Recent content by Dan Feerst

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    Activation of a solenoid via induction

    First and foremost, I admit that this was not my strong point in physics. I am trying to construct a realistic model in excel or maple which could be used to predict induced voltage in a solenoid based on it's distance to a virtually infinite extremely high voltage, power source. The source...
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    Deceptively difficult material balance problem. HELP

    I have been working on what I thought was an easy problem. This was a one hour quiz in which the whole class failed, the instructor decided to give it as a homework assignment instead. ------problem start--------- Considerable interest exists in the conversion of coal into liquid products...
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    Calculating Heat and Time for 150g Water and 50g Ice System at 0C to Reach 100C

    No, believe me, I do appreciate your help. but I would rather go elsewhere than deal with rude comments. If you feel that I should set your comments aside then maybe you shouldn't be making them in the first place
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    Calculating Heat and Time for 150g Water and 50g Ice System at 0C to Reach 100C

    Alright, I admitted I didn't know what I was doing, you don't have to be a jerk about it. anyway, I tried it again, and I think I see where I screwed up, I skipped too many steps. This time I got an answer of 64.7C which makes a bit more sense. question... well two actually. I used 200g...
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    Calculating Heat and Time for 150g Water and 50g Ice System at 0C to Reach 100C

    It seems like that should be mathematically equivalent. I suppose I just don't completely follow. If all of my Q values from the system are in equilibrium at 100C, I would think I could set it equal to the heat of the final cube to get the final temperature. If this is correct, I can't see why...
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    Calculating Heat and Time for 150g Water and 50g Ice System at 0C to Reach 100C

    I've never had to do one quite like this. Just wanted to check my work. Homework Statement 150g of water and 50g of ice are in a container made from 20.0g of aluminum. The system consisting of the water, ice and the container are at thermal equilibrium at 0C. The container is wrapped in a...
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    Change in kinetic energy

    Homework Statement a block of ice slides down a frictionless ramp at angle Θ = 52.0° while an ice worker pulls on the block (via a rope) with a force that has a magnitude of 52.0 N and is directed up the ramp. As the block slides through distance d = 0.8 m along the ramp, its kinetic energy...
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    Work done on an object being lifted

    Not carefully reading the question apparently. :)
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    Work done on an object being lifted

    Wait. Are you saying the question is wrong?
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    Work done on an object being lifted

    Homework Statement A helicopter lifts a 72 kg astronaut 10 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/16. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches...
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    Calculating Average Velocity: Solving a Train Motion Problem in Physics

    Homework Statement A train at a constant 42.0 km/h moves east for 33 min, then in a direction 64.0° east of due north for 25.0 min, and then west for 69.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of...
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