Homework problem Definition and 405 Threads

Homework Statement What is the ratio of the volume of the bulb of a thermometer to the volume of the thin tube in a bulb thermometer. It's not really a problem, but its just something I need to know to for my course. I can't find it anywhere else, so I was wondering if anyone knew it here...

Consider two iron spheres, each of diameter 100mm, which are just touching. At what distance r from the center of the Earth will the force of mutual attraction between the contacting spheres be equal to the force exerted by the Earth on one of the spheres? Here's my work... d = distance...

Homework Statement Homework Equations I know that at low frequency the capacitor will act like an open circuit. However, i do not know what is meant by input impedance, does this just mean the combined impedance of the components in this circuit? The Attempt at a Solution Assuming it is...

Homework Statement Determine wheatehr the sequence diiverges or converges:Homework Equations a_{n}=\frac{(n+2)!}{n!} The Attempt at a Solution I was going to treat it using limits but the factorial is not defined for a function. How do I deal with this? Edit: sorry it is suppose to be...

There doesn't seem to be a homework problem section for linear algebra so either this is the place to post it or they'll move it. The question is to prove that r0 = 0. I can't even figure out the first step. Can someone tell me the first step in solving this problem? Thanks. Pete

1. If I measure the acceleration of an object every 1 second, I will have a g-force which I can use formula 1 to convert into meters per second per second. Therefore I know from the result of this formula how much the object has accelerated/de-accelerated in the last second. If however I wish...

I need help desperatley with this problem. Sam (65 kg) takes off (from rest) up a 50 m high, 10° frictionless slope on his jet-powered skis. The skis have a thrust of 160 N. He keeps his skis tilted at 10° after becoming airborne. How far does Sam land from the base of the cliff? I believe...

Homework Statement A 68 kg in-line skater starts from rest and accelerates at 0.21 m/s square for 15s. a) Find her final velocty and total kinetic energy after the 15s of travel. b) If she exerts a breaking frictional force of 280N, find her stopping distance. Homework Equations...

Homework Statement We know cyclic integral F(r).dl=0 => curl F(r)=0 and F(r) is a conservative vector field. What if the vector field is NOT a function of r(x,y,z)?Suppose,F is a function of velocity or time...i.e. F=F(v) or F=F(t).Say we do not know v=v(r) or t=t(r).In that case will the...

Homework Statement A bullet of mass m moving with velocity V_o crashes into a block of mass M at rest on a frictionless horizontal surface the block is sitting at the edge of a table that is H high. When the bullet hits the block it flies off the table and it lands a distance x from the bottom...

Homework Statement As measured in Earth's frame of reference, two planets are 491,000 km apart. A spaceship flies from one planet to the other with a constant velocity, and the clocks on the ship show that the trip lasts only 1.10 s. How fast is the ship traveling? (Enter your answer to 4...

Doppler effect homework problem help (still lost) Homework Statement A block with a speaker bolted to it is connected to a spring having spring constant k = 17.0 N/m, as in Figure P17.40. The total mass of the block and speaker is 44.00 kg, and the amplitude of this unit's motion is 0.475...

A container of mass 4kg on a shelf is supported by a strut as shown. The container is evenly loaded and it is centrally placed on the shelf. (Ignore the weight of the shelf) http://img256.imageshack.us/img256/1038/7bq4tx9.gif a) What are the three forces acting on the shelf? b) What is...

Really stuck at this question. In an experiment on sound interference, two sources A and B are placed 2m apart. As a girl walks from X to Y she hears a point of maximum loudness ar point P and the next at point Q. Using information from the diagram below find distances AQ and BQ...

Homework Statement If the diameter of a manometer is increased, what effect will it have on height difference and individual heights of a liquid?

Homework Statement Positive charges are situated at three corners of a rectangle, as shown in the attachment. Find the electric field at the fourth corner. the numbers are: bottom left- 3.00 nC bottom right-5.00 nC top right- 6.00 nC the length of the rectangle is .6 m and the width...

I'm new to op-amps, and would like some guidance. I have a quick question on this HW problem. I'm not asking you to do it for me, but I want to see if my hunch is correct: http://img66.imageshack.us/img66/8872/screenshot01bb7.jpg Now, using ideal op-amp model... I'm going to assume: V+ = V1...

