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  1. J

    Need help Basic Physics question from a competitive test.

    Thank you. It was bugging me. It looks like a grade 11 question to me.
  2. J

    Need help Basic Physics question from a competitive test.

    Homework Statement Two bodies of masses M1& M2 resting on frictionless surface. Bodies touch each other without any friction. What will be the force between the bodies, If they are pushed from one end with force F and both are accelerating towards other end? Answer given is (M2 x F)/(M1+M2)...
  3. J

    Where does a body weigh lightest?

    This was not meant to be a trick question, I am sure.
  4. J

    Where does a body weigh lightest?

    Homework Statement Hot oil, Hot water, Cold Oil, Cold water Homework Equations Upthrust according to flotation principle The Attempt at a Solution It will weight lightest when Upthrust by the fluid is highest, which should be cold water. Answer given was " cold oil".
  5. J

    Help with this 9th grade motion problem

    Care to explain it a bit more? Which is the equation you are referring to? We are yet to learn law of conservation of energy.
  6. J

    Help with this 9th grade motion problem

    Help with this 9th grade "motion" problem Homework Statement 2 stones are thrown vertically upwards with initial velocities U1 & U2. Prove that heights recahed by them is in ration U1squared:U2squared. Homework Equations S=u+at u being initial velocity The Attempt at a Solution since a...
  7. J

    What are some examples of Newton's third (3rd) law?

    http://74.86.200.109/showthread.php?t=285296Earlier physicsforums thread.
  8. J

    Why does the moon orbit the Earth, and not the other way around?

    I am no expert, but I had the same question and researched the answer.:smile:
  9. J

    Why does the moon orbit the Earth, and not the other way around?

    The larger body has momentum (m*v) at the same speed, so it takes the trajectory closest the center of mass of the two body system (barycenter). Link center of mass of the two bodies is going to form that eliptical trajectory, the barycenter will be inside of the larger body. See...
  10. J

    Definition of The first law of motion

    O.K Thanks.
  11. J

    Definition of The first law of motion

    Second law describes satellite motion. Got it. So can we say, satellite motion cannot be described by first law. If not, why not? Please explain.
  12. J

    Definition of The first law of motion

    So, you cannot apply first law to a satellite oribiting earth, and which is already under influence of gravity?
  13. J

    Definition of The first law of motion

    I used circular to mean orbiting motion of planets around sun or moon around earth. Moon is in a circular motion w r to Earth( due to gravity). Now unless it is acted upon by an asteroid or similar object, will it not continue it's circular(orbiting) motion?
  14. J

    Definition of The first law of motion

    I get thet gravity makes moon orbit earth, else it would have gone in a straight line away from earth. Gravity has acted and moon is now orbiting earth. Even in this state of circular motion, the first law will be applicable( though motion is NOT in a straight line) 1)In the absence of...
  15. J

    Definition of The first law of motion

    Text book definition is "In the absence of forces, ("body") at rest will stay at rest, and a body moving at a constant velocity in a straight line continues doing so indefinitely". My thinking. Moon is orbiting Earth in a circular path, and not in a straight line. Still that motion follows...
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