Exam Definition and 886 Threads

Need help with Vertical Velocity! I have an exam tomorrow >.< I went to a tutor yesterday to get it all worked out, but I forgot to write down D in my notes! How do I solve for D? I have the answer, but no equation to work it. You jump horizontally with a speed of 2.7 m/s off a diving board...

Homework Statement https://aapt.org/physicsteam/2010/upload/2009_F-maSolutions.pdf # 18 Homework Equations T = 2∏√(L/g) The Attempt at a Solution Honestly, I'm not sure how at all to do this question. All I know that the distance from the small peg to mass m is L/3 - so that should...

Homework Statement An object is thrown with a fixed initial speed v0 at various angles α relative to the horizon. At some constant height h above the launch point the speed v of the object is measured as a function of the initial angle α. Which of the following best describes the dependence of v...

Homework Statement http://www.aapt.org/physicsteam/2010/upload/2010_FmaSolutions.pdf See Number 24Homework Equations CoM = M1x1 + M2x2 / (M1+M2) MOI_disk: 1/2mr^2 The Attempt at a Solution So what I was thinking was find the new CoM then use the parallel-axis theorem. To find the new CoM: MsXs...

Homework Statement See: http://www.aapt.org/physicsteam/2010/upload/2010_FmaSolutions.pdf #15, 16 Homework Equations U_o + K_o = U + K v_CoM = vM1 + vM2 / (M1 + M2) The Attempt at a Solution I thought that for 15 it was simply: 1/2mv^2 = mgh h = v^2/2g But this is wrong, so...

Homework Statement https://aapt.org/physicsteam/2012/upload/exam1-2011-1-3-answers_1.pdf Number 13 Homework Equations Rolling objects: E = 1/2mv^2 + 1/2Iw^2 I_cylinder = 1/2mR^2 Torque = rf(perp) Torque = Iω = rfsinθ The Attempt at a Solution No idea how to proceed. Most likely...

Homework Statement 12. You are given a large collection of identical heavy balls and lightweight rods. When two balls are placed at the ends of one rod and interact through their mutual gravitational attraction (as is shown on the left), the compressive force in the rod is F. Next, three...

Homework Statement 9. A spring has an equilibrium length of 2.0 meters and a spring constant of 10 Newtons/meter. Alice is pulling on one end of the spring with a force of 3.0 Newtons. Bob is pulling on the opposite end of the spring with a force of 3.0 Newtons, in the opposite direction...

Homework Statement 8. When a block of wood with a weight of 30 N is completely submerged under water the buoyant force on the block of wood from the water is 50 N. When the block is released it floats at the surface. What fraction of the block will then be visible above the surface of the...

Woops, it's the 2010 exam -- my bad.Homework Statement They have diagrams that I'm not sure how to display; so find them at the following link: https://aapt.org/physicsteam/2010/upload/2010_Fma.pdf These are #'s 19 and 20 and they refer to the PE graph in 18. Homework Equations Not sure...

Homework Statement 19. A 1,500 Watt motor is used to pump water a vertical height of 2.0 meters out of a flooded basement through a cylindrical pipe. The water is ejected though the end of the pipe at a speed of 2.5 m/s. Ignoring friction and assuming that all of the energy of the motor goes...

Homework Statement A block of mass m1 is on top of a block of mass m2. The lower block is on a horizontal surface, and a rope can pull horizontally on the lower block. The coefficient of kinetic friction for all surfaces is μ. What is the resulting acceleration of the lower block if a force F...

Homework Statement Which of the following sets of equipment cannot be used to measure the local value of the acceleration due to gravity (g)? (A) A spring scale (which reads in force units) and a known mass. (B) A rod of known length, an unknown mass, and a stopwatch. (C) An inclined...

Homework Statement 3. An equilateral triangle is sitting on an inclined plane. Friction is too high for it to slide under any circumstance, but if the plane is sloped enough it can “topple” down the hill. What angle incline is necessary for it to start toppling? (A) 30 degrees (B) 45 degrees...

