Homework Help: Physics

Posted by Leah on Tuesday, November 17, 2009 at 6:23pm.

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
-

Physics - bobpursley, Tuesday, November 17, 2009 at 6:36pm
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(l-h)/l

make your drawing, and confirm that.
Physics - Leah, Tuesday, November 17, 2009 at 6:49pm
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.

Answer this Question

Related Questions

physics - A pendulum consists of an object of mass m = 1.2 kg swinging on a ...
physics - A simple pendulum consists of a ball of mass 5.39 kg hanging from a ...
physics - A pendulum consists of a mass m = 0.12 kg hanging from a flexible ...
PHYSICS - Two objects are connected by a massless string as shown in the figure ...
AP PHYSICS MECH. - A simple pendulum, consists of an object suspended by a ...
physics - a simple pendulum consists of a bob of mass 1.8 kg attached to a ...
Physics - An object of mass M = 1,114 g is free to move along a horizontal, ...
physics - A massless string runs around two massless, frictionless pulleys. An ...
Physics - A pendulum consists of a 2.6 kg stone swinging on a 4.5 m string of ...
Physics - Consider the conical pendulum, a mass on the end of a string, with the...

For Further Reading

First Name:
School Subject:
Answer: