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Homework Statement
A pendulum of length ##L=1.25m##.Its bob (which effectively has all the mass) has speed ##v_0## when the cord makes an angle ##θ_0=40.0^°## with the vertical.##(a)## What is the speed of the bob when it is in its low (est position If ##v_0=8.00m/s## ? What is the least value that ##v_0## can have If the pendulum is to swing down and then up ##(b)## to a horizontal position,and ##(c)## to a vertical position with the chord remaining straight ? ##(d)## Do the answers to parts ##(b)## and ##(c)## increase,decrease,or remain the same if ##θ_0## is increased by a few degrees ?
Homework Equations
##-ΔU=W##
##W=Δ(KE)##
The Attempt at a Solution
[/B]
I found the answer of (a) using -
##-ΔU=W##
##W=Δ(KE)##
it came ##v=8.35\frac m s##
I didnt understand (b) and part (c).so I stucked there...
Thanks