Homework Statement Four objects are placed at rest at the top of an inclined plane and allowed to roll without slipping to the bottom in the absence of rolling resistance and air resistance. • Object A is a solid brass ball of diameter d. • Object B is a solid brass ball of diameter 2d. •...

19. Which imaging method is contraindicated (not allowed) for patients with a titanium dental implant? a) CT b) MRI c) PET d) SPECT e) mammography I thought the answer was MRI, but the correct answer is PET. Can anyone explain why this is. Thanks.

Water flows through a rigid tube, the radius of which is 1 cm. What will be the velocity of flow in a part of the tube with a radius of 3 cm? Please show your working and any equations that you use, no matter how basic you think it is. If there is no working to show then just explain how you...

ΔHomework Statement I'm preparing for my first year university physics exam and was wondering if the PF community could give me some 'more difficult' problems that I could work on. If you could can the problems involve combinations of topics (ex. relative motion, kinematics, dynamics...

Homework Statement Attached is the problem. This is the June 2010 AS Physics exam unit 4 question 16 (Edexcel) Homework Equations See the attachments. The Attempt at a Solution Q 16. (a) The voltage is always positive and so although the current must vary it is always positive and so the...

I have a big exam on Wednesday. It's the last one before the drop date. I just need all of the help I can get. Any help would be appreciated. Here is where I am right now: I want at least a B on this test. Made very bad grades on first two tests. However, if I get good marks on last two...

So my prof. has not replied to my e-mail, so I was wondering if someone here can help me understand why the MLE for a random variable X~Unif(-θ,θ) is max|Xi|. Attached is the problem as well as my attempt for the solution. Here is my thought process: Upon sketching the graph, I thought the...

Capacitor Resistors problem, URGENT PLZ, exam preparation Homework Statement In the following transient circuit, assume at t<0, the circuit is at steady state. Assume vc(t) is the voltage across the capacitor and v0 (t) is the output voltage as shown: Find (a) vc(0+) (b) vc(∞) (c)...

Okay there is a particular equation in my book, which I just can't seem to understand intuitively. I've been staring at it for an hour now without progress, so I hope some of you can explain it. Basically it's the one on the attached picture. Let me introduce the notation so you can help me...

Homework Statement Hey all! Ok, doing a simple implicit differential. x^3 + y^3 = 6xy The 6xy is messing me up! How do I differentiate that?? The book says 6xy turns into 6y + 6xy' I do not understand how to differentiate 6xy (how the x and y are stuck together) Ok...

I think I just failed an exam :( Ok so I am realistic about my life. I know I'm pretty much a failure. Anyway I had a lot of luck about 4 years ago and got into a great job as a data analyst. It suits me 100% at this stage as I get to do things which interest me, write code ect, basically I...

correction -->it should be a high-level exam question. Homework Statement Two ships A and B move with constant speeds 48 km/h and 60 km/h respectively. At a certain instant ship B is 30 km west of A and is traveling due south. Find (i) the direction A should steer in order to get as close as...

Hello, I have a question regarding the F=ma exam. I am a US citizen living abroad for the past few years, and I was wondering if the exam is administered outside the US. I don't really fall under the needed category in my current country. Thanks!

I am writing to ask you for advice on how I should go about studying for the upcoming Classical Mechanics exam. I would only be satisfied to get an A, nothing less, so I am willing to work hard. Although I realize that preparing for the midterm exam begins when the semester starts, I don't feel...

Hey everyone, So I got a D+ on my first Physics exam. I always have a goal of achieving straight A's in a semester and now I feel that that's gone down the drain. Maybe one of you guys can help me out here. The worst test (out of 3) is only worth 10% of my final grade (assuming that this test...

Hi, First of all, I don't have much difficulties learning stuff for exams in general. Though, organic chemistry seems to be the hardest subject I ever had. Not because I find it too difficult to understand, it's because of the quantity. I don't really know how to properly prepare for my exam...

Homework Statement I would like to check my answers for #3 on this practice exam: http://cyclotron.tamu.edu/dhy/sample_exam1_phys218.pdf Homework Equations The Attempt at a Solution b) v(plane-wind)x = 30cos30 v(plane-wind)y= 30sin30 + 160 c) 8.44° East of North d) 1.4...

