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  1. S

    Last Minute Force Questions

    So the other force acting would be the weight? Which would be 5.4 N. Subtract that from the upward force? I'm confused....
  2. S

    Last Minute Force Questions

    Okay, so I use f=ma... F=.55*13 F=7.15 N That right? Now how should I start this?
  3. S

    Last Minute Force Questions

    Hey all. Sorry for asking so many questions about force, but these are tricky to me! Okay so I have 2 questions that I have started, but have yet to complete. Help would be greatly appreciated. 1. A model rocket weighs 5.4 N. a) What is its mass? b) What applied force makes it...
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    Force/Kinematics Problems

    Oh. That makes sense! Thanks so much for your help!
  5. S

    Force/Kinematics Problems

    Awesome. Thanks so much for the help! One last one possibly? A brick has a mass of 1.2 kg. A force of 5.4 N just begins to move the brick along the floor with a constant velocity. What is the coefficient of static friction? So I would use f=μn 5.4=μ*11.76 μ=0.46 Would that be right...
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    Force/Kinematics Problems

    And for the latter, F=ma F=75(-4) sumF= -300 Yay?
  7. S

    Force/Kinematics Problems

    So for #2 if I were to do: Vf=Vi+at 200=0+a6 200=6a a=33.33333 Then: F=ma F=5000(33.333) F= 166,667 N Right?
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    Force/Kinematics Problems

    Hey everyone. Struggling a little bit with a force test I have tomorrow. I've tried a few problems, and don't even know where to begin on another. I have the answers, and I would like to see if they are correct. Thank you so much! 1. An object of mass 70 kg is accelerated by a net force...
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    Is friction fμn?

    Hi, I am a bit confused with all this friction stuff... How would I begin to solve this problem and by using what formulas? Thanks. Suppose a 65-kg boy and a 45-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the accelleration of the girl toward the boy...
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    Fundamental Identities

    Homework Statement Okay, so this is some trig I learned last year but have since forgotten. If you can give me the first step, I can solve the rest on my own. The given statement is true and you have to prove why using Pythagorean Identities. csc2\alpha-1 = cos2\alpha ________ csc2\alpha
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    Kinematics Final Velocity Question

    Oh duh. Lol. Thanks... I don't process information well at night. Haha. Thanks for the help, I really appreciate it. G'night to ya!
  12. S

    Kinematics Final Velocity Question

    What is the direction of the velocity? Well I guess it doesn't really matter as long as its constant... i/e, you could call acceleration +9.8 as long as Vi was -2.0... Is that what you mean?
  13. S

    Kinematics Final Velocity Question

    Sweet, so technically, since that is "gravity" withheld, the acceleration would be -9.8?
  14. S

    Kinematics Final Velocity Question

    One more question if you can help: You throw a ball downward from a window at a speed of 2.0 ms. How fast will it be moving when it hits the sidewalk 2.5m below? Simple enough right? So my question is.... is it the initial velocity or final velocity that is 2.0? Wouldn't it be initial...
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    Kinematics Final Velocity Question

    Excuse me. It's 68. Great, thank you so much for your help.
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    Kinematics Final Velocity Question

    Okay, so to find acceleration, I used Vf=Vi+at Setting the Vf as 88 and the Vi as 68. Algebraically solving the equation, I found the acceleration to be 1.67. I then plugged into Vf2=Vi2+2ad Getting my result, 934.13 meters. Is this correct?
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    Kinematics Final Velocity Question

    Hi all. New to the forums. Rookie to Physics. I know this is a really simple question, but I am struggling with it. Help would be greatly appreciated. Q: Determine the displacement of a plane that experiences uniform acceleration from 66 m/s to 88 m/s in 12s. Wouldn't I use...
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