Thread: My physic questions.

  1. 01-20-2015 #1
    BlackDeath
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    My physic questions.

    1) If the mass of a system doesn’t change with time, then this system is a(n) ......... system. Fill in the blank. Isolated or closed ?

    2)     Which one of the following is wrong for the motion with constant velocity ?
    A) Acceleration is constant B)Average velocity is constant C) Instantaneous velocity is constant D)Acceleration is 0

    3) A 3.00 kg mass moves on a 30.0 degree frictionless inclined plane from at rest, then it slides about a distance negligible mass spring as shown in figure 7. After rhen the mass slides about 0.200 m further and stops b..... constant (k) of the spring is 400 N/m, find the distance (d) between the mass and the spring.

    4) My physic questions.-ekran-al-nt-s-jpg (-2.0J , 2.0J, 5.1J, -3.5J)find the work done by the force f

    Thanks a lot. I'cant solve these questions.
  2. 01-20-2015 #2
    Elkvis
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    We aren't a homework service. No one is just going to give you the answers. You need to show that you tried. This is also a computer programming forum. What makes you think you'll get answers to physics questions here?
    What can this strange device be?
    When I touch it, it gives forth a sound
    It's got wires that vibrate and give music
    What can this thing be that I found?
  3. 01-20-2015 #3
    BlackDeath
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    I'm sorry but please help me
  4. 01-20-2015 #4
    Elkvis
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    the first two questions can easily be answered by a query to google. Or possibly by reading your textbook. Or (in the case of #2) by using common sense.

    For 3 and 4, you have no option but to use the math you were taught in class. Nobody here will just give you the answers. Try it for yourself, and if you expect help from anyone here, you need to prove that you tried.

    What do you think the answers are?
    What can this strange device be?
    When I touch it, it gives forth a sound
    It's got wires that vibrate and give music
    What can this thing be that I found?
  5. 01-20-2015 #5
    BlackDeath
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    Elkvis. Thank you very much.
    In my opinion , answer of the first question is CLOSED system
    2)Acceleration is zero is it right?
    3) Answer is 2.0J
    4) I don't know
  6. 01-20-2015 #6
    Mario F.
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    Quote Originally Posted by BlackDeath View Post
    4) I don't know
    Playing on the cellphone during class, were we? Question 4 can only be answered by study. That's how you do it.

    Also...

    I love the dictionary of numbers chrome extension. This is how question 3 showed up in my browser:

    A 3.00 kg [≈ Newborn human baby] mass moves on a 30.0 degree frictionless inclined plane from at rest, then it slides about [...]
    Baby slide. Weee!
    Originally Posted by brewbuck:
    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
  7. 01-20-2015 #7
    BlackDeath
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    If you know, please help me. Mario F. I have an exam tomarrow
  8. 01-20-2015 #8
    Mario F.
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    Quote Originally Posted by BlackDeath View Post
    If you know, please help me. Mario F. I have an exam tomarrow
    You are barking at the wrong tree, son. I'm a school teacher too and I'm not particularly open to students who a) don't study, b) ask for homework to be done for them and c) think someone solving them a problem will help them learn anything.

    I don't know the answer to 4. I didn't care about doing the math. But here's an hint: There's plenty of places on the web that teach you about Work and Force. Question 4 is really easy. As soon as you understand the general formula for Work and study a bit about Newton's 2nd Law
    Originally Posted by brewbuck:
    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
  9. 01-20-2015 #9
    BlackDeath
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    I apologise you Mario.F. I respect you.

    You can say your answer is true or false. And How about question 2 ? I think mistake questions ?????
  10. 01-20-2015 #10
    Elkvis
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    Note that in question 2 it asks which is wrong.
    What can this strange device be?
    When I touch it, it gives forth a sound
    It's got wires that vibrate and give music
    What can this thing be that I found?
  11. 01-20-2015 #11
    BlackDeath
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    D)Acceleration is 0 ????????????????????????
  12. 01-20-2015 #12
    Elkvis
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    If you are moving with constant velocity, are you accelerating?
    What can this strange device be?
    When I touch it, it gives forth a sound
    It's got wires that vibrate and give music
    What can this thing be that I found?
  13. 01-20-2015 #13
    BlackDeath
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    Answer is accelariton is constant ???
  14. 01-20-2015 #14
    Elkvis
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    Quote Originally Posted by BlackDeath View Post
    Answer is accelariton is constant ???
    That is the best answer to the question, so that is what I would choose; however, all four answers apply equally well to an object with constant velocity. The acceleration is constant, even if it is zero.
    What can this strange device be?
    When I touch it, it gives forth a sound
    It's got wires that vibrate and give music
    What can this thing be that I found?
  15. 01-20-2015 #15
    BlackDeath
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    Elkvis thank you. Answer is Acceleration is constant . WHY ANSWER ACCELERATION IS CONSTANT ?
    Last edited by BlackDeath; 01-20-2015 at 11:24 AM.
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