Go Back   Physics Help Forum > High School and Pre-University Physics Help > Energy and Work

Energy and Work Energy and Work Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Jul 16th 2014, 01:44 PM   #1
Junior Member
 
Join Date: Jul 2014
Posts: 5
Smile A rubber-band slingshot shoots a 25 g stone. When answering 2a below, remember that

A rubber-band slingshot shoots a 25 g stone. When answering 2a below, remember that Ep = kx2 and, because F = kx, Ep = Fx, you will need to use the average force which is obtained by dividing the maximum force by two.

a.What is the initial speed of the stone if the rubber band is drawn back 0.15 m with a maximum force of 27 N?
laurelo123 is offline   Reply With Quote
Old Jul 16th 2014, 02:05 PM   #2
Physics Team
 
ChipB's Avatar
 
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,352
You've been given a technique to calculate the elastic potential energy of the stretched rubber band. Now apply conservation of energy - that potential energy is converted to kinetic energy of the stone when it's fired. You should already know that kinetic energy of a moving object is:

KE =(1/2)mv^2

Set KE=Ep and solve for v.
ChipB is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Energy and Work

Tags
answering, physics, physics 20, remember, rubberband, shoots, slingshot, stone, work and enery



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Force/pressure exerted from rubber band pryphnoq Kinematics and Dynamics 1 Feb 3rd 2011 12:37 PM
Advice on my Tennis Ball Launcher...That Shoots 90 Meters MMAiNNoVATor Kinematics and Dynamics 0 Oct 3rd 2010 12:50 AM
Rubber Band Problem spade94 Kinematics and Dynamics 2 May 12th 2009 08:10 AM
Pls help....just cant remember, but an easy problem related to ELECTRIC FIELD. Ess J Electricity and Magnetism 4 Aug 31st 2008 09:31 AM
please please help i dont remember how to do this!!!! physicsconfused1416 General Physics 2 Aug 29th 2008 07:34 AM


Facebook Twitter Google+ RSS Feed