Recent content by MetalCut

  1. M

    Calculating Velocity and Displacement in a Skateboarding Physics Experiment

    Thanx man. I will do that.
  2. M

    Calculating Velocity and Displacement in a Skateboarding Physics Experiment

    Thanx man. I appreciate.
  3. M

    Calculating Velocity and Displacement in a Skateboarding Physics Experiment

    I just want to know if this is correct. The question is: A boy and a girl on a skateboard push each other away at 30N for 1.2 s The boys' mass is 45kg and the girl's mass is 40kg. Determine the velocity after they have stopped pushing each other? How far did the girl move while their...
  4. M

    Rotational Kinematics of Running

    Thanx a lot, i don't know how i could have made such a stupid mistake... Thanx
  5. M

    Rotational Kinematics of Running

    Hi I need some help. The question is: At the local swimming hole, a favourite trick is to run horizontally of a cliff that is 8.3m above the water. One diver runs off the edge of the cliff, tucks into a ball and rotates on the way down with an average angular speed of 1.6rev/s. Ignore air...
  6. M

    Uniform Circular Motion of centrifuge

    Thanx i think I've got it.
  7. M

    Uniform Circular Motion of centrifuge

    But i can get (v) also with v=(2)(pie)(r)\T So i still need T
  8. M

    Uniform Circular Motion of centrifuge

    So then that probably means that v2/r = (6,25x10 3)g And the circumference of the circle its rotating in is 0,314m or 31,4cm
  9. M

    Uniform Circular Motion of centrifuge

    The equation is a = v2/r. But what do they mean when they say the centripetal acceleration is 6.25x10 3 times as large as the acceleration due to gravity?
  10. M

    Uniform Circular Motion of centrifuge

    Hi there. I need some help with this question. Can anyone help me... A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Suppose the centripetal acceleration of the sample is 6.25 X 10[SIZE="3"]3 times as large as the acceleration due...
  11. M

    How Do You Calculate Molecules Per Unit Volume from Pressure and Temperature?

    Ok Thanx man.
  12. M

    How Do You Calculate Molecules Per Unit Volume from Pressure and Temperature?

    Ok but isn't N the number of molecules?
  13. M

    How Do You Calculate Molecules Per Unit Volume from Pressure and Temperature?

    Yeah, so I must determine the volume first before I can determine the number of molecules. Let me give you the question. Maybe you can point out what I am misssing. On the sunlit surface of Venus, the atmospheric pressure is 9.0 x 10 6Pa, and the temperature is 740K. On the Earth's surface...
  14. M

    How Do You Calculate Molecules Per Unit Volume from Pressure and Temperature?

    I know that one. But the volume is not given, so how can i get the N/V, the number of molecules per volume?
  15. M

    How Do You Calculate Molecules Per Unit Volume from Pressure and Temperature?

    Hi. Can someone maybe give me an equation to determine the number of molecules per unit volume (N/V) when the pressure(P) and the temperature(T) is given. The pressure is in PA and the temperature is in Kelvin. Thanx