Recent content by e.pramudita

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    Relationship of W and v in a region of uniform magnetic field

    Homework Statement https://dl.dropbox.com/u/63664351/Physics/Electromagnetic%20Induction.PNG https://dl.dropbox.com/u/63664351/Physics/Electromagnetic%20Induction%20Answers.PNG Homework Equations W=mas. Unknown relation between W v and BThe Attempt at a Solution dW = m a ds = m dv/dt ds dW/dv...
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    How Many Quadratic Equations Can Be Formed With Real Roots?

    How about the second part?
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    How Many Quadratic Equations Can Be Formed With Real Roots?

    There is a restriction
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    How Many Quadratic Equations Can Be Formed With Real Roots?

    Can you give more explanation on how to solve it?
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    How Many Quadratic Equations Can Be Formed With Real Roots?

    Homework Statement If three different number are taken from the set {0, 1, 3, 5, 7} to be used as the coefficient of a standard quadratic equation, how many such quadratic equations can be formed? How many of these have real roots?Homework Equations The Attempt at a Solution Part a: "How many...
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    Reaction Force On Ladder and Wall Case

    Homework Statement https://dl.dropbox.com/u/63664351/Physics/MECH1.PNG Homework Equations Sum of Forces and Torque = 0 The Attempt at a Solution I found similar problem here: http://farside.ph.utexas.edu/teaching/301/lectures/node133.html Why is there no vertical reaction on a...
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    How Do You Determine the Direction of a Magnetic Field in Wire Configurations?

    Homework Statement https://dl.dropbox.com/u/63664351/Physics/ELEC1.PNG Homework Equations http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html https://dl.dropbox.com/u/63664351/Physics/Magnetioc%20Force%20Between%20Wires.PNG The Attempt at a Solution We want the tension to be zero...
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    Parallel Plate Capacitor having equal charges on plates

    Ah sorry I posted in the wrong thread. Can't delete. Edit only. Sorry I'm a newbie.
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    Calculating height given pressures and temperatures

    Thanks!
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    Engineering in Higher Education - significant figures

    Isn't this what lead to the failure in 10th mission of Space Shuttle disaster? Finally Richard Feynman, a physicist, is the one who uncovered the cause of the disaster despite his inexperience with NASA and outer space mission. During his investigation he also found out that there were very...
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    Engineering in Higher Education - significant figures

    Engineering in Higher Education -- significant figures I am currently in my 4th semester. It seems that every engineering textbooks I encounter have no regard of significant figures (SF). Every problems and examples I encounter are like that. Mostly integers, some have decimal figures, but...
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    Calculating height given pressures and temperatures

    Thanks you all for your responses! Still confused with conversion. For example \ln \frac{46°F}{70°F} ≠ \ln \frac{506°R}{530°R} If the units inside ln are the same, then the number inside ln is without unit (the units cancel each other). Thus how come the calculations above are not equal...
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    Calculating height given pressures and temperatures

    Homework Statement On a certain day the barometric pressure at sea level is 30.1in.Hg, and the temperature is 70°F. The pressure gage in an airplane in flight indicates a pressure of 10.6psia, and the temperature gage shows the air temperature to be 46°F. Estimate as accurately as possible the...
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    Fluid Statics - Forces on Submerged Surface?

    QUESTION Rainwater collects behind the concrete retaining wall shown in the figure. If the water saturated soil (specific gravity 2.2) acts as a fluid, determine the force and center of pressure on a 1-m width of the wall. PROBLEM 1. What does it mean by 1-m width of the wall? Is it 1-m...