Stuck Definition and 836 Threads

HELP! 3 physics problems that i am stuck on Help me out guys. I am in a college physics class and a week and a half into the class i am stuck. 1.) A bullet is moving at 244m/s. It hits a tree and penetrates 8.34mm. (A)What is the average acceleration as it slows? (B) Assuming constant...

I'm having trouble figuring these 2 problems out: 4000cm^3 (.004m^3) of oil is spilled onto a smooth lake. If the oil spreads out uniformly until it makes an oil slick 3 molecules thick, with adjecent modlecules just touching, estimate the diameter of oil slick. Assume the oil molecues have...

Hi everyone. My main goal this week is to learn derivatives of trig functions. But before that I'm still learning some of the trig identities and solving some equations. I'm stuck on a couple of questions that I need help on. 1. Express \sec 2 \Theta in terms of \sec \Theta and \tan...

ok here's the problem i haven't taken trig for like 2 years and suddenly i have been thrown back into it... problem: 2 cos 2x - 4 cos x + 3 = 0 0 < x < 2 pi my work (used cos 2 x = 2 cos^2 x - 1) 4 cos^2 x - 2 - 4 cos x + 3 = 0 4 cos^2 x - 4 cos x + 1 = 0 ok now here is my...

from 0 to 3, ( 1 + [ 1/2x^(1/2) - 1/2x^(-1/2) ]^2 )^(1/2) dx I started to foil the ^2 term and then tryed to use the u sub, but It doesn't seem to work out. this problem is killing me!

The fahrenheit temp reading is 90 degrees on a hot summer day. What is the reading on the kelvin scale? I know the kelvin scale is the absolute scale...i'm not sure how to tackle this problem or in other words what equation to use. A 50.0 g silver spoon at 20.0 degrees is placed in a cup...

Well I'm back. I've done most of everything, except for the last part of one problem and one complete problem that has me stumped. First the problem I almost have solved: While visiting friends at Cal State Chico, you pay a visit to the Crazy Horse Saloon. This fine establishment features...

Problem: A glass vial containing a .016kg sample of an enzyme is cooled in an ice bath. The bath contains water and .12kg of ice. The sample has specific heat capacity 2250 J/kg k; the glass vial has mass .006kg and specific heat capacity 2800 J/kg K. How much ice melts in cooling the enzyme...

I've been trying to figure them out but can't get through about 6 questions, these are the other two.. An object is observed to fall from a bridge, striking the water below 2.50 s later. (a) With what velocity did it strike the water? (b) What was its average velocity during the fall? (c)...

What is the mass of a 10.0 cm cubed cube of copper? i know that (g/cm cubed)= copper = 8.96 but I'm not sure how to tackle this problem. also... If I have 51.5 g of a 50.0 cm cubed volume of one of these substances, which would it be? Alumininum 2.70 mass density, Copper 8.96, Iron 7.87...

"On a frictionless, horizontal surface there is a spring with one end fixed and the other attached to a board of mass 1 kg. The spring coefficient is 150 N/m. 500g of clay moving at 3.0 m/s on this horizontal surface collides squarely with the board. As a result, the board and clay stick...

now this is my final module, i have three question a cannot answer click the link to get a pic of what i have done for this perticular question, I'm stuck at the last line i wrote. http://images.cardomain.com/member_images/5/web/557000-557999/557901_30_full.jpg another quetion asks a...

Hi there, I was hoping that somebody could help me. I'm stuck again! :cry: a rod with (lambda) coulombs of charge per meter of its length has the shape of a circular arc of radius R. The rod subtends an angle (theta). Shpw that the magnitude of the electric field at the centre of the...

I'd appreciate a tip here. A 10 kg object on a horizontal, unsmooth table is pushed to the right so as to have an intial velocity of 20 m/s. It comes to rest 5 seconds later, during which time its acceleration (deceleration?) was constant. I've already figured out the acceleration (4 m/s^2)...

Got an integral that for some reason I can't do, very much annoying me because this is supposed to be the stuff I am good at. A nudge in the right direction would be great, here it is: \int \frac{(x+2)dx}{\sqrt{x^2+6x+4}} I have attempted completing the square on the bottom to get...

integral of 10/((x-1)(x^2+9)) dx integral of x^3/((x+1)^3) dx both these are under the partial fraction section, so using those methods would be helpful... thanks!

An object weighing 34 lbs. is attached to a spring with spring constant 1 lb/ft. This spring-mass system is subject to a damping forece numerically equal to twice the velocity. At time t=0 the object is lowered 3 inches below its equilibrium position and given an initial velocity of 1 ft./sec in...