After getting back a result in an Abstract Algebra exam (In which I only got 70%), a result just below the class average I am having extreme doubts about my ability to become a mathematician. The real shock was that I believed I understood the material well enough to get at least 90%. I am...

Homework Statement I just remembered another question that I wasn't to sure about 1) if n1xn2 does not intersect the plan then n1xn2=0 I chose false for this one. thoughts? Homework Equations The Attempt at a Solution

Homework Statement So I took my calc 3 exam today and had this question true or false magnitude ( v+v) = 2*magnitude( v) I put true. Thoughts? Homework Equations The Attempt at a Solution

lets say? Exam worth: 70% exam percentage scored: 40% what is the exam mark?

Greetings everyone, This is my first time ever taking a physics class. It is calculus based college class but not for engineers. In general, what is the best method to prepare for a physics exam? Because I have never taken one, I am not sure how they are typically formatted and such...

Homework Statement (This was a problem in an examination test of physics) Problem: point 1) Make an example of conservative force; point 2) Write the vectorial expression point 3) Choose a coordinate system and find the expression of the potential energy in a generic point in the space...

I've been self studying AP Calc AB over this past month, and I just took a practice AP Exam. It is the first AP Calc AB test in the princeton review's ap calc book 2010 edition. I got 31/45 on the MC and roughly 50% of the FRQ's correct. Could someone estimate what I got between 1-5? Thanks!

hey i am from India is there any any good book dealing with problems similar to experimental part of physics olympiad which is available in india. or any site which has videos on physics experiment.

Could anyone Putnam veterans or Putnam coaches tell me what the real per-requisites are to succeed in the Putnam exam? Because they say the Putnam exam only requires Calculus and I think that's completely garbage. What courses should one have in his arsenal if he wishes to be successful in...

Hi all, I remember my school days when i used to be a very excellent student of my class. I got admission in an engineering institute. I moved to other city for my studies. I rented a room to live in that strange new crowded city. No mom there. I've always been a mamma's boy. With the help...

i want to submit to some universities like as Cambridge, Harvard, Stanford and ... application requirement for these universities are SAT general and subject, but I don't anything about this exam. can you help me

Hi all, I would like to take an official version of the ACS exam for Organic Chemistry, but I cannot find out how to do this. I took an old version as part of my 2nd Semester Community College OChem Final, but those scores don't count officially. I really want to take a current version soon...

I'm doing AQA Physics A unit 5 next Monday, and I've been doing some past papers but I'm not sure about how to answer questions on the energy released in nuclear reactions. The mark schemes say that the energy released is equal to the change of binding energy per nucleon but I thought that the...

Homework Statement A hockey puck of mass 0.200kg is sliding along a smooth, flat section of ice at 18.0m/s when it encounters a patch of snow. After 2.50s of sliding through the snow it returns to smooth ice, continuing at speed of 10.0m/s. a) What is the change in momentum of the puck...

Homework Statement I've spent the last hour trying to get this, and it's starting to drive me crazy! I'm not sure how to approach the waveform, as there are two forms? I'm guessing that the period in this case is 4 seconds, and they've included a second wave to reiterate that? Homework...

I am capable of solving momentum problems but am looking for a way to make things easier / provide a second method as a check-point... If two objects (lets assume they are of different mass as I know the problem works for objects of the same mass) collide (as in the attachment where V = initial...

So basically, this one question messed me up in my maths exam today. Everything we went over yesterday concerning tangent lines/derivetives I went pretty well in. The question was. There are two lookout points. A and B. There is a campirefire at a bearing of 40 degrees from A. From point B, the...

Homework Statement This is a question from an old exam. The answer I have is marked wrong but I do not know why. A conducting sphere of radius a is at potential V and sits at the center of a conducting spherical shell so large that it can be considered infinite and whose potential is...

Homework Statement 1/(1-cos(z)) Homework Equations taylor expansion at 0 for cos(z)=1-x^2/2+x^4/24 and so on. 1/(x^2/2+x^4/24...) The Attempt at a Solution Because all of the powers are negative wouldn't that make it a essential singularity and 0 + 2∏n. Also it just explodes at...