Physics
posted by Leah .
A pendulum consists of an object of mass m = 1 kg swinging on a massless string of length l = 258 cm. The object has a speed of 1.6 m/s when it passes through its lowest point. What is the greatest angle with the vertical that the string makes during the motion of the object?
So I tried doing this by calculating GPE = mgh
=25.3
So does this mean KE = 25.3?
However I don't even use the velocity at the lowest point, I am extremely confused...help =S


find the KE at the lowest point: 1/2 m v^2
Now, take that value,and set it equal to mgh
find h.
That is the height the bob goes up.
Now, angle= arccos(lh)/l
make your drawing, and confirm that. 
Yes I see what you're saying after drawing the diagram...So for the first bit we just use plain substitution of GPE formulas and second bit is trig.
=) thanks that seemed easier than i thought.
Respond to this Question
Similar Questions

Phys. pendulum
A pendulum consists of a mass of 3 kg tied to the end of a string of length 1.5 m. The pendulum is initially held at angle of 45o with the vertical and the pendulum is released. At the instant the mass passes through its lowest position … 
physics
A pendulum consists of an object of mass m = 1.2 kg swinging on a massless string of length l = 259 cm. The object has a speed of 2.4 m/s when it passes through its lowest point. What is the greatest angle with the vertical that the … 
AP PHYSICS MECH.
A simple pendulum, consists of an object suspended by a string. The object is assumed to be a particle. The string, with its top end fixed, has negligible mass and does not stretch. In the absence of air friction, the system oscillates … 
Physics
A pendulum consists of a massless rigid rod with a mass at one end. The other end is pivoted on a frictionless pivot so that it can turn through a complete circle. The pendulum is inverted, so the mass is directly above the pivot point, … 
physics
A pendulum consists of a massless rigid rod with a mass at one end. The other end is pivoted on a frictionless pivot so that it can turn through a complete circle. The pendulum is inverted, so the mass is directly above the pivot point, … 
Physics
A pendulum consists of a 2.6 kg stone swinging on a 4.5 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 53 ¢ª to the vertical? 
Physics
An object of mass 2 kg is attached to a string to form a pendulum. It is initially displaced to a height of 10 cm above the lowest point and let go. It hits another object of mass 1 kg at its lowest point. Given that the collision … 
Physics
A pendulum consists of a swinging mass hanging from a massless string. The hanging mass is 2.0 kg and the string is 400.0 cm long. If the mass has a speed of 8.0 m/s when it passes the lowest point of its swing, a) what is the speed … 
physics
A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.80 m. With the string hanging vertically, the object is given an initial velocity of 2.6 m/s parallel … 
Physics
A pendulum consists of a 2.1 kg stone swinging on a 3.6 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 60° to the vertical?