem for a while: You place a book flat on a table and press down on it with your right hand. The hand-to-book and table-to-book coefficients of kinetic friction are 0.48 and 0.43 respectively. The book's mass is 1.14 kg and your downward push on it is 9.70 N...

Homework Statement I'm going to cut from the initial part of the problem, which I am confident is good to go, and cut straight to the antiderivatives. Homework Equations All antiderivatives are to be integrated on the interval from 0 to π/18 (I1) = -1/9 cos 9x - (I2) (-2/27 * cos3(9x)) + (I3)...

Homework Statement What is the probability of getting a 5 card hand where the 5 cards are from exactly 2 suits Homework Equations nCr = n!/(r!(n-r)!) The Attempt at a Solution There are two possible cases where the 5 cards are from 2 suits, case one is 4 are from one suite and 1 is from...

I am trying to understand how to draw nyquist plot. Lets say the transfer function is Subbing in jω for s, ***Note: should be (jw)^4 , (jw)^3, (jw)^2 Then separating the Real and Imaginary part, So when w = 0, in the nyquist plot it is infinity w = infinity, it is 0 Imaginary intercept is...

Homework Statement For \mathbf{F} = y \mathbf{i} - x \mathbf{j} + 4z \mathbf{k} evaluate the surface integral of (\nabla \times \mathbf{F}) · k over the 2D surface of the disc x^{2} + y^{2} \leq 4, z = \frac{H}{2} Homework EquationsThe Attempt at a Solution I am unsure of my answer to this...

Homework Statement Homework Equations Right Hand Rule The Attempt at a Solution I can get the magnitude, but cannot get the directions from the RHR. Can somebody make video/explain? Thanks!

I am designing a flat plate heat exchanger for a project and I am not sure where to start with the hand calculations, specifically the LMTD and E-NTU methods, also how to work out the parameters which i will need to complete these methods such as area and number of plates. My deadline is soon...

I'm just really confused with this right hand rule even though it seems like it's supposed to be pretty simple and obvious. I know the rules, however it doesn't really work for me. Maybe I'm doing something wrong. I have three examples I'd like to cover which are related to each other, I hope...

Homework Statement I understand that the right hand rule is a convention to give the movement of charged particles around a current carrying wire, but why is it possible to have a standard convention? Why can't the charge particles move either way? Why does the movement of particles in that...

Hello there, people! I am quite new here; in fact, this is my first post. I am quite strange to this place. Feeling kinda welcome, though. Okay, so short to the point. I am an 8th grader, and my school just started teaching us about electricity. Well, the basics. I knew much about it, much...

Hi, I am familiar with drawing rays through a lens. But when a few lenses are put together, things become confusing to me. For example, if a first positive thin lens at 0 forms a real image 10cm away, what would happen when we put a second positive thin lens, say at 5cm along the optical...

Show that $\lim_{{x}\to{0}}$ $\frac{1}{x}$ does not exist? Please tell me how to make LHL and RHL for this? Explain me all steps used?

More acidity means more electronegativity, and more electronegativity means more dipole moments. I observed that liquids with low dipole moments (bases) often have lower density and surface tension, but not necessarily hydrogen bonds. To contradict it, acetic acid have a low surface tension but...

Hey all, I'm currently working a Calculus problem that requires me to sketch f(x)=(3x-1)/(x-1)^2 without using a calculator. Part A: Requires that we find; i. x-intercept: f(0)=(3*0-1)/(0-1)^2=-1 So f(0)=-1 ii. y-intercept: f(x)=0 therefore; 3x-1=0 or x=1/3 So f(1/3)=0 iii. horizontal...

Homework Statement When an object is static (not moving), forces and moments must balance to zero. A moment here is defined as the force applied to an object multiplied by the distance from the point of rotation (torque). A simple way of thinking about moment balances is to consider a seesaw...

I was watching a program on the worlds largest cruise ship, the Oasis of the Seas. It displaces 243000 tons. They we're discussing the sophisticated maneuvering systems and I got to thinking. Let's say the ship is docked, within a foot of the dock and untethered. If I sat down with my legs...

I am giving the following input to Ti-89 Titanium: limit(S((2 x cos(100 x Pi x t)+2 x sin(10 x Pi x t))2 ,t,-t1,t1)/(2 x t1),t1,inf) where S is the integral symbol, Pi is π = 3.14, x is the multiplication symbol and inf is the infinity symbol The TI-89 answer is undef If I do it by hand it...

Working on a problem and unsure how to set it up. Feels similar to other I believe is solved correctly. Any help appreciated. Solved problem: 52-card deck, 13-card hand, odds of getting 4 of a kind. For this I used a Hypergeometric Distribution with the following parameters: 1) population size...

