Homework Help: physics please HELP !

Posted by emmiie on Monday, May 21, 2012 at 11:47pm.

can you please help me with this please. thank you.
A small mass m hangs at rest from a vertical rope of length l that is fixed to the ceiling. A force then pushes on the mass, perpendicular to the taut rope at all times, until the rope is oriented at an angle delta and the mass has been raised by a vertical distance h . Assume the force's F magnitude is adjusted so that the mass moves at constant speed along its curved trajectory. Find the work done by F during this process. [Hint: When the angle is increased by ddelta (in radians), the mass moves along an arc length (ds=lddetla

physics please HELP ! - ...., Tuesday, May 22, 2012 at 12:53am
Fx=F-mgsinθ=0
F=mgsinθ

WF=∫F*ds=∫Fcos0ldθ use θ=0 and θ=θ0
=mgl(1-cosθ)

h=l-lcosθ0

WF=mgl(1-cosθ0)
=mgh
physics please HELP ! - emmiie, Tuesday, May 22, 2012 at 1:31am
thank you !!!!!

Answer this Question

Related Questions

physics Q - can you please help me with this please. thank you. A small mass m ...
physics please please please please please - a block of mass 2.50 kg rests on a ...
physics - A mass of 5.6 kg lies at the top of a frictionless incline. It is ...
Physics please help - A small circular object with mass m and radius r has a ...
Physics. Please please help! - A charge Q = +4.5 uC is located at the origin and...
Physics Please HELP!!!!!!!!! - Two small pith balls, each of mass m = 11.2 g, ...
physics - Two small pith balls, each of mass m = 11.2 g, are suspended from the ...
Science - I need help with 2 questions please. 1.What are the three parts of the...
MATH - Harriet needs to ship a small vase. The box she will use has a volume of ...
Physics - How long would it take a fighter jet to accelerate from 0 to 250m/s ...

For Further Reading

First Name:
School Subject:
Answer: