Posted by **Naso** on Tuesday, March 23, 2010 at 12:13pm.

A marble slides without friction in a vertical plane around the inside of a smooth, 21 cm-diameter horizontal pipe. The marble's speed at the bottom is 4.5 m/s this is fast enough so that the marble makes a complete loop, never losing contact with the pipe.What is its speed at the top?

- phy -
**bobpursley**, Tuesday, March 23, 2010 at 12:34pm
At the top, it needs to have centripetal acceleration of v^2/r>g

So is v^2/r greater than g?

Now its speed at the top is determined by the bottom speed minus losses to gravity.

speed at top^2 =speedbottom^2-2g*.21

so figure speed at top, and see if it is greater than required.

- phy -
**Anonymous**, Saturday, December 4, 2010 at 4:11pm
2.2

## Answer this Question

## Related Questions

- Physics - A marble rolls down an incline of 30 degrees. If the marble is ...
- physics - A 10g marble is spun so that it rolls at 150rpm around the inside of a...
- physics - A solid uniform marble and a block of ice, each with the same mass, ...
- physics - Consider a marble moving on a horizontal track with a speed of 10 ...
- physics - Consider a marble moving on a horizontal track with a speed of 10 ...
- math Help!!!! - You have 1 red marble, 1 blue marble, 1 yellow marble and 1 ...
- physics - A block lies on a smooth plane tilted at an angle è = 28.5° to the ...
- Physics - A cardboard carton weighing 165 newtons is resting on a marble floor. ...
- Math help! - A bag contains 9 blue marbles and 1 green marble. What is the ...
- AP Physics - A small solid marble of mass m and radius r will roll without ...

More Related Questions