Homework Statement I have a question that involves a wire XY (X moving down the page to Y) moving to the right of the page at right angles to a magnetic field that acts out of the paper. The question then asks me which end of the wire will become positively charged. The textbook uses...

according to RHR , the curled fingers show the direction of magnetic field or flux & the thumb gives the direction of current.. but I am confused about the curling of fingers.. I want to make my doubt clear by the pictures I attached.. In bothe first & second picture , the magnetic field is in...

I'm looking to reduce the amount of books I have, but I'd like to get a few references references books to replace them. I'd like a set of books that encompasses everything from mechanics, nuclear, optics, and solid state, to ,basic lab electronics, astronomy, quantum, and their mathematical...

Homework Statement Show that the expected number of successes in n Bernoulli trials w probability p of success is <x> = np Homework Equations The Attempt at a Solution So I get the right answer which is this: E\left( x\right) =\sum _{x=0}^{n}x\left( \begin{matrix} n\\...

Hi, I am looking for a material that molds/gets shape with hand at room temperature and does not separate! Does such a material exist? (By the way I am do not have physics background!) Many thanks for you help :) Leila

I am adding 2 extra rear speakers in my jeep, I have some rca cables comming from the rear speaker pre-amp outputs from the back of my pioneer stereo. My plan which works beutifully is a dc-dc boost module bringing the cars 12v up to 20 for the main amplifier. The main amp is a 2x25...

Hello, Been a while since I posted on here, nice to be back :) . I just want some pointers as to the methodology for an impact load case that I'm looking at. I've attached a very basic sketch of a trolley which is traveling at a known velocity and impacts a rigid structure at it's base. What...

I know that you probably get tired of weird questions like this so I apologize in advance. I was thinking about length contraction in special relativity. I was thinking if superman was moving towards a basket ball at close to the speed of light when he passed it from his frame of reference it...

Can I use Fleming's right hand rule to determine the direction of current when a magnet is moved into a coil(s) of wire? I am finding it difficult because the magnetic field and movement are parallel instead of at right angles. If not, does this mean I am only allowed to use it when a wire...

Homework Statement The question specifies the auxiliary equation given is (D^2 + D - 2) = (e^x)/(x) the method of variation of parameter must be used to find the particular solution to the right hand function. then finally the general soultion should be stated.Homework Equations variation of...

Define: \[ f(t) := \frac{7^t}{7^t + \sqrt{7}}. \] Without the aid of a computer or calculator, evaluate: \[ \sum_{k=1}^{2013} f \left( \frac{k}{2014} \right). \] (Please show the work.)

The time dependent Schrödinger equation is: i\hbar\partial_{t}\Psi=\hat{H}\Psi Does it mean that the operator i\hbar\partial_{t} has the same eigenstates and eigenvalues as any Hamiltonian?

Homework Statement If C = A × B, A points up, and B points south, which direction is C? Select one: a. west b. up c. north d. down e. east Homework Equations The Attempt at a Solution i used the right hand rule and got east as the solution could i have a little verification...

Shooting a .45 caliber hand gun on the moon "launches" you a mile? My co-worker and I were having a discussion about an activity that he did while at a teachers math conference. The activities was to rate the importance of objects. There were 15 objects and you are stranded on the moon 200...

Homework Statement Not a Home-work problem,just a doubt.Since this is a school doubt,I will post here. Fleming's left and right hand rule Why do we use two hands for the same thing?Can't we just use one hand? Why is it different? I have tried searching Google but could not get an answer...

Hi, So I'm studying Chemistry and biology and I'd like to hear your advice on notetaking. Perhaps some of you can help me find some good software for taking notes faster? First let me paint the picture for you: Whenever I learn a new subject such as electrochemistry or Entropy etc., I like...

Homework Statement Conventional current flows in a ring in the direction indicated in the diagram (if you stand at location A, on the +x axis, and look toward the ring, current flows clockwise). At each of the locations labeled by a letter, use the right hand rule to find the direction of...

Homework Statement Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 10 rubs a distance of 7.50 cm each and with a frictional force averaging 45.0 N, what is the temperature increase? The mass of tissue...

Hello everyone, I take notes strictly with Latex, as I am able to get more done in a day by not taking hand written notes; and lately I have been contemplating using latex to write up solutions to problems for the same reason, that I might get more done in a day. My concern is, however, that...

Problem statement What is the left hand and right hand limit of 1/x^2 -4 at its vertical asymptote? Revelant equations None Attempt at a solution It's vertical asymptote are 2 and -2. I have attached my work . I understand it however at the back of the book it says the left hand limit at...