1. F

    induced emf in a solenoid due to a rotating magnet

    Hey, I have come up with an idea for my EEI to measure the emf induced in a solenoid by a rotating magnet when the solenoid is not directly above the magnet (such that the magnetic field is not uniform). Previously I had to perform an experiment where the solenoid was on axis (see picture) and...
  2. pittsburghjoe

    Are we past due to declare EM/Light/Waves its own dimension?

    If we set a dimension for the unobservable, we may stumble on a unifying theory for the large and small. 3D + Time + Waves When I say Waves, I'm talking about the waves a particle becomes when it is unobserved and going through the double slit. If waves only exist as math, observation...
  3. K

    I need a start on this Physics problem due in two days

    ***Will update from this thread on attempts really hope the lovely community here can first give me a push and see what I've got PROBLEM: This light path for the Michelson–Morley experiment was described at the different inertial frames as follows: for the moving coordinate system, the...
  4. S

    Impact energy due to a pendulumn

    Hi, Im trying to create a experimentation where I want to replicate a G force of 40G on one of the automotive component using a pendulum mass. How do we calculate impact force generated on a rigid rod inclined at 20deg rearward from vertical when impacted with a pendulum mass of 5Kg is...
  5. F

    Basic Physic Problem -Accelaration due to Gravity

    A baseball is thrown straight up with a speed of 13.2 m/s. How fast is the baseball after 2.00 sec? In which direction is the ball traveling at this point?
  6. M

    calculate the temperature due to Power loss over a res.

    Hi All, Having the following problem I am trying to solve I am an electronics guy some of e physics eludes me in my calc. Here goes.... I am supplying 125Vac into a R which is a 20kohm resistor where I have a 12V zener in series to GND. P_loss = (125Vac - 5V)^2 / R P_loss = 0.72W So lets...
  7. G

    Calculating Pressure due to Containment of Hydrogen Ions

    I’ve been doing some hobbyist-research and modelling in MATLAB relating to the confinement of hydrogen ions (pure protons). I have written a few scripts including one to determine an estimate of the work required to compress a large number of H+ ions, by considering an evenly spaced stationary...
  8. O

    Temperature Increase due the radiation absorption

    Hello Everyone, I am trying to understand how to calculate the temperature increase due to the absorption of radiant energy by an object that can be approximated by a blackbody (emissivity and absorptivity close to 1). As radiant energy is being absorbed, the body temperature increases until...
  9. L

    Loss due to contraction vs loss due to expansion

    I was told that the friction loss due to expansion is bigger than the friction loss due to contraction because of flow separation , is it true ? why ?
  10. P

    Calculating energy released due to fission of heavy nucleus into equal nuclei

    1.*The problem*statement, all variables and given/known data There is this university exam question:Draw the nuclear binding energy curve and and show that energy is released when a heavy nucleus of*A> 200breaks up into two nearly equal fragments. 2. Relevant equations See below. 3. The...
  11. G

    Potential difference due to attraction

    The other day in my class, my professor said that: 'Whenever you have a force of attraction, the potential will always be negative'. Why is that so?
  12. Z

    How to calculate fluid rise rate and Ra during convection due to density difference?

    I would be very grateful for some help with what is probably a simple problem. I'm a bit of a fluid dynamics newbie. I want to consider natural convection due to density differences, not "forced" convection. For example, a liquid that rises because it is less dense than the surrounding solid...
  13. D

    Physics Questions, Due in an Hour

    Hey guys I just joined here and I know it's a weak cry for help but we were assigned an assignment today without instruction on how to do this and I'm not at my house and won't get home until late(typing on my iphone) I understand physics(98% in the class) I just can't get home and teach myself...
  14. M

    Finding net force and frequency of an oscillation due to charges.

    Two equal magnitude negative charges (–q and –q) are fixed at coordinates (-d, 0) and (+d, 0). A positive charge of the same magnitude, q, and with mass m is placed at coordinate (0, 0), midway between the two negative charges. If the positive charge is moved a distance δ << d in the positive...
  15. F

    total energy loss due to resistance during circular motion

    A tube is bent into the form of a semicircle with centre O and radius r. It is fixed in a vertical plane with its diameter horizontal, as shown in the diagram. A steel ball is held at one end A, and released into the tube. Throughout its motion the ball experiences a resistance of constant...
  16. S

    Resultant magnetic field due to solenoid

    Question (with solution): http://i.imgur.com/hoxk1.jpg 1) How do we know that the given distance makes the solenoid a toroid (=circular)? 2) How is the direction of B_s parallel to the solenoid? 3) How is the direction of B_w perpendicular to B_s? (Please be specific - sorry for asking...
  17. T

    online quiz due tomorrow help!

    A long steel bar with a 3.0 cm x 3.0cm cross section is embedded in a concrete wall 2.0m of the bar extends horizontaly from the wall. If a .75 kg brick is placed at the end of the bar, how far is the end of the bar deflected downward. I've been working on this for soo long I thought you used...
  18. F

    Total force on inner walls due to vertical acceleration?

    A rectangular tank measures 1.5m x 1.5m in cross-section is filled with oil, specific gravity 0.8, to a depth of 2m. Find the total force acting on the inner walls of the tank when a)acceleration is 5m/s^2 upwards and b)5m/s^2 downwards. The answers are a)339.44kN b)315.45kN
  19. U

    Very Tricky Question (Velocity) Due Tomorrow

    040 (part 1 of 2) A motorist traveling at 11 m/s encounters a deer in the road 44 m ahead. If the maximum acceleration the vehicle’s brakes are capable of is −7 m/s2, what is the maximum reaction time of the motorist that will allow her or him to avoid hitting the deer? Answer in units of s...
  20. F

    motion due to gravity

    When an object falls through a liquid, three forces act on it: its weight, the buoyancy and the resistance of the liquid. Two spheres, of mass 0.5 kg and 1.5 kg respectively, have the same radius, so that they have the same buoyancy of 3.2 newtons, and the same resistance formula, 5v newtons...