Recent content by Pete789

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    What is the estimated battery life?

    Ok this is my answer. Aver E = 170kg*8.3^2*0.12=1405.35w or 1.405kw The Battery has 7.5kwh so 1.405/7.5= 5.3 hrs of use Thanks Peter
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    What is the estimated battery life?

    Thanks Berkeman, However, the only other information my teacher gave me was The average power required to maintain the battery = M*V^2*fr = W M= 176kg V=13.8ms Fr=energy usage fraction= 12% Any ideas? P789
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    What is the estimated battery life?

    Homework Statement Electric motor in put power rating is 17.5kw Voltage is 48V Battery is 7.5kw/h Average W needed to maintain motor per sec is 1446.7W Homework Equations Motor: W=I*V > I = 364.58Amps The Attempt at a Solution My attempt: If 1kw = 3.6 x10^6J > 7.5 * 3.6 x 10^6 =...
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    I can't work out how to use my calculator pleae help exam sunday

    Yep right, got it thanks Steamking. Now it works Peter
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    I can't work out how to use my calculator pleae help exam sunday

    [b]1. I have two calculators. including the Texas inspire cx. I can't make either of them work reliably on trig questions. I have an exam sunday and i need to be sure how to use my inspire. [b]2. Summation: [50][0.5] + [50][0.07cos35] + [100][0.1cos35] = 13.55 [b]3. Now i got this formula off my...
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    What is the net force on a door with multiple forces acting on it?

    Right thanks Phan, My teacher answered me to say that Anti clockwise forces are given a negative notation and Clockwise forces a positive notation. Although you can swap those values around, i think it is a good bookeeping excercise - as opposing forces are negative. which is where i went...
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    What is the net force on a door with multiple forces acting on it?

    Homework Statement A regular house door has 3 forces acting on it.At the moment the door is open by 35 deg. Let's say two children are pushing on a door and mum is on the other side pushing back 1/ at 0.05m is 50N acting directly perpendicular to the door 2/ at 0.07m is 50N acting at right...
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