# physics

A phonograph record of radius 6 cm and mass 15 g is rotating with an angular velocity of 33.33 rev/min. A Penny of mass 1 g suddenly falls on the record and lands at the radial distance of 4 cm from the record’s center. What is the angular velocity after the collision.

1. 👍 0
2. 👎 0
3. 👁 113
1. The turntable will not slow down if the power is on. A motor keeps it moving at 33.33 rpm. Records (LP) did not have 6 cm radius; it was 6 inches.

If the record player were "coasting" and under no power, you would still need to know the mass of the turntable platen under the record, if you want to predict final angular velocity.

They may want to to apply conservation of angular momentum, but this is a poor choice of problem for applying it.

1. 👍 0
2. 👎 0
posted by drwls

## Similar Questions

1. ### physics

A phonograph record of radius 6 cm and mass 15 g is rotating with an angular velocity of 33.33 rev/min. A Penny of mass 1 g suddenly falls on the record and lands at the radial distance of 4 cm from the record’s center. What is

asked by Ama on December 5, 2010
2. ### calculus

(Use the fact that the kinetic energy of a particle of mass "m" moving at a speed "v" is (1/2)m(v^2). Slice object into pieces in such a way that the velocity is approximately constant on each piece.) Q: Find the kinetic energy of

asked by mike on October 28, 2012
3. ### University of Liberia

find the linear speed of each point 2cm and 15cm from the axis of a phonograph record rotating at 33 and 1/3 rev/min

asked by Musa on December 27, 2015
4. ### physics

find the linear speed of each point 2cm and 15cm from the axis of phonograph record rotating at 33 an 1/3 rev/min

asked by Musa on December 27, 2015
5. ### Physics

How much energy is require to set a 0.304m phonograph record into rotation at 33.33 revolution per minute if the mass of the record is 0.11kg?

asked by Olushola on April 15, 2015
6. ### Physics

The pressure exerted by a phonograph needle on a record is surprisingly large. If the equivalent of 1.00 g is supported by a needle, the tip of which is a circle 0.200 mm in radius, what pressure is exerted on the record in N/m2?

asked by Justin on July 14, 2013
7. ### physics

A fly of mass .2 g sits 12 cm from the center of a phonograph record revolving 331.3 rpm. a)What is the magnitude of the centripetal force on the fly?b)What is the minimum value of the coefficient of static friction between the

asked by Jenna on November 9, 2015
8. ### physics

A bug rides on a phonograph record. In which direction does the change in velocity of the bug point? A. toward the center of the record B. tangent to the circular path C. away from the center of the record D. up I thought C.away

asked by anonymous on March 11, 2014
9. ### physics

A phonograph record has an initial angular speed of 37 rev/min. The record slows to 10rev/min in 1.3 s. What is the record’s average angular acceleration during this time interval

asked by Kara on February 27, 2011
10. ### physics

A circular disk of mass 0.2 kg and radius 24 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.4 rad/s. Find the new angular velocity of the

asked by joe on December 3, 2011

More Similar Questions