A 35.0 kg block at rest on a horizontal frictionless table is connected to the wall via a spring with a spring constant k=25.0 N/m. A 3.60×10-2 kg bullet traveling with a speed of 490 m/s embeds itself in the block. What is the amplitude of the resulting simple harmonic motion? Okay. So If...

Hi, I am doing chemistry at my school, and I am currently stuck on a couple of questions that I don't know how to complete. Here are the questions: ------------------------------------------------------------------------------------- Question 1. An 8.75g. sample of iron wire was dissolved in...

I am having trouble getting to grips with moments and couples and i have got stuck on the following question: "A uniform horizontal rod AB is 120cm long and weighs 250N. It is supported by two veritcal wires, one 10cm from A and the other 20cm from B. Loads of 100N and 350N hang from the...

A brass ring of diameter 10.00 cm at 19.5C is heated and slipped over an aluminum rod of diamter 10.01 cm at 19.5C. Assume the average coefficients of linear expansion are constant. a) To what temperature must this combination be cooled to separate them? is this possible? b) If the aluminum...

I have to find the principal root of \sqrt[3]{8 i} But I get stuck at this part change this to polar coordinates... r= \sqrt {x^2 + y^2} which makes r=8 but when I try to find \theta \theta = \arctan \frac{y}{x} from the original x = 0 so how do I find \theta?

Here is the pblm, but i can't seem to get a foothold as where to start. I've tried starting with Kirchov's Laws, but can't see to get anywhere with them. Plz help. *One type of ohmmeter consists of an ammeter connected to a series resistor and a battery. The scale is different from...

https://hw.utexas.edu/tmp/Muddam1/1077041275Xuj.pdf I'm stuck on fourteen. Without the charge's coordinates how can I calculate the electric force on the charge?

Stuck on surface charge density problem. Calculate the surface charge density for a solid spherical conductor of radius .438m if the potential is .876m from the center of the sphere is 1.87kV. Answer in units of C/m^2 Ok I did this: V= Kq/r q= V*r/k q= 1.87e-3*.876/8.99e9 q= 1.822e-13...

I am having trouble with a HW question that has been driving me crazy for a few days now. I have to solve for W ( a hanging weight) that will not cause either T1 or T2 to exceed 1050N. So far I have drawn the free body diagram that is attached as a word doc, and the angles I found based on the...

Hi this is an AS physics question that i am stuck on. I tried it but I don't get the answer it says in the answers. A girl diving froma 15m plstform wishes to know how fast she enters the water. She is in the air for 1.75s and dives from rest(with an initial speed of zero). What can you...

Section 11.6 of Ray D'Inverno's book Introducing Einstein's Relativity This section shows Palatini's approach in using an equivalent Lagrangian to obtain the vacuum field equations of GR and the connection. From equation 11.39, we already have...

1. Calculate the volume of a 5.00 carat diamond. 2. Calculate the force applied to the top of a diver's head (A=300cm^2) by the ocean (rho=1025kg/m^3), if the diver is a) 3.00m below the surface b) 15.0m below the surface 3. Normal atmospheric pressure at sea level is generally considered...

I'm stuck can anybody help me? (Note: I'm looking for the length.) 1,800cc-72cm=L What do I do next?

Hey, since I am doing distance learing, my assignments don't have a date they have to be in, however I have been stuck on two questions for aBOUT 2 months now. 1) A 0.25 kg soccer ball is rolling at 6.0m/s toward a player. The player kicks the ball back in the oppoiste direction and gives...

Hi. I am trying to solve for two things here. I need the speed of mass 1 when mass 2 hits the ground, and I need to find out how high mass 1 will climb before returning to rest. Mass 1 is 3kg, mass 2 is 5kg, and they are connected by a light pulley and string. mass 2 is elevated 4meters...

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I've added a picture that's part of the problem. A sailboat race course consists of four legs defined by the displacement vectors A, B, C and D shown above. The values of the angles are È1 = 420, È2 = 410, and È3 = 270. The magnitudes of the first three vectors are A = 3.7 km, B = 5.3 km...

a drag car's tires have some of the highest friction coefficients, so the book says. it takes 6 s to go a quarter mile (about 402.5m) with constant acceleration, no skidding what is the coefficient for the static friction? A CORRECTION HAS BEEN MADE, IT IS 402.5m NOT 602.5

I was doing some self-studying from Fundamentals of Physics Extended Fifth Edition, and I am stuck on Question 72. I am sorry about the fact that this problem would only be limited to those who have the book (I don't know how to put the diagram onto the internet). Any suggestion is suggested.