Change in gravitional potential energy at an angle?by flemj Tags: angle, energy, gravitional, potential 

#1
Nov408, 02:39 PM

P: 6

1. The problem statement, all variables and given/known data
A 0.23kg pendulum bob is attached to a string 1.2 long at an angle of 30 degrees. What is the change in the gravitational potential energy of the system as the bob swings from point A to point B U= 2. Relevant equations .5 mv^2 = mgl U=E+K 3. The attempt at a solution in the picture it looks like a string attached to a roof with the ball at rest touching the roof and swinging down to a position 35 degrees below im just not sure how you use the angle of 35 in the problem 



#2
Nov408, 02:42 PM

Emeritus
Sci Advisor
PF Gold
P: 9,789

Can you relate the change in angle to the change in height of the bob?




#3
Nov408, 02:45 PM

P: 6





#4
Nov408, 02:46 PM

Emeritus
Sci Advisor
PF Gold
P: 9,789

Change in gravitional potential energy at an angle? 



#5
Nov408, 02:51 PM

P: 6

im just really frustrated with this question 


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