Confusing Definition and 396 Threads

A boy whirls a stone in a horizontal circle of radius 1.2 m and at height 1.7 m above ground level. The string breaks, and the stone flies horizontally and strikes the ground after traveling a horizontal distance of 10 m. What is the magnitude of the centripetal acceleration of the stone while...

I want to know the motion pattern of two objects that spin around each other,for example, me and my friend spin around each other,I look at her and see she is spining around me and she look at me and see that I spining around her.

I believe at this point I am just confusing myself. A car is approaching an intersection at a velocity of 20 m/s. When the car is 50 meters from the intersection the light turns yellow. The light will remain yellow for 3 seconds. The intersection is 20 meters in width. The driver can either...

a block of iron defined by parameters mass,volume and density.when volume is doubled,the mass is also doubled;but the density of doubled volume of iron block remains the same.how do you distinguish the parameters mass and density.give any example (may be 2 or 3),so that i can understand well...

Max spped for a car to go around a curve track without skidding...confusing! here's my question, a car of mass 1000kg moves along the corner of a level road having a radius of curvature 35.0m. If the frictional force between the tyres and the road is 4kN, the maximum speed of the car without...

Can someone explain why 1. Vb/Va=Vc/Vd in a Carnot cycle? 2. Why can any cyclic process be broken down into a number of Carnot cycles? 3. Why does free expansion represent the limit of irreversibility at which all of the "potential" work is degraded to heat.

[FONT=Times New Roman]I'm trying to find out if there is a way to figure out speed and frequency with only a wavelength component, but having no such luck...I'm currently working on a project involving making a homemade musical instrument (I've made a kind of recorder with a closed air tunnel...

Well, you might consider my remark to be really silly :smile:. I was thinking about subtraction of reals and the following ideas came to my mind: From one side, we may consider subtraction to be addition of the inverse of an element, for example: (5 - 3) - 2 = (5 + (-3)) + (-2). This...

Differntiation! Bloody Confusing! HI guys help me out here with some differentitaion problems i'll post here what i have done and show me the way to go thanks 1. find dx/dt where x=(4-t)^5t i tried using the chain rule but it doesn't work though cos you got that t constant do i use the...

i heard some breaking news about a gamma ray emission which is confusing some scientists. did anyone heard about it?

\int (sin(t)-cos(t)) \sqrt{cos^2(t)-sin^2(t)} dt Is there a trig idendity I can use? I've distributed that root to both terms to get: \int sin(t) \sqrt{cos^2(t)-sin^2(t)} dt - \int cos(t) \sqrt{cos^2(t)-sin^2(t)} If I take one of the terms and integrate by parts, I'm trying to put...

Hi there, I am very confused now, please help me with this circuit problems: For the circuit shown in the diagram, a. Find the readings on teh ammeters A, B and C( assumed to have effectively 0 resistances) b. Find the p.d. between X and Y. c. Find the power dissipated as heat in the...

Ok, I have this word problem dealing with exponential growth and decay. I need serious help. There are three parts to this problem...I really need help with this. Here's the problem: A dilution is commonly used to obtain the desired concentration of a sample. For example, suppose that a 1...

Does anyone else have trouble with confusing and inconsistent standards of notation in mathematics? I am an economics undergrad, and I can't help but think that math would be 1000 times easier if there was just better notation for it. Does anyone know of any radical attempts to create new...

Just looking over some extra physics questions and I came upon this one, it seems quite easy, but difficult when i actually attempted it: Just as a traffic light turns green, a waiting car starts off with a constant acceleration of 6.00m/s^2. At the instant the car begins to accelerate, a truck...

Hi everybody, I'm not clear about whether we should consume large quantities of vitamin C. This is confusing to me, because in different sources I read different things. Some say that this vitamin is stored and contributes to better health (immunity, stronger connective tissue, etc), so the...

"Equal volumes of different ideal gases at the same temperature and pressure must contain:" A. The same number of atoms B. one mole of each gas C. The same amount of gas D. 6.022 x 10^23 particles of each gas Since it is not 24dm^3 of each gas, I can rule out B and D. After...

In the asset market equilibrium and Arrow-Debreu equilibrium, for each every agent, the budge constraint has the form of inequality (not strictly), however, Asset market clear is the aggregate asset is zero and market clear is aggregate endowment euqals the aggregate consumption. I wonder if we...

static equilibrium problem A 900-N boy sits on top of a ladder of negligible weight that rests on a frictionless floor as in http://m.domaindlx.com/barnsworth/physics.JPG. There is a cross brace halfway up the ladder, and the angle at the apex is 30 degrees. a) What is the force exerted by...

Here is the question 3x^2-24x+48=0, determine the value of the discriminant. What does this value tell you about the equation? How many times does the corresponding function cross the x-axis? Ok first part a=3 b=-24 c=48 discriminant b^2-4ac so (-24)^2-4(3)(48) 576-576=0 So first...

What equation in the form y=sin(theta)+c best models the dtat in the chart below... ____________________________________ (theta)radians : 1 : pi/2 : pi : 3pi/2 : 2pi ______________________________________ y-------------: 2 :--3--:-2-:-1----:--2 __________________________________ I am...

Im a bit confused about a question on circular motion that I'm answering. Ill state the entire question and then say what I am confused about. In class we discussed circular motion for the case \displaystyle{\frac{d\theta}{dt} = \omega} Now assume that the circle has radius r and that...

I have u(x,t)=-2xt-x^2 find maximum in region {-2 ≤ x ≤ 2 , 0 ≤ t ≤ 1} I believe to find the critical point first I have to take the partial derivative with respect to x and t and equate to zero. Thus Ux=-2t-2x = 0 Ut=-2x = 0 Thus the only critcal point I find is x=0, t=0. But the...