Homework Statement f(x) is a piecewise function defined as: 2(2e-e^x) x<1 3\pi x-4 x>=1 Discuss the continuity of f(x) at x=1. Homework Equations The Attempt at a Solution Putting x=1 in the above function gives you 2e and 3\pi -4. They seem to be equal, but how do I...

Homework Statement I wasn't sure if i was doing this problem correctly, if anyone could double check for me, that would be great! You ride your bicycle down a hill. Your total mass is 40 kg. At the top of the hill, your speed is 5 m/s. The hill is 20 m high and 200 m long. If the force of...

I need a bit of help here. I have an upcoming assessment towards bridge design. The task is to create and construct a bridge made out of dried spaghetti sticks. The bridge is to be as light as possible while holding the most weight. I currently have 1 main design I'm leaning towards, but I'm...

Hello. Homework Statement There is a link to the problem and its picture here: http://media.wiley.com/product_data/excerpt/19/04717580/0471758019-1.pdf It is # 46. Here is the problem as well: In Fig. 4-44, a ball is thrown up onto a roof, landing 4.00 s later at height h=20.0m...

Homework Statement (9^(3/x))^4 (without calculator) Homework Equations a^n/m = m'root'a^n The Attempt at a Solution adding the powers: 3/x*4/1 = 12/x 9^12/x x'root'9^12 = ? ---------------------- Ok, it's supposed to be 27, but how can you know something that are...

Hello all. I am new to this forum and I'm glad I found this place! Anywho, here's the problem I'm stuck on... Three equal charges 4.4 micro coulombs are located in the xy-plane, one at (0m, 63m), another at (52m, 0m), and th third at (49m, -53m). Find the magnitude of the electric field at...

RLC Circuit Homework Problem Thia last HW problem is stumping me. This is my first year of physics class, and I am working on some homework problems tonight. It's the last m/c question out of 30 that I am doing tonight, and I'm having a bit of trouble figuring this one out: Question...

Homework Statement What is the acceleration of your car? Time [s] Velocity[ms] 1 8.8 2 12.82 3 16.25 4 20.46 5 24.22 6 28.09 7 31.77 8 35.24 9 39.32 10 42.37 11 44.61 12 46.63 13 49.01 14 50.53 15 52.1 16 52.32 17 53.6 18 53.44 19 53.74 20 53.25...

Hi, I have been struggling a little with this question. Scuba divers breathe a mixture of O2(g) and He(g) to avoid "the bends, a condition caused by nitrogen in the blood. If 65.0g O2(g) and 2.00g He(g) are placed in a 5.0L tank at 25oC, calculate: If the average human takes 15 breaths...

I am trying to do the problem below but I don't understand how to do it. Can you please show me how to do it? DON'T give me the answer, explain to me how to get the answer. http://img134.imageshack.us/img134/9168/untitled1au7.jpg Point C moves at a constant rate along semicircle centered...

How do I show that T_n(x)=\cos(n\arccos(x)) are actually polynomials of degree n? If n=2 then T_2(x)=x^2-(1-x^2) but this seems to break down as n increases.

How far from Jupiter must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances Jupiter's pull? i know that i need to use m1/r2=m2/((2.78e-11)-r)squared but my answers keep coming out wrong. For an answer, i got 2.4e7 km

I have all of my question pretty much divided out into formulas and just need some help with with what i am putting into it. The question reads, a 330kg piano slides 3.6m down a 28degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The...

2N2O5 heat-- 4NO2 + O2 1.618 g of O2 are produced, how much NO2 in grams are produced? I got 9.30 g NO2, is that right? I used 1 mol O2 = 32 g O2, and 1 mol NO2 = 46g NO2. I first converted g O2 to Mol O2 then used the balanced equation to convert from mol O2 to mol NO2, then converted to NO2...

2N2O5 heat-- 4NO2 + O2 1.618 g of O2 are produced, how much NO2 in grams are produced? I got 9.30 g NO2, is that right? I used 1 mol O2 = 32 g O2, and 1 mol NO2 = 46g NO2. I first converted g O2 to Mol O2 then used the balanced equation to convert from mol O2 to mol NO2, then converted to...

