physics - density

posted by .

A person got a metal rock, he knows this rock density is ρm, but he is worried that there might be a hole within the rock, how he found there is a hole or not? And how he found the fraction of the hole size to total rock size? write your experimental steps.

  • physics - density -

    If ñm is the density of the rock with no holes, it can be compared to the actual density of the sample. Measure the volume of the rock, V and its mass, M.

    V*ñm - M = missing mass due to hole(s)
    = m

    m/ñm = v = volume of hole(s)
    v/V = fraction of sample that is holes
    = (1/V)[m/ñm]
    = (1/V)(V*ñm - M)/ñm
    = 1 - [M/(V*ñm)]

  • physics - density -

    how do fish use density in their lives?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A rock is tossed straight up with a velocity of 37.1 m/s. When it returns, it falls into a hole 18.8 m deep. What is the rock's velocity as it hits the bottom of the hole?
  2. physics

    A rock is tossed straight up with a velocity of 37.1 m/s. When it returns, it falls into a hole 18.8 m deep. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
  3. Physics

    A rock is tossed straight up with a velocity of 32.1 m/s. When it returns, it falls into a hole 20.1 m deep. What is the rock's velocity as it hits the bottom of the hole?
  4. Physics

    A rock is tossed straight up with a velocity of 33.9 m/s. When it returns, it falls into a hole 11.9 m deep. What is the rock's velocity as it hits the bottom of the hole?
  5. Physics

    A rock is tossed straight up with a velocity of 33.9 m/s. When it returns, it falls into a hole 11.9 m deep. What is the rock's velocity as it hits the bottom of the hole?
  6. physics

    A rock is tossed straight up with a velocity of 34.0 m/s. When it returns, it falls into a hole 17.3 m deep. What is the rock's velocity as it hits the bottom of the hole?
  7. math

    Landon is standing in a hole that is 6.7 ft deep. He throws a rock and it goes up into the air, out of the hole, and then lands on the ground above. the path of the rock can be modeled by the equation y= -0.005x^2 + 0.48x - 6.7, where …
  8. physics

    A rock is tossed straight up with a speed of 29m/s. When it returns, it falls into a hole 13m deep. Solve for rock's velocity as it hits the bottom of the hole. &How long is the rock in the air, from the instant it is released until …
  9. Math

    4. Landon is standing in a hole that is 6.5 ft deep. He throws a rock, and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = 0.005x² + 0.45x – 6.5, …
  10. Alg 1

    Landon is standing in a hole that is 6.5 ft deep. He throws a rock and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = -0.005x^2 + 0.45x - 6.5, where …

More Similar Questions