Optimization Problems (So confusing) Please me on this once. Thanks in a million ! The Dome Tent 1 .Imagine making a tent in the shape of a spherical cap (a sphere with lower portion sliced away by a plane). Assume we want the volume to be 2.2 m^3, to sleep two or three people. a. make a...

Why is physics so confusing? Hey, it's my first time here...cz i need serious help. My teacher gave us a review sheet for a big test, and he expects me to do it, even knowing that i jus moved into this class... I've got most of the notes...but i still find things confusing... For...

Hey guys, Having trouble gettign my head around these indentities! So confusing so does anyone have a website which goes through the explanations systematically. My textbooks touches on it but the explanation doesn't cover all the variations. and the "letts AS Revisions guide"...

Positive charge is uniformly distributed throughout a non conducting cylindrical shell of inner radius R and outer radius 2R. What radial depth beneath outer surface of the charge distribution is the elctric field strength equal to one half the surface value? errr e0 = epsilon 0 the...

Two charges, one -q and one +q are located at x=-a and x=+a, respectively. Use a spreadsheet to plot the electric field along the x asix. Part of this problem is choosing a reasonable range for the plot. How do I go about doing this?

I know this is simple, but I am a bit confused 1) find the pH of 12.1 M HCl - the negative log gives me -1.8. What am I doing wrong 2) 50% NaOH (roughly 15 M) - I am not sure how to do this one either thanks nautica

A lump of wet putty moves in uniform circular motion of radius 20cm on the rim of a wheel rotating counter clockwise with a period of 5.00 seconds. The lump fly's off the rim at the 5 o'clock position and from a height of 1.20m above the ground and a distance of 2.50m from a wall. At what...

Physics 11 is so confusing ... A Person,resting in a boat, notices that 16 waves pass the boat every 38 seconds ... HOw many waves would pass the boat in 55 seconds?

Two confusing questions :( Hello, I have two questions but I'm getting confused with them. Can someone help me please ? ____ 1) A structural I beam is made of steel. A view its cross-section and its dimensions are shown in: http://web.csuchico.edu/~ma260/physics/phys.jpg The density of...

While driving down the road one day, a motorist sees a truck (closed van) coming up behind him rapidly. The van passes him, but a short time later he sees it parked along the road, and the driver is out beating the side of the truck with a tire iron. He goes on, and soon he sees the truck...

On the final exam that I just took, the last problem went like this: A spotlight is shining on a building. It is 36 feet away from the building. A man that is 6 feet tall is walking toward the building. Calculate the rate of change in the length of his shadow if he is walking toward the...

Which of the following statements are true? (Give the letters, i.e. ACD) A) One can calculate nonrelativistically when the kinetic energy of an object is large compared with the rest energy of the object. B) The proper time interval is the shortest time interval measured in an inertial...

Hi all! This what I've done: First I pumped underpressure into a glass container, checked the manometer's reading and then weighed the container on two different scales. Then I opened the valve a bit, checked pressure and weighed the bottle etc. I did this 10 times. So what I've got is 10...

There is a couple of questions that have arisen after i read about the general theory of relativity. 1. Should it be possible in principle for a photon to circle a star? 2. Do binary stars rotating around a center of mass radiate gravitation waves? 3. How are gravitational waves...

hi i have a problem that i am confused with and i need some help or at least a place to start The problem states: A 5/8 inch diameter hose is used to fill a round swimming pool 7.2 m in diameter. How long will it take to fill the pool to a depth of 44 inches if the water issues from the...

Hi, I've spent a long time and wasted lots of paper on this question. It might be very easy to do but I have tried/used every one of the motion formulas and don't seem to get a right answer. This is one of those challenge question that our teacher has given us. He hasn't worked out the answer...

I drew out a diagram for this question and wrote out all my givens. I looked through all the formula's I have and I just can't put the pieces of the puzzle together. If anyone can help that would be greatly appreciated. Question: A 1.5kg steel mass is dropped onto a vertical compression...

Any help is appreciated! 1)A man standing on a railroad flatcar moving at 1000ft/s to the left fires a bullet, whose muzzle velocity is 1000 ft/s in the opposite direction. What does an observer on the ground see teh bullet do? *I think he sees the bullet fire away at 2000 ft/s in the...

resolving vectors problems hello, i have some questions to do but am unsure where to start on some of them, the first one is [assume the Earth's gravitational pull is 10n] 1)"A motor vessel tows a small dinghy by a rope which makes an angle of 20 degrees to the horizontal. The Tension in...

Hello everyone. I've been at this for an hour now, so I think it's about time I asked for help. We have a person on the surface of a planet with an unknown gravitational acceleration. The only measuring instrument available is a very accurate watch. The person is on top of a cliff, and...

Say there's a ball being thrown upwards (from the bottom to the top of a building) with an initial speed of 29.4 m/s for 4 seconds at an acceleration of -9.8 m/s². Now here's a few of my problems: 1.) My book says the ball would stop after 3 seconds. Wouldn't it therefore be pointless to...

As a train APPROACHES a ringing crossing gate, Stacy, a passenger on the train, hears a frequency of 440 Hz from the bell. As the train RECEDES , she hears a frequency of 410 Hz. How fast is the train traveling? (formula: f = fo (v+ vo)/(v-vs)) f= frequency that she hears fo= actual...

A train starts from rest and accelerates uniformly in a straight line until, after 10s, it attains a speed of 40m/s. It then continues to accelerate at the same rate until it has traveled a total distance of 500m. What is the distance travled by the train during the first 10s? What...