Suppose there is a tree of unknown height. I am standing 76 meters away from the tree and the top of the tree is 32 degrees from where I am standing. Could I find the height of the tree by this: 76 cos(32) =64 76 sin(32) =40 Magnitude = SQRT 64^2 + 40^2 Height of Tree equals 75 meters??

I been stuck on this homework problem for about an hour. A truck covers 40.0 m in 8.25 s while smoothly slowing down to final speed of 2.05 m/s. (a) Find the truck's original speed. m/s (b) Find its acceleration. m/s2 I was told to use this V^2 = Vo^2 + 2AdeltaX but became lost.

http://tinyurl.com/hjybb thats a picture of the problem, anyone know how to solve it??

[B][/B I have a question here. Please can someone solve this. The question is: There are 7 students of whom 2 are Americans, 2 are Russians and 3 Indians. hey have to stand in a line so that the two Americans are always together and the three Indians are always together. In how many ways...

two vertical poles PQ and ST are secured by a rope PRS going from the top of the first pole to a Point R on the ground to the top of the second polle. Show that the shortest length of rope occurs when \theta_1=\theta_2 I have found eqn and found the derivative, what do I do to show that it...

Wondering if someone could help me get this answer. I don't get spherical coordinates at all. The volume of the region given in spherical coordinates by the inequalities 3 less than or equal to rho less than or equal to 5 0 less than or equal to phi less than or equal to pi/6 -pi/6 less...

Hello, i have been asking a lot of question lately, i had 60 questions to do for hw, and I'm kinda confused on some of them... A 0.5kg block is placed on top of a 1.0kg block, the coefficient of static friction between the two blocks is 0.35. The cofficient of kinetic friction between the...

I was wondering about these questions. Please guide me. 1) We cannot drive a car on ice because there is no force on the car which acts horizontally. It means that when we press the accelertor, we provide only the rotational motion to the wheels. Now, when we drive on a road, friction provides...

Hi guys, Couldn't figure this question out even after some thinking through. Hope someone can help me here. 2 loudspeakers are placed 1.2m vetrically apart. The point A is the horizontal distance of 1.6m from the top speaker. Both speakers are operating in phase with a steady freq of 400Hz...

This question, from a previous A.P physics exam, was given as a homework problem. I am wondering if anybody could tell me if I am on the right track or totally wrong. Three blocks of masses 1.0, 2.0, and 4.0 kilograms are connected by mass less strings, one of which passes over a...

so here i am doing my physics homework. everythings fine, but then i get this whopper of a problem, which is for major marks, and i can't seem to solve it for some reason. here she is: a ramp is setup on the edge of a table a ball slides down this ramp and picks up speed. just as...

2c\int_{x=-a}^a\int_{y=-b\sqrt{1-\frac{x^2}{a^2}}}^{b\sqrt{1-\frac{x^2}{a^2}}}\sqrt{1-\frac{x^2}{a^2}-\frac{y^2}{b^2}}dydx Can you help me with this integral?

I have this problem that I'm not sure I am on the right track. The problem is A .20 kg billiard ball traveling at a speed of 15m/s strikes the side rail of the pool table at an angle of 60 degrees. If the ball rebounds at the same speed and angle, what is the cahnge in its momentum. I have the...

Hello. I was hoping someone could give me a direction to go with this homework problem. I'm having trouble trying to figure it out. Here's the question: Two people relaxing outdoors listen to a bird sing. One person, only 1.00m from the bird, hears the sound with an intesity of 2.80x10^-6...

what is the resultant time period when two simple harmonic motions of time periods 3s and 4s superimpose

A monkey throws a 25kg coconut from the top of a 15m high redwood with an initial velocity of 10 m/sec at an angle of 30 degrees. Find the following: A)Maximum height relative to the foot of the tree B)TIme for the entire journey C) Distance from the foot of the tree where it lands D)KE at the...

Hello all. I am new to this site and was hoping someone could help me with a homework problem I'm trying to do. Here's the problem: A small ferryboat is 4.0m wide, 6.0m long. When a loaded truck pulls onto it, the boat sinks an additional 4.0cm into the river. What is the weight of the...

Hey a friend asked me for help on his physics homework, and I found this place and was wondering if you guys could help me out. 2: In 1772, the famed Italian-French mathematician Joseph Louis Lagrange was working on the infamous three-body problem when he discovered an intersting quirk in the...