Go Back   Physics Help Forum > High School and Pre-University Physics Help > Periodic and Circular Motion

Periodic and Circular Motion Periodic and Circular Motion Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Jun 22nd 2014, 09:03 AM   #1
Senior Member
 
Join Date: Jun 2014
Posts: 306
Number of oscillations executed by an object to be in phase?

the turntable is rotating at 36.25 rpm. the simple pendulum is performing SHM at 36.00 prm. how many complete oscillations would the pendulum execute so that both are in phase?
Attached Thumbnails
Number of oscillations executed by an object to be in phase?-dsc_0008.jpg  
ling233 is offline   Reply With Quote
Old Jun 22nd 2014, 07:01 PM   #2
Physics Team
 
ChipB's Avatar
 
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,347
What you want to determine is how long it takes the fast spinning turntable to complete one more cycle than the slower pendulum. Given that the rate of the turntable is 36.25 RPM, the number of rotations it make in T minutes is 36.25T. Meanwhile the slower pendulum has completed only 36T complete swings. For the faster turntable to "lap" the slower pendulum it must complete one extra cycle in that time T. So:

36.25T = 36T + 1.

Solve for T, and from that the number of cycles of the pendulum.
ChipB is offline   Reply With Quote
Old Jun 25th 2014, 02:29 AM   #3
Senior Member
 
Join Date: Jun 2014
Posts: 306
t=4 , what does it mean?
ling233 is offline   Reply With Quote
Old Jun 25th 2014, 04:35 AM   #4
Physics Team
 
ChipB's Avatar
 
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,347
It means that the two devices are back in sync at t=4 minutes. Now you need to figure out how many oscillations the pendulum makes in 4 minutes.
ChipB is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Periodic and Circular Motion

Tags
executed, number, object, oscillations, phase



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Weight of object = Force of buoyancy: can I use this when density of object is greatr jlyu002 Thermodynamics and Fluid Mechanics 2 Aug 13th 2014 06:44 AM
oscillations ling233 Periodic and Circular Motion 3 Jun 22nd 2014 10:31 AM
Oscillations Punch Periodic and Circular Motion 1 Nov 10th 2011 11:39 PM
Formula for oscillations jonbrutal Advanced Mechanics 3 Apr 2nd 2009 05:04 AM


Facebook Twitter Google+ RSS Feed