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  1. S

    Stone is dropped from the top of a cliff

    Mentor Edit: Please don't post complete solutions. Thank you.
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    Non uniform circular motion?

    i'm sorry. i meant that i have mg and tension pointing down. the centripital acceleration is pointing toward the middle of the circle which is not a force. i had a memory lapse. i got it all figured out now. thanks for the help. -andrew
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    Non uniform circular motion?

    i'll give that a try and see if that works. basically i have all three of my forces pointing down. correct?
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    Couple problem

    if you have access to a digital camera you can take a picture of it and then host it online. i usually do this because it is hard to decipher what is going on without a picture. -andrew
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    Non uniform circular motion?

    non uniform circular motion??? A .400 kg object is swung in a vertical circular path on a string 0.500m long. If it's speed is 4.00 m/s at the top of the circle, what is the tension in the string there? i drew my free body diagram and have tension pointing up in the positive y direction. the...
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    What happens after death

    i think after death everything is black and you have no concept of what happened because you are not yourself anymore. you have become some infinite happening that doesn't exist three dimensionally.
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    Newton's laws?

    edit: today she said in class that she left out the part about the frictionless pulley. this makes the problem a little more reasonable.
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    Newton's laws?

    i know. it seems that this problem has a case of ambiguity. i have given you the problem in its entirety leaving out some superfluous information, such as him, what, etc. i just wanted to see if anyone else could make sense of it. i would think that there would have to be a pulley...
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    Newton's laws?

    i think as the climber reached the apex of the climb the bag would approach the floor. -andrew
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    Newton's laws?

    i think the problem is trying to imply that the bag is equal in weight to the athlete, implying that they are in static equilibrium initially. the problem states it explicitly and that is why i refered to it. thanks... -andrew
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    Newton's laws?

    newton's laws???? there is an athlete climbing a rope in gym class. he gets to a point halfway up the rope and is stationary. someone puts a bag of sand that is equal in weight to the athlete. they are both static and then the athlete starts to climb the rope, slowing and speeding up at random...
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    Stratosphere ride in las vegas?

    it's actually a pretty fun ride it is on top of this casino that is 1000 ft high and the ride goes up another 120 ft, so it puts you way up and you can see all of vegas and the surrounding desert.
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    Stratosphere ride in las vegas?

    stratosphere ride in las vegas??? i was going to write a short essay about the forces felt when you are on this ride and i wanted to confirm my often erroneus assumptions. it is a ride that sits at rest and then it catapults you with a fast initial velocity straight up and then it lets you...
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    Two dimensional physics problem

    i am kinda confused. this is my first quarter in physics and i seem to confuse the moment before collision and the stationary component of the final velocity. i guess that is why i was enlisting the help of people that are far more superior in their understanding of physics then myself...
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    Two dimensional physics problem

    i figured that when the snowball made contact with the target it's velocity would be 0.
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    Two dimensional physics problem

    In a snowball fight 2 snowballs are thrown in the same direction, but one is thrown 70.0 degrees with respect to the horizontal and the other is thrown some arbitrary distance lower. they both are thrown with a speed of 25.0 m/s. At what angle should the one that is thrown lower be to arrive...
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    Answer check

    thanks... i was just checking because i suck at physics.[b(] i don't have any answers in the back of the book and our homework is worth almost a quarter of our grade. physics for scientists and engineers = hard. -andrew
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    Answer check

    Question: A man is jumping into a river that is 23.0m below a bridge. 1. how long does the jump last? answer: 2.17 seconds 2. how fast was the diver traveling upon impact with the water? answer: 21.2 m/s 3. If the speed of sound in air is 340 m/s, how long after the diver took off...
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    Volume and density problem

    thanks for the help. that was a total rookie mistake that i made. <------ is done with calculus, but cannot manipulate a simple equation.
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    Volume and density problem

    Here is the problem: An auditorium measures 40.0m X 20.0m X 12.0m. the density of the air is 1.20kg/m^3. a) what is the volume in cubic ft? b) the weight of the air in the room in pounds. for a) i have some big answer. 339020 ft^3. using V=l*w*h and then using basic dimensional...
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    Question for any engineers out there

    excellent call. i had the unfortunate experience of taking an introductory drawing for engineers course. all of that isometric, oblique, hidden lines, etc. is tougher then any class i have taken up to this point. i would rather take calculus any day.
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    Engineering students

    i had to take chem 151 which is basically; general inorganic chemistry. it was a pain in the ass. i got a 4.0 in linear algebra, a 3.6 in multivariable calculus, and a whopping 2.8 in chemistry. unfortunately i have to take one more quarter of inorganic for structural engineering.
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